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Minerals 2015, 5(4), 647-653; doi:10.3390/min5040514

Pressure Induced Polymorphic Phase Transition of Natural Metamorphic Kalsilite; Electrical Resistivity and Infrared Spectroscopic Investigations

1
CSIR-National Geophysical Research Institute, Hyderabad 500007, India
2
School of Earth Sciences and Resources, China University of Geosciences (Beijing), 29 Xueyuan Road, Beijing 100083, China
3
Department of Earth Sciences, University of Adelaide, Adelaide, SA 5005, Australia
*
Author to whom correspondence should be addressed.
Academic Editor: Luca Bindi
Received: 26 June 2015 / Revised: 23 September 2015 / Accepted: 24 September 2015 / Published: 1 October 2015
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Abstract

We report here pressure dependence of the electrical resistivity of natural kalsilite (K0.998Na0.002Al0.998Fe0.002SiO4) from a granulite facies terrain in southern India. The electrical resistivity of kalsilite was measured with four probe technique up to 7.5 GPa at room temperature. The electrical resistivity decreases continuously with the increase of pressure up to 3.7 GPa, where there is a discontinuous drop in the electrical resistivity by 14%–16% indicating a first order transition. Further increase of pressure does not induce any phase transition up to 7.5 GPa at room temperature. Fourier transform infrared (FTIR) spectroscopy of the kalsilite sample at various pressures indicates that the observed transition is reversible in nature. View Full-Text
Keywords: kalsilite; high-pressure; phase transitions; FTIR spectroscopy; metamorphism; potassium aluminum silicates; ceramics; framework structure; feldspathoids kalsilite; high-pressure; phase transitions; FTIR spectroscopy; metamorphism; potassium aluminum silicates; ceramics; framework structure; feldspathoids
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Parthasarathy, G.; Santosh, M. Pressure Induced Polymorphic Phase Transition of Natural Metamorphic Kalsilite; Electrical Resistivity and Infrared Spectroscopic Investigations. Minerals 2015, 5, 647-653.

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