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41 results on '"Tiwari, Balgovind"'

8. Structural, micro-structural, resistive and capacitive characteristics of Mn modified lead zirconate titanate: Pb(Zr0.35–xMnxTi0.65)O3 (x = 0–0.10) ceramics.

Author

Tiwari, Balgovind, Babu, T., and Choudhary, R. N. P.

Subjects
*LEAD zirconate titanate, *FIELD emission electron microscopes, *TITANATES, *CERAMICS, *ELECTRIC impedance, *LEAD titanate, *RELAXATION phenomena, *X-ray diffraction
Abstract

In this paper, detailed studies of effect of small amount of manganese substitution (at the zirconium site) on the structural, micro-structural, and electrical characteristics of lead zirconate titanate of Pb(Zr0.35–xMnxTi0.65)O3;x = 0, 0.02, 0.06, 0.10 (PZMT)) have been reported. The materials were prepared by using standard ceramic technology. The formation of the compounds and their basic crystal data have been studied through X-ray diffraction (XRD) method. The crystallite size and lattice strain of the compounds, evaluated from Scherrer's and Hall Williamson (H-W) equations, is found to be in the range of 40–50 nm and 11 × 10−4 to 50 × 10−4, respectively. Microstructures of different magnifications, revealing the surface nature of the compounds, have been recorded by field emission scanning electron microscope (FESEM). Effect of Mn+4 ions on electrical behavior (electrical impedance (Z*), electrical modulus (M*), conduction and relaxation phenomenon) of PZMT systems, over wide range of temperature and frequency, has been studied. [ABSTRACT FROM AUTHOR]

Published
2024
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29. Dielectric characteristics of Pb(Zr0.52-xYxTi0.48)O3 (x = 0.00, 0.10 and Y = Mn/Ce) ferroelectric bulk ceramics.

Author

Tiwari, Balgovind, Babu, T., and Choudhary, R. N. P.

Subjects
*FERROELECTRIC ceramics, *LEAD zirconate titanate, *LEAD titanate, *DIELECTRICS, *PERMITTIVITY, *CURIE temperature
Abstract

Lead zirconate titanate (PZT) ceramics of morphotropical phase boundary (MPB) region possess prodigious physical properties such as high relative dielectric constant (ɛr), low relative tangent loss (tan δ), high Curie temperature (Tc), etc. In this work, the ferroelectric ceramics of chemical stoichiometry Pb(Zr0.52-xYxTi0.48)O3, x = 0.00, 0.10 and Y = Mn/Ce (PZ(M/C)T) have been synthesized using solid state synthesis. Results indicated that the PZ(M/C)T compounds exhibit the ferroelectric nature. The Tc values of PZT, PZMT and PZCT compounds are 375.17 °C, 272.25 °C and 373.05 °C respectively. Hence, with the substitution of Mn/Ce ions, the Tc of PZT has been reduced. Further, the loss of PZT has also been reduced due to the substitution of Mn/Ce ions at the zirconium site. Also reported in this paper is the quantitative diffusiveness of the compounds, calculated using Curie-Weiss expression. [ABSTRACT FROM AUTHOR]

Published
2020
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39. Study of Effect of Ce and Mn Substitution on Structural, Dielectric and Electrical Characteristics of Pb(Zr0.65Ti0.35)O3 Ceramics.

Author

Tiwari, Balgovind and Choudhary, R. N. P.

Subjects
*CERAMICS, *LEAD compounds, *CERIUM, *MANGANESE, *SUBSTITUTION reactions, *DIELECTRICS, *MICROSTRUCTURE
Abstract

The polycrystalline samples of Pb(Zr0.65-xAxTi0.35)O3 (A = Mn, Ce)(x = 0, 0.05) (PZM/CT) were prepared by a high-temperature solid-state reaction technique. Structural properties of the compounds were examined through X-ray diffraction (XRD) study and confirmed the formation of single-phase compounds at room temperature. Microstructural analysis of the surface of the compounds by scanning electron microscopy (SEM) suggests that there is a change in grain size and density due to introduction of Mn and Ce. Detailed studies of the dielectric properties reveal that both kinds of modifications induce a shift in Tc and improvement in dielectric constant. Nyquist plots shows that in both modifications the contribution of bulk is prominent towards resistivity of the materials. Conductivity (ac) also showed an improved in both modifications. [ABSTRACT FROM AUTHOR]

Published
2008
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41. Complex impedance spectroscopic analysis of Mn-modified Pb(Zr0.65Ti0.35)O3 electroceramics

Author

Tiwari, Balgovind and Choudhary, R.N.P.

Subjects
*RELAXATION for health, *INDUSTRIAL chemistry, *SPECTRUM analysis, *IMPEDANCE spectroscopy
Abstract

Abstract: The polycrystalline samples of Pb(Zr0.65− x Mn x Ti0.35)O3 (PZMT) (x=0, 0.05, 0.10, 0.15) were prepared by a high-temperature solid-state reaction technique. Detailed studies on the effect of compositional variation of manganese (Mn) on the electrical behavior (complex impedance Z*, complex modulus M*, electrical conductivity and relaxation mechanisms) of the PZMT systems have been carried out by a nondestructive complex impedance spectroscopy (CIS) technique at 400°C. The Nyquist plots suggest that the grains only are responsible in the conduction mechanism of the materials. The occurrence of single arc in the complex modulus spectrum of all the compositions of Mn confirms the single-phase characteristics of the PZMT compounds, and also confirms the presence of non-Debye type of multiple relaxation in the material. [Copyright &y& Elsevier]

Published
2008
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