Structural Evolution of BaVS₃ Under Pressure
Abstract
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.
Recommended Citation
A. B. Garg et al., "Structural Evolution of BaVS₃ Under Pressure," Zeitschrift fur Naturforschung - Section B Journal of Chemical Sciences, vol. 63, no. 6, pp. 661 - 667, Verlag der Zeitschrift fur Naturforschung, Jun 2008.
Department(s)
Chemistry
Keywords and Phrases
High pressure; Low-dimensional materials; Phase transitions; Transport measurements; X-ray diffraction
International Standard Serial Number (ISSN)
0932-0776
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2008 Verlag der Zeitschrift fur Naturforschung, All rights reserved.
Publication Date
01 Jun 2008
