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Structural Phase Transition in Uranium Arsenide and Telluride
Author(s) -
Jha P. K.,
Sanyal S. P.
Publication year - 1997
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/1521-3951(199703)200:1<13::aid-pssb13>3.0.co;2-u
Subject(s) - valence (chemistry) , phase transition , uranium , ion , chemistry , telluride , arsenide , high pressure , volume (thermodynamics) , crystallography , phase (matter) , materials science , thermodynamics , gallium arsenide , physics , metallurgy , optoelectronics , organic chemistry
We have studied the structural phase transition due to high pressure in UAs and UTe for the first time by using an interatomic potential approach based on rigid ion model formulation. The theoretically predicted phase transition pressure and other structural properties for these compounds agree reasonably well with the measured values. The relative volume change ( V / V 01 ) for both compounds show that it is for UTe twice that for UAs and hence confirms that there may be more f–d hybridization mixed valence states in UTe similar to mixed valence compounds, where there is volume reduction due to f–d hybridization. We did not observe any high pressure structural phase transition for other uranium compounds such as USb, US, USe etc. up to 100 GPa. The nature of the force constants at equilibrium and high pressure is discussed.