Volume thermal expansion along the jadeite–diopside join

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• 作者：Francesco Pandolfo ; Fernando Cámara…
• 关键词：Jadeite ; Diopside ; Omphacite ; Thermal expansion ; High temperature ; Single ; crystal X ; ray diffraction
• 刊名：Physics and Chemistry of Minerals
• 出版年：2015
• 出版时间：January 2015
• 年：2015
• 卷：42
• 期：1
• 页码：1-14
• 全文大小：505 KB
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  3. Alvaro M, Nestola F, Cámara F, Domeneghetti MC, Tazzoli V (2011b) High-pressure displacive phase transition of a natural Mg-rich pigeonite. Phys Chem Minerals 38(5):379-85 CrossRef
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  11. Cámara F, Carpenter MA, Domeneghetti MC, Tazzoli V (2003) Coupling between non-convergent ordering and transition temperature in the / C2/ / c???em class="a-plus-plus">P2₁/ / c phase transition in pigeonite. Am Mineral 88(7):1115-128
  12. Cámara F, Gatta GD, Meven M, Pasqual D (2012) Thermal expansion and high temperature structure evolution of zoisite by single-crystal X-ray and neutron diffraction. Phys Chem Mineral 39(1):27-5 CrossRef
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• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Mineralogy
  Crystallography
  Geochemistry
  Mineral Resources
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-2021

文摘

An in situ single-crystal high-temperature X-ray diffraction study was performed on clinopyroxene crystals along the jadeite, (NaAlSi2O6 Jd)–diopside (CaMgSi2O6 Di) join. In particular, natural samples of jadeite, diopside, P2/n omphacite and three C2/c synthetic samples with intermediate composition (i.e., Jd80, Jd60, Jd40) were investigated. In order to determine the unit-cell volume thermal expansion coefficient (α V), the unit-cell parameters for all these compositions have been measured up to c.a. 1,073?K. The evolution of the unit-cell volume thermal expansion coefficient (α V) along the Jd–Di join at different temperatures has been calculated by using a modified version of the equation proposed by Holland and Powell (J Metamorph Geol 16(3):309-43, 1998). The equation \( a_{{{\text{V}}\;(303{\text{K}},1{\text{bar}})}} = 2.68(3) \times 10^{ - 5} + [1.1\left( 1 \right) \times 10^{ - 8} \times X_{\text{Jd}} ] - [7.1\left( {1.7} \right) \times 10^{ - 10} \times X_{\text{Jd}}^{2} ] \) obtained from the α V at room-T (i.e., α V303K,1bar) allows us to predict the room-T volume thermal expansion for Fe-free C2/c clinopyroxenes with intermediate composition along the binary join Jd-Di. The observed α V value for P2/n omphacite α V(303K,1bar)?=?2.58(5)?×?10??K? was compared with that recalculated for disordered C2/c omphacite published by Pandolfo et al. (Phys Chem Miner 1-0, 2012) [α V(303K,1bar)?=?2.4(5)?×?10??K?]. Despite the large e.s.d.’s for the latter, the difference of both values at room-T is small, indicating that convergent ordering has practically no influence on the room-T thermal expansion. However, at high-T, the smaller thermal expansion coefficient for the C2/c sample with respect to the P2/n one with identical composition could provide further evidence for its reduced stability relative to the ordered one.