Original paper

Athermal transformation behaviour and thermal hysteresis at the SiO2-α/ß-cristobalite phase transition

Schmahl, Wolfgang W.

European Journal of Mineralogy Volume 5 Number 2 (1993), p. 377 - 380

4 references

published: Apr 27, 1993
manuscript accepted: Dec 16, 1992
manuscript received: Nov 23, 1992

DOI: 10.1127/ejm/5/2/0377

BibTeX file

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Abstract

Abstract The α/ß-phase-transition of cristobalite (SiO2) shows a stable and reproducible hysteresis loop with phase coexistence on both slopes. The transition proceeds as a function of temperature rather than isothermally. The non-thermally-activated (athermal) behaviour is analogous to martensitic transformations in metals and alloys, and similar to the hysteresis of ferroics in an applied field. The observations suggest that self-pinning by coherency- strain is the cause of the 'thermal' hysteresis of non-quenchable structural phase transitions

Keywords

SiO2cristobalitephase transitionhysteresisnucleationcoherency strain