Spontaneous strain below the(Iar 1 - Par 1)transition in anorthite at pressure
โ Scribed by R. J. Angel; S. A. T. Redfern; N. L. Ross
- Publisher
- Springer-Verlag
- Year
- 1989
- Tongue
- English
- Weight
- 574 KB
- Volume
- 16
- Category
- Article
- ISSN
- 0342-1791
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๐ SIMILAR VOLUMES
We present 29Si MAS NMR data for a well-ordered natural anorthite, obtained in situ at temperatures of from 25 to 500 ~ C, which follow the changes in the aluminosilicate framework through the PI-I1 structural phase transition. Pairs of peaks due to sites offset by ap-I [111] converge through the Pi
The influence of A1/Si disorder in the anorthite tetrahedral framework upon the I1-P1 displacive transition of that framework has been investigted at high-temperatme by powder X-ray diffraction. The temperaturedependence of the order parameter in a heat-treated (disordered) anorthite and a Ca-rich p