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Compressibility of synthetic potassium-rich clinopyroxene: In-situ high-pressure single-crystal X-ray study
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March 31, 2015
Abstract
The crystal structure of a synthetic potassium-rich clinopyroxene, (Ca0.88K0.12)(Mg0.83Al0.17)(Si1.98 Al0.02)O6, was studied using high-pressure single-crystal X-ray diffraction methods. A four-pin diamond anvil cell with 4:1 methanol:ethanol pressure medium was used to achieve pressures to 9.72 GPa. Unit-cell data were measured at 17 pressures, and intensity data were collected at 6 pressures. Fitting the P-V data to the third-order Birch-Murnaghan equation of state yields V0 = 435.49(3) Å3, K0= 129(1) GPa, K’ = 2.7(3). Anisotropic compression was observed with unit strain axial ratios of 1:1.94:1.90. Unit-cell parameters decrease gradually as a function of pressure with axial compressibilities βb > βc ~ βa. They match those found for kosmochlor but are stiffer than those observed for synthetic diopside and hedenbergite. Compressibilities of the bond distances within the M2, M1, and T polyhedra show significant anisotropy. The incorporation of K into the clinopyroxene structure has little effect on its compressibility, although the concomitant substitution of Al in M1 from the K-Jd component reduces its compressibility. The K atom is softer than the M2 polyhedron and thus shrinks enough at high pressure to fit into the pyroxene structure.
Keywords : High-pressure studies; clinopyroxene; crystal structure; XRD data; chemical mineral analysis
Received: 2005-7-7
Accepted: 2005-12-25
Published Online: 2015-3-31
Published in Print: 2006-5-1
© 2015 by Walter de Gruyter Berlin/Boston
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Keywords for this article
High-pressure studies;
clinopyroxene;
crystal structure;
XRD data;
chemical mineral analysis
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