Effect of pressure on reversible solid-solid transitions in nepheline and carnegieite
- 1 March 1976
- journal article
- Published by Mineralogical Society in Mineralogical Magazine
- Vol. 40 (313) , 487-492
- https://doi.org/10.1180/minmag.1976.040.313.08
Abstract
Differential thermal analysis of a rapidly reversible transition in carnegieite to 7 kbar shows the transition temperature increases from ⪝ 707°C (on heating) at I bar with initial slope ≈ 8·0 deg kbar−1 and anomalous curvature (d2T/dp2 > o), with hysteresis between heating and cooling signals that decreases with pressure. DTA of rapidly reversible transitions in nepheline shows the very subtle transition near 185°C (on heating) at 1 bar decreases with pressure to ≈ 170°C near 2-3 kbar and hardly varies in temperature up to 6 kbar; and the higher temperature transition increases from ≈ 872°C (on heating) at 1 bar with slope ≈ 25 deg kbar−1, to 5 kbar, with the hysteretic interval remaining essentially unchanged in the investigated range.Keywords
This publication has 1 reference indexed in Scilit:
- Nepheline solid solutionsMineralogical Magazine and Journal of the Mineralogical Society, 1959