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Your search keyword '"Ekicibil, Ahmet"' showing total 377 results
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377 results on '"Ekicibil, Ahmet"'

13. Synergized photothermal therapy and magnetic field induced hyperthermia via bismuthene for lung cancer combinatorial treatment

Author

Yilmazer, Açelya, Eroglu, Zafer, Gurcan, Cansu, Gazzi, Arianna, Ekim, Okan, Sundu, Buse, Gokce, Cemile, Ceylan, Ahmet, Giro, Linda, Unal, Mehmet Altay, Arı, Fikret, Ekicibil, Ahmet, Ozgenç Çinar, Ozge, Ozturk, Berfin Ilayda, Besbinar, Omur, Ensoy, Mine, Cansaran-Duman, Demet, Delogu, Lucia Gemma, and Metin, Onder

Published
2023
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38. Study of magnetocaloric properties of small Bi-doped Pr0.55Ca0.05Ba0.40Mn1−xBixO3 manganites.

Author

Akça, Gönül, Kılıç Çetin, Selda, and Ekicibil, Ahmet

Abstract

Here, we investigated the magnetic and magnetocaloric (MC) properties of manganites labeled PrCaBaMnO and PrCaBaMnBiO, with compositions Pr0.55Ca0.05Ba0.40Mn1−xBixO3 (x = 0 and 0.02), respectively. The solid-state reaction method was used for sample preparation, and the structural properties were checked using X-ray diffraction (XRD). Temperature dependence of magnetization (M(T)) measurements was carried out in the range of 5–300 K under 100 Oe field to determine the transition temperature of the manganites. Magnetic entropy change ( - Δ S M ) values were computed from field-dependent magnetization (M(H)) measurements. For the 2 T magnetic field values, the - Δ S M max values for the PrCaBaMnO and PrCaBaMnBiO manganites are 3.15 and 2.86 Jkg-1K-1, respectively. Relative Cooling Power (RCP) values were calculated from the temperature dependence of - Δ S M (T) curves, resulting in 82.4 and 88.6 Jkg-1 for PrCaBaMnO and PrCaBaMnBiO, respectively. Banerjee’s criterion and Franco’s universal master curve confirmed that the transition type for the studied manganites is second order. [ABSTRACT FROM AUTHOR]

Published
2024
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39. Electronic and magnetic properties of boron substituted CuFeO2 delafossite oxide.

Author

Ezircan, Ali, Aslan, M. Selim, Miyazaki, Hidetoshi, Akyol, Mustafa, Ozkendir, O. Murat, Ekicibil, Ahmet, and Öztürk, Hakan

Subjects
MAGNETIC properties, MAGNETIC transitions, EXCHANGE interactions (Magnetism), MAGNETIC fields, BORON, BORON isotopes, MAGNETIZATION, EXTENDED X-ray absorption fine structure
Abstract

Synchrotron x-ray diffraction (SR-XRD) and X-ray absorption fine structure spectroscopy (XAFS) were used to investigate the crystal and electronic properties of boron-substituted CuFeO2 material at room temperature. Without boron substitution, the polycrystalline structures of the trigonal (rhombohedral) ' $R\bar{3}m$ R 3 ¯ m ' CuFeO2 (87.7%) and hexagonal 'P63/mmc' (12.3%), which were also present in each sample but in different proportions, were utilised to identify the base material. XRD patterns revealed that, beyond 10% boron substitution, the metal–oxygen bonds (Fe-O and Cu-O) weakened, resulting in the formation of new tetragonal 'I41/amd' CuFe2O4 crystals. Although the CuFeO2 structure was preserved, it is conceivable that the presence of other crystal structures could lead to the formation of new features. This state arose as a result of CuFe2O4 crystallization and the impact of boron activity on the surrounding oxygen structures. By measuring magnetisation at both swept temperatures (10–300 K) and applied magnetic fields (±30 kOe), the magnetic properties of the samples were investigated. In the 10–300 K temperature range, the polycrystalline samples exhibit a ferromagnetic property without a magnetic phase transition. This suggests that replacing B with Fe in CuFe1−xBxO2 does not influence the primary magnetic property of CuFeO2. The samples' saturation magnetisation (Ms) values gradually fall as the B substitution content increases with Fe. This is because there's a chance that the non-transition metal B in CuFe1−xBxO2 will boost antiferromagnetic superexchange Cu-O interactions while lowering the p-d exchange interaction. [ABSTRACT FROM AUTHOR]

Published
2024
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