Search

The effects of sintering temperature (Ts) and chemical substitution on the structural and magnetic properties of manganite compounds L a 1 − x S r x M n 1 − y F e y O 3 (0.025 ≤ x ≤ 0.7 ; y = 0.01 , 0.15) are explored in a search to optimize their magnetocaloric properties around room temperature. A ferromagnetic (FM) to paramagnetic (PM) phase transition is observed at a Curie temperature Tc that can be controlled to approach room temperature by Sr and Fe substitution, but also by adjusting the sintering temperature Ts. Accordingly, the magnetic entropy change (− Δ S M ) quantifying the magnetocaloric effect (MCE) presents a peak at or close to Tc that shifts and broadens with both Sr and Fe doping and is further tuned with sintering temperature. Altogether, we show that it is possible to adjust the strength and dominance of the ferromagnetic coupling in these ceramics, but also using disorder as a tool to broaden and adjust the temperature range with a significant magnetic entropy change. [ABSTRACT FROM AUTHOR]

The effects of sintering temperature (Ts) and chemical substitution on the structural and magnetic properties of manganite compounds L a 1 − x S r x M n 1 − y F e y O 3 (0.025 ≤ x ≤ 0.7 ; y = 0.01 , 0.15) are explored in a search to optimize their magnetocaloric properties around room temperature. A ferromagnetic (FM) to paramagnetic (PM) phase transition is observed at a Curie temperature Tc that can be controlled to approach room temperature by Sr and Fe substitution, but also by adjusting the sintering temperature Ts. Accordingly, the magnetic entropy change (− Δ S M ) quantifying the magnetocaloric effect (MCE) presents a peak at or close to Tc that shifts and broadens with both Sr and Fe doping and is further tuned with sintering temperature. Altogether, we show that it is possible to adjust the strength and dominance of the ferromagnetic coupling in these ceramics, but also using disorder as a tool to broaden and adjust the temperature range with a significant magnetic entropy change. [ABSTRACT FROM AUTHOR]

In previous studies, we have reported that double perovskite La2NiMnO6 presents non-negligible potential for room temperature magnetocaloric tasks. With the aim of improving even further the cooling performances and the working temperature range of double perovskites, we report the magnetic and magnetocaloric properties of La2MnFeO6 and ALaMnFeO6 (A = Sr, Ba, and Ca) compounds. X-ray diffraction and Rietveld refinement show that La2MnFeO6 (LMFO) and CaLaMnFeO6 (CLMFO) samples crystallize in an orthorhombic structure with the P n m a space group. However, a rhombohedral structure with the R 3 ¯ C space group is obtained for BaLaMnFeO6 (BLMFO) and SrLaMnFeO6 (SLMFO) samples. Substituting La by Ba or Sr in LMFO leads to a clear increase of the Curie temperature (Tc) compared to LMFO from 150 K for BLMFO up to 350 K for SLMFO. Moreover, CLMFO shows the smallest Tc down to 70 K. Ferromagnetic-like behavior is observed for SLMFO and BLMFO, while CLMFO's magnetism resembles that of LMFO. A clear connection between the structural parameters and the magnetic properties of these doped LMFO samples is unveiled as the highest Tc and the largest magnetization are observed for SLMFO which also shows bond angles closest to 180° and the smallest bond lengths, thus optimizing the superexchange interaction. The partial substitution of Sr for La leads, in fact, to a significant magnetocaloric effect over a wide operating temperature range extending beyond 300 K. For some optimal growth conditions, its entropy change varies slowly over an unusually large temperature range, which is of clear interest from a practical point of view. [ABSTRACT FROM AUTHOR]

