X-ray absorption fine-structure study of amorphous germanium under high pressure

Autor:	R. Ingalls, E.D. Crozier, J. Freund
Rok vydání:	1990
Předmět:	Bulk modulus Absorption spectroscopy Chemistry General Engineering Measuring instrument Analytical chemistry chemistry.chemical_element Germanium Physical and Theoretical Chemistry Spectroscopy Potential energy Copper X-ray absorption fine structure
Zdroj:	The Journal of Physical Chemistry. 94:1087-1090
ISSN:	1541-5740 0022-3654
Popis:	The X-ray absorption fine structure (XAFS) of amorphous germanium under pressures ranging from 0.0 to 8.9 GPa is investigated. Contrary to some reports from the literature we cannot find a transition to crystalline germanium at about 6 GPa. Analysis of the XAFS phases of amorphous germanium and copper, which is used as a pressure marker, allows calculation of the bulk modulus at zero pressure, B{sub O}, of the bonds (as opposed to the bulk modulus of the bulk material, containing voids) and its pressure derivative, B{sub O}{prime}. They are 97 {plus minus} 8 GPa and 6 {plus minus} 2, respectively. B{sub O} is 30% larger than in crystalline germanium. Fair agreement is obtained with the two- and three-body potential energy formalism of Stillinger and Weber (1985).
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::b926602e0c2f86201e63b8b8b57388e6 https://doi.org/10.1021/j100366a012 Zobrazit plný text záznamu