热膨胀
鸽铁矿
辉石
辉石
透辉石
顽火辉石
正交晶系
矿物学
结晶学
单斜晶系
体积热力学
体积膨胀
热力学
材料科学
化学
地质学
晶体结构
陨石
橄榄石
斜长石
球粒陨石
物理
医学
内科学
石英
天文
复合材料
作者
Guy L. Hovis,Mario Tribaudino,Amanda Leaman,Christine Almer,Caitlin Altomare,Matthew C. Morris,Nicole Maksymiw,Derek W. Morris,Kevin T. Jackson,Brian L. Scott,Gary Tomaino,Luciana Mantovani
摘要
Abstract To examine the effects of chemical composition on thermal expansion in the pyroxene mineral group, X-ray diffraction data have been collected from room temperature to ~925 °C on a chemically diverse group of 13 pyroxenes including four orthorhombic and nine monoclinic samples. Additionally, resulting unit-cell volumes computed from the XRD data have proven to be good tests for a large number of thermal expansion models; the physical model by Kroll and coworkers and the empirical one by Fei have been found to be especially useful. Modeling also has allowed the connection of present data, collected at temperatures above 25 °C, to the volume data of other workers for much lower temperatures, well below 0 °C, and also extrapolation of values for volume and thermal expansion well beyond the measurement range. We have found for orthopyroxenes that Fe2+-Mg2+ substitution has little effect on thermal expansion coefficients for volume. For clinopyroxenes, however, greater thermal expansion occurs in Ca2+-(diopside, augite, hedenbergite, johannsenite) than in Li+-(spodumene) or Na+-bearing members (jadeite, aegirine, kosmochlor). Present data support the observation that differences in volume thermal expansion relate primarily to differences in expansion along the b crystallographic axis. This apparently is due to the greater concentration of M1 polyhedra along the b crystallographic axis, where expansion differences can be related to the shared O1-O1 polyhedral edge and inter-oxygen repulsion that is made easier by divalent, as opposed to trivalent, cation occupancy of the M1 crystallographic site.
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