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Your search keyword '"Surampalli, Akash"' showing total 2 results
Start Over Author "Surampalli, Akash" Topic barium titanate
2 results on '"Surampalli, Akash"'

1. Electrocaloric effect in Sn substituted BaTiO3 ceramics: covering a broad temperature range.

Author

Surampalli, Akash, Prajapat, Deepak, and Reddy, V. Raghavendra

Subjects
*PYROELECTRICITY, *MAXWELL equations, *DIELECTRIC polarization, *TIN, *ELECTRIC fields, *TEMPERATURE
Abstract

The present work deals with the calculation of electrocaloric (EC) coefficients of BaTi1-xSnxO3 (x = 0.15, 0.20, 0.30) polycrystalline ceramics. Dielectric and polarization studies are carried out in a temperature range of 100 − 300 K to calculate the EC coefficients employing the indirect method based on Maxwell's equations. It is demonstrated that the EC effect is enhanced near the dielectric maxima for all the samples, including that of samples which exhibit relaxor behavior (x = 0.30). Furthermore, the maximum change in temperature, the temperature at which the maximum EC coefficient is achieved and the working range for EC effect are shown to be tunable with electric field and Sn substitution. [ABSTRACT FROM AUTHOR]

Published
2022
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2. Evidence of structural modifications in the region around the broad dielectric maxima in the 30% Sn-doped barium titanate relaxor

Author

Anil K. Sinha, Vasant Sathe, Giuliana Aquilanti, Carlo Meneghini, Pietro Corsi, V. Raghavendra Reddy, Akash Surampalli, Archna Sagdeo, Edmund Welter, Irene Schiesaro, Surampalli, Akash, Schiesaro, Irene, Corsi, Pietro, Meneghini, Carlo, Sathe, V. G., Sagdeo, Archna, Sinha, A. K., Aquilanti, Giuliana, Welter, Edmund, and Reddy, V. Raghavendra

Subjects
Phase transition, Materials science, Condensed matter physics, Lattice (group), 02 engineering and technology, Dielectric, Atmospheric temperature range, 021001 nanoscience & nanotechnology, 01 natural sciences, chemistry.chemical_compound, symbols.namesake, Condensed Matter::Materials Science, Negative thermal expansion, chemistry, 0103 physical sciences, Barium titanate, symbols, ddc:530, Absorption (logic), 010306 general physics, 0210 nano-technology, Raman spectroscopy
Abstract

Physical review / B covering condensed matter and materials physics 100(13), 134104 (2019). doi:10.1103/PhysRevB.100.134104, The structural and dielectric characterization of 30% Sn-doped BaTiO3 (BaSn0.3Ti0.7O3) as a function of temperature is carried out combining, complementary probes to reveal structural modifications associated to the relaxor behavior. Dielectric data confirms the existence of relaxor-type behavior in BaSn0.3Ti0.7O3. The local and average structural changes as a function of temperature have been investigated in the region of broad changes of dielectric response. Local probes, such as x-ray absorption fine structure spectroscopy and Mössbauer spectroscopy reveal a special trend of the lattice related to the diffuse dielectric phase transition as observed from dielectric data. The analysis of Raman spectra as a function of temperature reveals a peculiar behavior in the temperature region corresponding to the dielectric transition. The analysis of x-ray diffraction patterns points out a pseudocubic structure throughout the temperature range while the volume exhibits a negative thermal expansion in the region of broad dielectric maximum. Our results suggest structural modifications occurring in the system throughout a wide temperature range, interestingly, associated with changes in macroscopic properties of relaxors such as dispersion in dielectric constants and raising of dipole moments, Published by Inst., Woodbury, NY

Published
2019
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