High-pressure crystal structure of kosmochlor, NaCrSi2O6, and systematics of anisotropric compression in pyroxenes

Marcus J. Origlieri, Robert T Downs, Richard M. Thompson, Carolyn J S Pommier, M Bonner Denton, George E. Harlow

Research output: Contribution to journalArticle

40 Citations (Scopus)

Abstract

The crystal structure of synthetic kosmochlor, NaCrSi2O6, was studied using single crystal X-ray diffraction at high pressure. A four-pin diamond anvil cell, with 4:1 methanol:ethanol pressure medium, was used to achieve pressures to 9.28 GPa. Unit-cell data were collected at 20 pressures, and intensity data were collected at 13 of these pressures. Fitting the P-V data to a third-order Birch-Murnaghan equation yields Vo = 418.84(3) Å3, Kc = 134(1) GPa 1, and K1o = 2.0(3). Anisotropic compression was observed with unit strain axial ratios of 1:1.82:2.08. The CrO6 octahedron has a bulk modulus Ko = 90(16) GPa1, while the SiO4 tetrahedron has Ko = 313(55) GPa 1, both with K1o= 4. An o-type rotation of the O3-O3-03 linkage was observed with pressure, with <03-03-03 decreasing from 172.8(2)° to 166.1(7)°. Compression in kosmochlor is related to the stacking directions of distorted cubic closest packed O atom monolayers. Unit strain ellipsoids for diopside. hedenbergite, spodumene (C2/c and P21/c), LiScSi2O6 (C2/c and P2l/c), clinoenstatite, orthoenstatite. and anisotropy of olivine and pyroxene.

Original languageEnglish (US)
Pages (from-to)1025-1032
Number of pages8
JournalAmerican Mineralogist
Volume88
Issue number7
StatePublished - Jul 2003

Fingerprint

pyroxenes
crystal structure
Compaction
Crystal structure
compression
spodumene
hedenbergite
diamond anvil cell
axial strain
enstatite
bulk modulus
diopside
anvils
ellipsoids
Diamond
cells
olivine
stacking
linkages
tetrahedrons

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics

Cite this

High-pressure crystal structure of kosmochlor, NaCrSi2O6, and systematics of anisotropric compression in pyroxenes. / Origlieri, Marcus J.; Downs, Robert T; Thompson, Richard M.; Pommier, Carolyn J S; Denton, M Bonner; Harlow, George E.

In: American Mineralogist, Vol. 88, No. 7, 07.2003, p. 1025-1032.

Research output: Contribution to journalArticle

Origlieri, Marcus J. ; Downs, Robert T ; Thompson, Richard M. ; Pommier, Carolyn J S ; Denton, M Bonner ; Harlow, George E. / High-pressure crystal structure of kosmochlor, NaCrSi2O6, and systematics of anisotropric compression in pyroxenes. In: American Mineralogist. 2003 ; Vol. 88, No. 7. pp. 1025-1032.
@article{dac59c5752d542ee987cf1d7b27d2403,
title = "High-pressure crystal structure of kosmochlor, NaCrSi2O6, and systematics of anisotropric compression in pyroxenes",
abstract = "The crystal structure of synthetic kosmochlor, NaCrSi2O6, was studied using single crystal X-ray diffraction at high pressure. A four-pin diamond anvil cell, with 4:1 methanol:ethanol pressure medium, was used to achieve pressures to 9.28 GPa. Unit-cell data were collected at 20 pressures, and intensity data were collected at 13 of these pressures. Fitting the P-V data to a third-order Birch-Murnaghan equation yields Vo = 418.84(3) {\AA}3, Kc = 134(1) GPa 1, and K1o = 2.0(3). Anisotropic compression was observed with unit strain axial ratios of 1:1.82:2.08. The CrO6 octahedron has a bulk modulus Ko = 90(16) GPa1, while the SiO4 tetrahedron has Ko = 313(55) GPa 1, both with K1o= 4. An o-type rotation of the O3-O3-03 linkage was observed with pressure, with <03-03-03 decreasing from 172.8(2)° to 166.1(7)°. Compression in kosmochlor is related to the stacking directions of distorted cubic closest packed O atom monolayers. Unit strain ellipsoids for diopside. hedenbergite, spodumene (C2/c and P21/c), LiScSi2O6 (C2/c and P2l/c), clinoenstatite, orthoenstatite. and anisotropy of olivine and pyroxene.",
author = "Origlieri, {Marcus J.} and Downs, {Robert T} and Thompson, {Richard M.} and Pommier, {Carolyn J S} and Denton, {M Bonner} and Harlow, {George E.}",
year = "2003",
month = "7",
language = "English (US)",
volume = "88",
pages = "1025--1032",
journal = "American Mineralogist",
issn = "0003-004X",
publisher = "Mineralogical Society of America",
number = "7",