• Assessment of the Pr 0.6 Sr 0.4 MnO 3 real potential in magnetic cooling. • MFT calculations alongside AMR and magnetic simulations have been carried out. • Thermodynamic performances over the MCE theoretical limit zone are investigated. In this work, we report a detailed study of the thermodynamic performance of Pr 0.6 Sr 0.4 MnO 3 in a functional magnetic cooling system up to the theoretical limit of its magnetocaloric effect. For this purpose, a one-dimensional numerical model of the active magnetic regenerator (AMR) cycle is developed, while the required magnetocaloric properties of the oxide are calculated in the framework of mean field theory. The obtained results are deeply analyzed and then compared with the reference gadolinium metal. Particularly, it is revealed that using Pr 0.6 Sr 0.4 MnO 3 as refrigerant requires high magnetic fields to generate reasonable temperature spans for practical applications, as it was found that under a magnetic field of 8 T, the studied oxide can generate an AMR temperature span of 33 K. The thermodynamic efficiency was evaluated by directly considering the work arising from the magnetic forces between the Pr 0.6 Sr 0.4 MnO 3 regenerator and the magnetic field source, as the associated magnetic work is numerically calculated by using Altair Flux 3D software. From the obtained results, it was found that the coefficient of performance can be enhanced by a factor of two when balancing magnetic forces, despite of the moderate magnetocaloric effect shown by Pr 0.6 Sr 0.4 MnO 3 under the practical fields going from 1 to 2 T. Moreover, the hidden thermodynamic performances of this compound are also pointed out by investigating its magnetocaloric properties in the theoretical limit zone. In this way, our calculations unveil that it is possible to reach cold source temperatures under -22 °C even when using helium as heat transfer fluid. [ABSTRACT FROM AUTHOR]

The HoVO3 orthovanadate undergoes a large negative and conventional magnetocaloric effects around 4K and 15 K, respectively. The partly overlapping of the magnetic transition at 15K and the structural transition occurring at 40 K, as well as the large magnetization, give rise to a giant refrigerant capacity without hysteresis loss. For a magnetic field variation of 7 T, the refrigerant capacity is evaluated to be 620 J/kg, which is larger than that for any known RMnO3 manganite. These results should inspire and open new ways for the improvement of magnetocaloric properties of ABO3 type-oxides. [ABSTRACT FROM AUTHOR]

Combining multiple degrees of freedom in strongly correlated materials such as transition-metal oxides would lead to fascinating magnetic and magnetocaloric features. Herein, the strain effects are used to markedly tailor the magnetic and magnetocaloric properties of PrVO3 thin films. The selection of an appropriate thickness and substrate enables us to dramatically decrease the coercive magnetic field from 2.4 T previously observed in sintered PVO3 bulk to 0.05 T for compressive thin films making from the PrVO3 compound a nearly soft magnet. This is associated with a marked enhancement of the magnetic moment and the magnetocaloric effect that reaches unusual maximum values of roughly 4.86 μB and 56.8 J/kg K with the magnetic field change of 6 T applied in the sample plane in the cryogenic temperature range (3 K), respectively. This work strongly suggests that taking advantage of different degrees of freedom and the exploitation of multiple instabilities in a nanoscale regime is a promising strategy for unveiling unexpected phases accompanied by a large magnetocaloric effect in oxides. [ABSTRACT FROM AUTHOR]

Recently, a reversible and a giant rotating magnetocaloric effect has been pointed out in the multiferroic TbMn2O5 single crystal, opening the way for new designs of low-temperature magnetic cooling. In this paper, we report a preliminary theoretical work with the aim of enlarging our understanding on the electronic, magnetic and accordingly magnetocaloric features of the TbMn2O5 compound. Particularly, the TbMn2O5 magnetic anisotropy is analyzed in terms of X-ray magnetic circular dichroism (XMCD) and X-ray absorption spectroscopy (XAS) spectra. [ABSTRACT FROM AUTHOR]

In this paper, we report on the magnetic properties and magnetocaloric effect (MCE) in NaZn13-type LaFe11.2Co0.7Si1.1Cx (x=0.1 and 0.3) close to room temperature. The Landau theory as well as the temperature dependence of magnetization data revealed that LaFe11.2Co0.7Si1.1C0.1 and LaFe11.2Co0.7Si1.1C0.3 exhibit a second-order magnetic transition near their Curie temperature. We have calculated the magnetocaloric effect both in terms of isothermal entropy change and adiabatic temperature change using the magnetization and the direct measurements. Under an external field change from 0 to 5 T, -ΔS is 14.5 J/kg K (TC=290 K) and 8 J/kg K (TC=310 K) for x=0.1 and 0.3, respectively. The calculated refrigerant capacity for a field change in 0-5 T is about 305 and 286 J/kg K, for LaFe11.2Co0.7Si1.1C0.1 and LaFe11.2Co0.7Si1.1C0.3respectively, which is larger than that of some magnetocaloric materials with a first-order phase transition (Gd5Ge2Si2). ΔTad decreases with increasing C content. It was found to be about 1.5 for x=0.1 and 1.2 for x=0.3 under 1.48 T. [ABSTRACT FROM AUTHOR]

