Raman scattering study on ferroelectric (Ba0.32Sr0.68)2Nb2O7 ceramics

Hushur, Anwar; Akishige, Y.; Kojima, Seiji

doi:10.1016/j.mseb.2005.02.001

Cited by 6 publications

(1 citation statement)

References 19 publications

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“…This has been reported under atmospheric pressure and room temperature conditions for n = 4 Brandon–Megaw compounds. [ 34,38–42 ] We identify SLNO1 temperature and pressure phase transitions at T = 247°C ± 5°C and P = 6.74 ± 0.25 GPa, respectively. Both transitions seem to correspond to the IC ‐ to‐commensurate Cmc 2 1 transition.…”

Section: Discussionmentioning

confidence: 99%

Structural and Raman study of the thermoelectric solid solution Sr_1.9La_0.1Nb₂O₇

Ojeda-Galván

Rodríguez-Aranda

Rodrı́guez

et al. 2020

J Raman Spectroscopy

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Ceramic powder samples of the perovskite‐slab‐layered polycrystalline Sr1.9La0.1Nb2O7 (SLNO1) thermoelectric solid solution were prepared via solid‐state reaction. The Raman effect was studied as a function of temperature between 27°C and 400°C (at ambient pressure) and pressures up to 11.6 GPa (at room temperature). The atomic disorder introduced by the La atoms produced phonon lines that were broader than those of Sr2Nb2O7 (SNO). We detected a temperature‐induced phase transition at Ti−c = 247 ± 5°C (ambient pressure) and a pressure‐induced phase transition at Pi−c = 6.74 ± 0.25 GPa (room temperature), which correspond to the reported SNO incommensurate‐to‐commensurate phase transitions at 215°C (atmospheric pressure) and Pi−c = 6.54 ± 0.25 GPa (27°C), respectively. In this paper, the phenomenological and structural differences between SNO and SLNO1 are discussed based on density functional theory calculations of Sr2−xLaxNb2O7 (x = 0.0625 and 0.125) supercells.

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Section: Discussionmentioning

confidence: 99%