Order and disorder in structural phase transitions

Autor:	Bruce Ravel, B. Rechav, N. Sicron, Yizhak Yacoby, John J. Rehr, Edward A. Stern
Rok vydání:	1995
Předmět:	Crystal Structural phase Materials science Order (biology) Condensed matter physics Order and disorder Electrical and Electronic Engineering Type (model theory) Condensed Matter Physics Ferroelectricity Local structure Electronic Optical and Magnetic Materials X-ray absorption fine structure
Zdroj:	Physica B: Condensed Matter. :259-262
ISSN:	0921-4526
DOI:	10.1016/0921-4526(94)00842-j
Popis:	Fundamental aspects of structural phase transitions are discussed in view of XAFS measurements of the local structure below and above Tc. The experimental results show that the local structure and the order parameter have very different temperature dependencies. In particular, while the order parameter is zero above Tc the local structure remains distorted hundreds of degrees above the transition. This means that the local crystal distortions are disordered above Tc and partially disordered below it. This behavior has been observed in pure and mixed crystals and in ferroelectric as well as antiferrodistortive type crystals suggesting that it may be quite general.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::a5ca253f439eff956c70fa916196aa67 https://doi.org/10.1016/0921-4526(94)00842-j Zobrazit plný text záznamu Full Text from ScienceDirect