Pressure-dependent Raman scattering of polycrystalline KNb 1-x Ta x O 3 solid solutions

Pressure-dependent Raman scattering of polycrystalline KNb 1-x Ta x O 3 solid solutions

We report experimental and calculated Raman scattering investigations of KNb 1-x Ta x O 3 (x = 0.4, 0.5, 0.6) solid solutions as a function of hydrostatic pressure. The observed phase transitions sequence in the range from room pressure to 12 GPa is similar to the temperature-induced structural phas...

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Bibliographic Details
Published in:SN applied sciences Vol. 2; no. 11
Main Authors: Di Geronimo, E., Bornand, Veronique, Baranek, Ph, Papet, Ph
Format: Journal Article
Language:English
Published: Springer Verlag 01-11-2020
Subjects:
Condensed Matter
Materials Science
Physics
high pressure Raman spectroscopy
DFT
phase transitions
potassium niobate tantalite
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Summary:We report experimental and calculated Raman scattering investigations of KNb 1-x Ta x O 3 (x = 0.4, 0.5, 0.6) solid solutions as a function of hydrostatic pressure. The observed phase transitions sequence in the range from room pressure to 12 GPa is similar to the temperature-induced structural phase transformations: orthorhombic (ferroelectric) to tetragonal (ferroelectric) to cubic (paraelectric). Furthermore, it was observed that the domain of stability of ferroelectricity at high pressures increases with Nb-content. For the first time, some DFT calculations of theoretical Raman spectra are reported in order to support the experimental observations of pressure-induced phase transitions.
ISSN:2523-3963
2523-3971
DOI:10.1007/s42452-020-03673-3