Pressure Induced Polymorphic Phase Transition of Natural Metamorphic Kalsilite; Electrical Resistivity and Infrared Spectroscopic Investigations
| Autor: | M. Santosh, G. Parthasarathy |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
Phase transition
framework structure high-pressure lcsh:QE351-399.2 Infrared Analytical chemistry Mineralogy kalsilite engineering.material ceramics stomatognathic system feldspathoids Electrical resistivity and conductivity potassium aluminum silicates Ceramic Fourier transform infrared spectroscopy Spectroscopy lcsh:Mineralogy Geology Geotechnical Engineering and Engineering Geology Granulite phase transitions FTIR spectroscopy Kalsilite metamorphism visual_art engineering visual_art.visual_art_medium |
| Zdroj: | Minerals, Vol 5, Iss 4, Pp 647-653 (2015) Minerals; Volume 5; Issue 4; Pages: 647-653 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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