In this work, the magnetocaloric properties of (La 0.45 Nd 0.25 )Sr 0.3 MnO 3 (LNSMO)-based composites are studied. The structural, microstructural, magnetic and magnetocaloric properties of LNSMO and LNSMO/5CuO samples were investigated aiming to particularly clarify the secondary phase (CuO) role in driving the magnetocaloric behavior. The main phase LNSMO crystallizes in a rhombohedral R-3C (1 6 7) configuration. The XRD patterns of composite samples show both perovskite LNSMO and monoclinic Tenorite CuO structures. The microstructural analysis unveils that the CuO phase is mainly present in the grain boundaries and segregates region. On the other hand, it was found that the magnetocaloric effect could be significantly enhanced by adding a small amount of CuO (5% weight ratio). For a magnetic field changing from 0 to 1.5 T, the corresponding isothermal entropy change was found to be 2.55 J/kg K for the LNSMO/5CuO composite while it is only about 1.1 J/kg K for the mother material LNSMO. Our finding should inspire and open new ways for the enhancement of the magnetocaloric effect in manganites-based materials. [ABSTRACT FROM AUTHOR]

In this paper, we investigate the influence of the rare earth element (R) on the physical properties of RVO 3 (R = Er, Ho, Y, Lu). For this purpose, a theoretical work is reported in this study using ab initio method with the intent of enhancing our knowledge of the electronic, and magnetic properties of RVO 3 (R = Er, Ho, Y, Lu) compounds. The electronic properties of these materials show the presence of Jahn-Teller effect, with a band gap of approximately 0.58eV, 1.57eV, 1.12eV, 1.28eV, for ErVO 3 , HoVO 3 , YVO 3 , LuVO 3 , respectively. The magnetic contribution of Ho, Er, and V atoms in HoVO 3 , and ErVO 3 compounds was disentangled using X-ray magnetic circular dichroism (XMCD). The magnetic anisotropies of RVO 3 with (R = Er, Ho, Y, Lu) are studied and analyzed using spin orbit coupling. We noticed an easy axis of magnetization along the c-direction with strong magneto-crystalline anisotropy energies for the non-magnetic rare earth elements (R = Lu, Y)VO 3. For the magnetic rare earth elements, the easy and hard magnetization direction were found to be along b-axis and c-axis, and a-axis and c-axis for HoVO 3 , and ErVO 3, respectively. This means that instead of the standard magnetization demagnetization process, large thermal effects can be obtained by spinning their single crystals in constant magnetic fields. The exchange coupling between (Ho–V) is also found to be greater than the other exchange interactions in HoVO 3. Accordingly, a large conventional magnetocaloric could be created in HoVO 3 , since the Ho Ising moments experience a metamagnetic transition. However, the magnetocaloric effect (MCE) is expected to be lower in ErVO 3 due to the weak (Er–V) exchange coupling. • Structural, electronic, and magnetic properties of RVO 3 (R = Er, Ho, Y, Lu) are investigated by DFT calculations. • Strong magnetocrystalline anisotropy is pointed out in RVO 3 (R = Er, Ho, Y, Lu). • Large rotating magnetocaloric effects are expected in RVO 3 (R = Er, Ho, Y, Lu). • The (Ho–V) exchange coupling is found to be much larger than the (Er–V) interplay. • The magnetocaloric effect is expected to be less pronounced in ErVO 3 than HoVO 3. [ABSTRACT FROM AUTHOR]

A large magnetocaloric effect can be obtained around T N, Dy ̴8 K simply by spinning the orthorhombic DyMnO 3 single crystal within the cb -plane in a constant magnetic field, instead of the standard magnetization–demagnetization process. Under 7 T, the maximum rotating entropy change (−Δ S R, cb ) and the associated adiabatic temperature change (Δ T ad, cb ) are 16.3 J/kg K and 11 K, respectively. The corresponding refrigerant capacity is 440 J/kg, with no thermal and field hysteresis losses. Our findings show that the orthorhombic DyMnO 3 could be used as a good refrigerant in more compact and efficient cryomagnetocaloric refrigerators. [ABSTRACT FROM AUTHOR]

In conventional magnetocaloric refrigeration systems, the magnetocaloric effect is exploited by moving the active material in and out of the magnetic field source. Here, we demonstrate that a large and reversible magnetocaloric effect (-ΔSR, max = 6.4 J/kg K and ΔTR, max = 8K under 2 T) can be generated simply by rotating the multiferroic TbMn2O5 single crystal around its b axis in a relatively low constant magnetic field applied in the ac plane. Our results should inspire and open ways toward the implementation of compact, efficient and embedded magnetocaloric devices for low temperature and space applications. [ABSTRACT FROM AUTHOR]