}

TY - JOUR

T1 - High-pressure crystal structure of kosmochlor, NaCrSi2O6, and systematics of anisotropric compression in pyroxenes

AU - Origlieri, Marcus J.

AU - Downs, Robert T

AU - Thompson, Richard M.

AU - Pommier, Carolyn J S

AU - Denton, M Bonner

AU - Harlow, George E.

PY - 2003/7

Y1 - 2003/7

N2 - The crystal structure of synthetic kosmochlor, NaCrSi2O6, was studied using single crystal X-ray diffraction at high pressure. A four-pin diamond anvil cell, with 4:1 methanol:ethanol pressure medium, was used to achieve pressures to 9.28 GPa. Unit-cell data were collected at 20 pressures, and intensity data were collected at 13 of these pressures. Fitting the P-V data to a third-order Birch-Murnaghan equation yields Vo = 418.84(3) Å3, Kc = 134(1) GPa 1, and K1o = 2.0(3). Anisotropic compression was observed with unit strain axial ratios of 1:1.82:2.08. The CrO6 octahedron has a bulk modulus Ko = 90(16) GPa1, while the SiO4 tetrahedron has Ko = 313(55) GPa 1, both with K1o= 4. An o-type rotation of the O3-O3-03 linkage was observed with pressure, with <03-03-03 decreasing from 172.8(2)° to 166.1(7)°. Compression in kosmochlor is related to the stacking directions of distorted cubic closest packed O atom monolayers. Unit strain ellipsoids for diopside. hedenbergite, spodumene (C2/c and P21/c), LiScSi2O6 (C2/c and P2l/c), clinoenstatite, orthoenstatite. and anisotropy of olivine and pyroxene.

AB - The crystal structure of synthetic kosmochlor, NaCrSi2O6, was studied using single crystal X-ray diffraction at high pressure. A four-pin diamond anvil cell, with 4:1 methanol:ethanol pressure medium, was used to achieve pressures to 9.28 GPa. Unit-cell data were collected at 20 pressures, and intensity data were collected at 13 of these pressures. Fitting the P-V data to a third-order Birch-Murnaghan equation yields Vo = 418.84(3) Å3, Kc = 134(1) GPa 1, and K1o = 2.0(3). Anisotropic compression was observed with unit strain axial ratios of 1:1.82:2.08. The CrO6 octahedron has a bulk modulus Ko = 90(16) GPa1, while the SiO4 tetrahedron has Ko = 313(55) GPa 1, both with K1o= 4. An o-type rotation of the O3-O3-03 linkage was observed with pressure, with <03-03-03 decreasing from 172.8(2)° to 166.1(7)°. Compression in kosmochlor is related to the stacking directions of distorted cubic closest packed O atom monolayers. Unit strain ellipsoids for diopside. hedenbergite, spodumene (C2/c and P21/c), LiScSi2O6 (C2/c and P2l/c), clinoenstatite, orthoenstatite. and anisotropy of olivine and pyroxene.

UR - http://www.scopus.com/inward/record.url?scp=0038235674&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0038235674&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:0038235674

VL - 88

SP - 1025

EP - 1032

JO - American Mineralogist

JF - American Mineralogist

SN - 0003-004X

IS - 7

ER -