Compressibility of synthetic potassium-rich clinopyroxene: in-situ high-pressure single-crystal x-ray study

Bindi, L.; Downs, R.T.; Harlow, G.E.; Safonov, O.G.; Litvin, Y.A.; Perchuk, L.L.; Menchetti, S.

Статья опубликована в высокорейтинговом журнале

Информация о цитировании статьи получена из Web of Science, Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.

Авторы: Bindi L., Downs R.T., Harlow G.E., Safonov O.G., Litvin Yu A., Perchuk L.L., Menchetti S.
Журнал: American Mineralogist
Том: 91
Год издания: 2006
Издательство: Mineralogical Society of America
Местоположение издательства: United States
Первая страница: 802
Последняя страница: 808
DOI: 10.2138/am.2006.2031
Аннотация: The crystal structure of a synthetic potassium-rich clinopyroxene, (Ca0.88K0.12)(Mg0.83Al0.17)(Si1.98Al0.02)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.
Добавил в систему: Сафонов Олег Геннадьевич

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Compressibility of synthetic potassium-rich clinopyroxene: in-situ high-pressure single-crystal x-ray studyстатья

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