Structural Evolution of BaVS3 Under Pressure

Autor:	V. Vijayakumar, Hans D. Hochheimer, Alka B. Garg, Amitava Choudhury
Rok vydání:	2008
Předmět:	Diffraction Bulk modulus Phase transition Equation of state Electrical resistance and conductance Condensed matter physics Chemistry X-ray crystallography General Chemistry Thermal conduction Ion
Zdroj:	Zeitschrift für Naturforschung B. 63:661-667
ISSN:	1865-7117 0932-0776
Popis:	Results of a high-pressure angle dispersive X-ray diffraction and electrical resistance study on quasi one-dimensional BaVS3 are reported. They show that no structural transition occurs up to 26 GPa. However, there is evidence of gradual disordering indicated by the broadening of the diffraction lines. p-V data fitted to a Birch-Murnaghan equation of state yields a value of the room-temperature, ambient-pressure bulk modulus of 77.3 GPa with a pressure derivative of 4.03. It is proposed that under compression structural phase transitions resulting from static displacements of V ions that are observed at low temperature are suppressed. Instead, a partial “polymerization” of V ions that is dynamic in nature and allows enhanced hopping conduction, starts near 3 GPa and saturates above 15 GPa.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::46a59675f41c4b06cee12e100e141e07 https://doi.org/10.1515/znb-2008-0611 Zobrazit plný text záznamu