RAMAN-SCATTERING OBSERVATION OF THE RUTILE-TO-CACL2 PHASE-TRANSITION IN RUO2

Authors
ROSENBLUM SS WEBER WH CHAMBERLAND BL
Citation
Ss. Rosenblum et al., RAMAN-SCATTERING OBSERVATION OF THE RUTILE-TO-CACL2 PHASE-TRANSITION IN RUO2, Physical review. B, Condensed matter, 56(2), 1997, pp. 529-533
Citations number
34
Categorie Soggetti
Physics, Condensed Matter
Journal title
Physical review. B, Condensed matter → ACNP
ISSN journal
01631829
Volume
56
Issue
2
Year of publication
1997
Pages
529 - 533
Database
ISI
SICI code
0163-1829(1997)56:2<529:ROOTRP>2.0.ZU;2-F
Abstract
Using a diamond-anvil cell, we have probed the pressure-induced rutile -to-CaCl2 ferroelastic phase transition in RuO2 with Raman spectroscop y. The transition is marked by a splitting Of the degenerate E-g mode of the rutile phase into two nondegenerate components and by an abrupt change in the Gruneisen parameters for all the phonons. The behavior of this splitting shows good agreement with Landau's theory for a seco nd-order phase transition, application of which yields a transition pr essure of 11.8+/-0.3 GPa.