In this work, we report a detailed experimental study regarding the impact of copper oxide (CuO) secondary phase and heat treatments on the structural, magnetic, and magnetocaloric properties of the near-room temperature Pr 2∕3 Sr 1∕3 MnO 3 (PSMO) magnetic refrigerant. Our investigations are carried out by using structural and microstructural analyses, alongside magnetization measurements. The analysis of X-ray diffraction data of PSMO(95 %)-CuO(5 %) (PSMO-CuO) samples shows the coexistence of both CuO and PSMO phases. Further, the microstructural analysis of PSMO-CuO reveals that the addition of CuO significantly enhances the grains size. On the other hand, the added secondary phase markedly reduces the Curie temperature (T c) from 293 K for PSMO to about 273 K for PSMO-CuO composite while increasing the magnetocaloric effect. This decrease in T c is associated with a significant change from 162° to about 156° in the Mn-O II -Mn bond angle respectively. Moreover, performed investigations regarding the role of heat treatments unveil that the observed changes in the structural and magnetic features are mainly driven by the secondary phase that modify grains size and double-exchange interactions in the PSMO compound. Interestingly, our findings demonstrate that the Curie temperature of the PSMO and accordingly its magnetocaloric effect can be tailored by adding small amounts of CuO without need to substitution on cation sites. In the light of obtained results, a multilayered refrigerant composed of PSMO and PSMO-CuO is proposed to cover the magnetic cooling temperature range close to room-temperature. The resulting entropy change remains practically constant between 273 K and 293 K. Such a behavior is highly appreciated from a practical point of view, particularly in cases where the cooling process is carried out by using the AMR and Ericsson cycles. • The real impact of CuO secondary phase and heat treatment in tailoring the Pr 2∕3 Sr 1∕3 MnO 3 features is clarified. • The correlation between structural and magnetic ordering parameters in Pr 2∕3 Sr 1∕3 MnO 3 /CuO composite is deeply investigated. • An efficient room temperature multilayered magnetic refrigerant based on Pr 2∕3 Sr 1∕3 MnO 3 /CuO and Pr 2∕3 Sr 1∕3 MnO 3 is proposed. [ABSTRACT FROM AUTHOR]

Magnetic and magnetocaloric properties of the hexagonal HoMnO 3 single crystal have been revisited. It was found that the magnetocaloric effect shown by HoMnO 3 strongly depends on the crystal orientation in respect to the applied magnetic field. Consequently, a large thermal effect can be induced by spinning the single crystal HoMnO 3 around the a (or b ) axis in a constant magnetic field instead of the conventional magnetization–demagnetization process. Under 7 T, the maximum rotating entropy change was evaluated to be about 8 J/kg K. The associated adiabatic temperature change reaches a value of about 5 K. These values are comparable to those of the other oxides exhibiting a large rotating magnetocaloric effect. The presence of both conventional and rotating thermal effects makes the hexagonal HoMnO 3 more interesting from a practical point of view. [ABSTRACT FROM AUTHOR]

The magnetic properties and magnetocaloric performance of the multiferroic hexagonal single crystal DyMnO 3 have been explored. A giant anisotropic and reversible magnetocaloric effect (MCE) is observed in the vicinity of the magnetic phase transition from the ferrimagnetic to the antiferromagnetic state at 8 K. This latter was found to be of first-order character. The magnetocaloric effect was enhanced when a magnetic field higher than 1 T is applied along the hard plane, ab . Moreover, a significant level of the entropy change is observed at very low magnetic fields along the easy axis c, resulting from a field-induced metamagnetic transition around 8 K. Our estimate of the cooling capacity of the hexagonal DyMnO 3 is comparable or even larger than the best magnetocaloric materials in a similar working temperature range. [ABSTRACT FROM AUTHOR]

Magnetic and magnetocaloric properties of HoMn2O5 single crystals were investigated. HoMn2O5 undergoes a large conventional magnetocaloric effect around 10K. The magnetocaloric effect was found to present a giant anisotropy. Consequently, a large magnetocaloric effect (-ΔSR,max=12.43 J/kg K for 7 T) can be obtained simply by rotating the single crystal HoMn2O5 within the cb plane in constant magnetic field instead of moving it in and out of the magnetic field zone. This can open the way for the implementation of compact, simplified, and efficient rotary magnetic refrigerators. [ABSTRACT FROM AUTHOR]

