Lattice-Dynamical Study of the α- β Phase Transition of Quartz: Soft-Mode Behavior and Elastic Anomalies
Abstract
The mechanism of the α-β phase transition of quartz is investigated within the framework of a lattice-dynamical model using the pair-wise potential by Tsuneyuki et al. [Phys. Rev. Lett. 61, 869 (1988)]. The model well describes this effect and shows that the related phenomena (the soft-mode behavior and the negative Poisson ratios) can be mainly attributed to the sensitivity of the potential surface to volume extension.
- Publication:
-
Physical Review Letters
- Pub Date:
- March 1997
- DOI:
- 10.1103/PhysRevLett.78.2413
- Bibcode:
- 1997PhRvL..78.2413S