Thermal expansion of plagioclase feldspars |
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Authors: | M Tribaudino R J Angel F Cámara F Nestola D Pasqual I Margiolaki |
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Institution: | 1. Dipartimento di Scienze della Terra, Università di Parma, Viale G.P. Usberti 157/A, 43100, Parma, Italy 2. Department of Geosciences, Virginia Polytechnic Institute and State University, Blacksburg, VA, 24061, USA 3. CNR-Istituto di Geoscienze e Georisorse, U.O.S. Pavia, via Ferrata 1, 27100, Pavia, Italy 4. Dipartimento di Geoscienze, Università di Padova, Via Giotto 1, 35137, Padua, Italy 5. European Synchrotron Radiation Facility (ESRF), B.P. 220, 38043, Grenoble, France
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Abstract: | The volume thermal expansion coefficient and the anisotropy of thermal expansion were determined for nine natural feldspars
with compositions, in terms of albite (NaAlSi3O8, Ab) and anorthite (CaAl2Si2O8, An), of Ab100, An27Ab73, An35Ab65, An46Ab54, An60Ab40, An78Ab22, An89Ab11, An96Ab4 and An100 by high resolution powder diffraction with a synchrotron radiation source. Unit-cell parameters were determined from 124
powder patterns of each sample, collected over the temperature range 298–935 K. The volume thermal expansion coefficient of
the samples determined by a linear fit of V/V
0 = α(T − T
0) varies with composition (X
An in mol %) as:
aV = 2.90( 4 ) ×10 - 5 - 3.0( 2 ) ×10 - 7 *X\textAn + 1.8( 2 ) ×10 - 9 *X\textAn2 \alpha_{V} = 2.90\left( 4 \right) \times 10^{ - 5} - 3.0\left( 2 \right) \times 10^{ - 7} *X_{\text{An}} + 1.8\left( 2 \right) \times 10^{ - 9} *X_{\text{An}}^{2} |
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Keywords: | |
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