Recovery of harmonic-like behavior of the polar mode in BaTiO3 at high pressures

Autor:	A. Herlihy, T. A. Bird, C. J. Ridley, C. L. Bull, N. P. Funnell, M. S. Senn
Jazyk:	angličtina
Rok vydání:	2022
Předmět:	Condensed Matter::Materials Science Condensed Matter - Materials Science Materials Science (cond-mat.mtrl-sci) FOS: Physical sciences QD
ISSN:	1098-0121
Popis:	The local structure of high pressure BaTiO$_3$ has been interrogated by neutron total scattering methods, up to pressures of 4.18 GPa at ambient temperature. Competitive refinements of cubic, tetragonal and rhombohedral distortion modes against pair distribution functions indicate contrasting local structure behaviour of temperature- and pressure-induced cubic BaTiO$_3$. Suppression of the mode amplitude, isotropy of the order parameter direction and loss of sensitivity to correlated Ti displacements at high pressure all suggest a high-pressure local structure that is more consistent with the harmonic approximation, rather than an order-disorder model which better describes high-temperature cubic BaTiO$_3$ in the vicinity of the tetragonal phase transition. 7 pages, 4 figures
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9f860828206862d8f8161b0291289218 http://wrap.warwick.ac.uk/165308/1/WRAP-Recovery-of-harmonic-like-behavior-of-the-polar-mode-in-BaTiO3-at-high-pressures-Herlihy-22.pdf Zobrazit plný text záznamu