Materials showing anisotropic magnetocaloric effects could open the way for new designs of magnetic cooling. In the paper by Jin et al. [Phys. Rev. B 83, 184431 (2011)], a rotating magnetocaloric effect was pointed out in TbMnO3 single crystals. The reported effect arises from the rotation of TbMnO3 crystals between their b and a axes. However, in this Comment we demonstrate that TbMnO3 crystals generate a rotating magnetocaloric effect that is at least two times larger than that reported by Jin et al. On the other hand, the newly reported rotating magnetocaloric effect is not directly resulted from the magnetocrystalline anisotropy, also being in contrast with Jin et al. data. [ABSTRACT FROM AUTHOR]

We report a detailed study of the magnetocaloric effect in heterostructures of La 2 NiMnO 6 and La 2/3 Sr 1/3 MnO 3. The shape, width and magnitude of the temperature dependence of the magnetic entropy change (Δ S m ) for these multilayer samples are affected by their layout with a clear impact from epitaxial strains on each layer. A large Δ S m over a wide temperature range which goes beyond room temperature is observed in all samples. We observe a temperature-independent table-top-like Δ S m over a temperature range as large as 100 K in the trilayer samples. La 2 NiMnO 6 double perovskite with multiple magnetic phase transitions sensitive to strain is the key to tuning and shaping the temperature dependence of the magnetic entropy changes to suit the requirements of several cooling cycles. • Epitaxial bilayer and trilayer samples of La 2 NiMnO 6 and La 2/3 Sr 1/3 MnO 3 were grown using pulsed laser deposition technique. • Structural and magnetic measurements have been performed to characterize the samples. • A large and almost temperature independent magnetocaloric effect was obtained extending from 175K up to above room temperature in the heterostructures. • Magnetic and magnetocaloric properties of the heterostructures were easily tuned and controlled by changing their layouts originating from the sensitivity of cationic ordering to strain in La 2 NiMnO 6. [ABSTRACT FROM AUTHOR]

A number of magnetic refrigeration prototypes have been developed in recent years. Nevertheless, their optimization remains a challenging process. This paper presents an efficient approach based on artificial intelligence for optimizing the cooling performance of multi-layer active magnetic regenerators. To this end, a validated numerical model was used to predict the temperature difference between the hot and cold sources of a four-layer active magnetic regenerator. By using a nanofluid as a heat transfer fluid, the maximum temperature span of the device can be increased by approximately 20%. More importantly, by simultaneously optimizing a set of 10 key parameters, including the geometric parameters and the working conditions, the thermodynamic performance of the four-layer active magnetic regenerator prototype can be markedly enhanced by almost 40%. The newly established approach will be of considerable practical importance to both scientists and engineers since it will enable them to avoid costly experimental trials by optimizing a wide number of parameters. • A validated numerical model of a multilayer active magnetic regenerator is developed. • Thermodynamic performance optimization using artificial intelligence is performed. • A set of 10 geometric parameters and working conditions are optimized. • An enhancement of roughly 20% in cooling performance is achieved using a nanofluid. • An optimal set of parameters yields a nearly 40% improvement in cooling performance. [ABSTRACT FROM AUTHOR]

Large rotating magnetocaloric effect (MCE) has been recently observed in HoMn 2 O 5 single crystals due to the strong magnetocrystalline anisotropy making a significant step towards efficient magnetic refrigeration systems. We tried to explain, theoretically, the reasons behind the magnificent performance in terms of magnetocaloric effect based on DFT calculations and Monte Carlo simulations. X-ray magnetic circular dichroism (XMCD) was performed in order to disentangle the magnetic contribution responsible for the MCE, as well as, the investigation of electronic and magnetic properties. The obtained results would enable the understanding of electronic and magnetic behaviors experimentally observed in HoMn 2 O 5 single crystals and the optimization of their MCE for magnetic refrigeration application. • Magnetic properties and magneto-caloric effect (MCE) in HoMn 2 O 5 single crystals were studied. • Large values of − Δ S M and RCP were observed at low temperature by Monte Carlo simulations. • The origin of MCE in Δ S M in HoMn 2 O 5 was discussed. • First principle study was performed to investigate the magnetic contribution and the anisotropy in HoMn 2 O 5. [ABSTRACT FROM AUTHOR]

