Compressibility of synthetic potassium-rich clinopyroxene

In-situ high-pressure single-crystal X-ray study

Luca Bindi, Robert T Downs, George E. Harlow, Oleg G. Safonov, Yuriy A. Litvin, Leonid L. Perchuk, Hinako Uchida, Silvio Menchetti

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

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.

Original languageEnglish (US)
Pages (from-to)802-808
Number of pages7
JournalAmerican Mineralogist
Volume91
Issue number5-6
DOIs
StatePublished - May 2006

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compressibility
Compressibility
clinopyroxene
potassium
Potassium
Single crystals
crystal
X rays
single crystals
polyhedrons
x rays
cells
hedenbergite
diamond anvil cell
axial strain
diopside
anvils
equation of state
crystal structure
pyroxene

Keywords

  • Chemical mineral analysis
  • Clinopyroxene
  • Crystal structure
  • High-pressure studies
  • XRD data

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics

Cite this

Bindi, L., Downs, R. T., Harlow, G. E., Safonov, O. G., Litvin, Y. A., Perchuk, L. L., ... Menchetti, S. (2006). Compressibility of synthetic potassium-rich clinopyroxene: In-situ high-pressure single-crystal X-ray study. American Mineralogist, 91(5-6), 802-808. https://doi.org/10.2138/am.2006.2031

Compressibility of synthetic potassium-rich clinopyroxene : In-situ high-pressure single-crystal X-ray study. / Bindi, Luca; Downs, Robert T; Harlow, George E.; Safonov, Oleg G.; Litvin, Yuriy A.; Perchuk, Leonid L.; Uchida, Hinako; Menchetti, Silvio.

In: American Mineralogist, Vol. 91, No. 5-6, 05.2006, p. 802-808.

Research output: Contribution to journalArticle

Bindi, L, Downs, RT, Harlow, GE, Safonov, OG, Litvin, YA, Perchuk, LL, Uchida, H & Menchetti, S 2006, 'Compressibility of synthetic potassium-rich clinopyroxene: In-situ high-pressure single-crystal X-ray study', American Mineralogist, vol. 91, no. 5-6, pp. 802-808. https://doi.org/10.2138/am.2006.2031
Bindi, Luca ; Downs, Robert T ; Harlow, George E. ; Safonov, Oleg G. ; Litvin, Yuriy A. ; Perchuk, Leonid L. ; Uchida, Hinako ; Menchetti, Silvio. / Compressibility of synthetic potassium-rich clinopyroxene : In-situ high-pressure single-crystal X-ray study. In: American Mineralogist. 2006 ; Vol. 91, No. 5-6. pp. 802-808.
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AU - Safonov, Oleg G.

AU - Litvin, Yuriy A.

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N2 - 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.

AB - 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.

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