Abstract In this work, we report a detailed theoretical study dealing with the magnetic and thermal features of the intermetallic compound AlFe 2 B 2 close to room temperature. The magnetocaloric properties in terms of both adiabatic temperature (ΔT ad) and magnetic entropy (ΔS mag) changes were determined using the Monte Carlo approach, while the thermodynamic performances were simulated according to the active magnetic refrigeration (AMR) model. Under a magnetic field changing from 0 to 5 T, the ΔS mag and ΔT ad reach maximum values of 7.75 J/kg K and 3.74 K close to 290 K, respectively, being in good agreement with previously reported experimental values. In contrast, the calculated relative cooling power (RCP) was found (480 J/kg) to largely exceed the reported experimental value in early works. On the other hand, the implementation of AlFe 2 B 2 as a refrigerant in a 1T-AMR device would enable to generate a maximum no-load temperature span of about 10 K and a maximum cooling power of 50 W for a low operating frequency of 0.5 Hz. These findings unveil that the relatively cheaper AlFe 2 B 2 compound and its derivatives could be a promising alternative to the rare earth-based alloys in magnetic refrigeration. Highlights • The magnetic and magnetocaloric properties of AlFe 2 B 2 structure have been investigated using Monte Carlo approach. • A 1D mathematical model of the magnetic refrigeration device has been developed. • Cooling characteristics of AlFe 2 B 2 were evaluated according to the active magnetic refrigeration (AMR) model. [ABSTRACT FROM AUTHOR]

• The impact of Mn 2 O 3 secondary phase on the morphology, and physical properties of La 0.6 Ca 0.4 MnO 3 material was investigated. • When Mn 2 O 3 is mixed with the La 0.6 Ca 0.4 MnO 3 compound, SEM micrographs show an increase in the grains size. • The Mn 2 O 3 addition has no impact on the Curie temperature of the composites. • For 20% of Mn 2 O 3 , the refrigerant capacity can be enhanced by more than 20% when compared to that shown by the mother compound. Perovskite manganite (1−x)La 0.6 Ca 0.4 MnO 3 /xMn 2 O 3 (x = 0, 0.05. 0.1, 0.15, 0.20) composites were prepared by solid state reaction method. X-ray diffraction measurements were used to confirm the crystal structure and the average crystallite size of the samples. Their magnetic, magnetocaloric and heat capacity properties display a presence of second order magnetic phase transition at 260 K. The maximum magnetic entropy change was found to be 5.33 J/kgK for x = 0.1 of Mn 2 O 3 under 5 T. The relative cooling power (RCP) was found (235 J/kg) to largely exceed that reported in early works for a similar family of materials. In addition, the RCP of the mother alloy is enhanced by more than 20% under 32 kOe without affecting the Curie temperature that remains approximately constant close to 260 K. Our results suggest that the addition of Mn 2 O 3 could be useful for the enhancement of the LCMO refrigerant capacity without affecting the Curie temperature. [ABSTRACT FROM AUTHOR]

• Production of (La 0.45 Nd 0.25)Sr 0.3 MnO 3 /0.05CuO by pilot scale spray drying method. • A new ways for the enhancement of the magnetocaloric effect in (La 0.45 Nd 0.25)Sr 0.3 MnO 3 /0.05CuO, based composite materials. • High magnetic entropy change (2. J/kg·K at 2 T) was observed in (La 0.45 Nd 0.25)Sr 0.3 MnO 3 /0.05CuO. This study presents an investigation of the structural, magnetic and magnetocaloric properties of the 0.95(La 0.45 Nd 0.25)Sr 0.3 MnO 3 /0.05CuO polycrystalline composite. The investigated composite materials are elaborated by combining both solid-state reaction and spray-drying method at the pilot-scale aiming to obtain a homogeneous composite material with controlled morphology and regular particles size. The structure, microstructure, magnetism and magnetocaloric features of the synthesized materials are investigated by using several techniques such as X-ray diffraction (XRD), scanning electron microscopy (SEM) and Magnetic measurements. The XRD and SEM data confirm the co-existence of perovskite and copper oxide phases. The magnetization data unveil that the studied composite exhibits a ferromagnetic to paramagnetic transition close to room-temperature (TC = 295 K). More importantly, its magnetocaloric effect in terms of the entropy change remains similar to that of (La 0.45 Nd 0.25)Sr 0.3 MnO 3 /0.05CuO only synthesized by the conventional solid-state reaction technique. This points out the possibility of upscaling the production of magnetocaloric oxides to industrial levels using the spray-drying technique. [ABSTRACT FROM AUTHOR]