Elastic behavior of vanadinite, Pb10 (VO4)6Cl2, a microporous non-zeolitic mineral

G. Diego Gatta, Yongjae Lee, Chi Chang Kao

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Abstract

The high-pressure behavior of a vanadinite (Pb10 (VO4)6Cl2, a = b = 10.3254(5), c = 7.3450(4) Å, space group P63/m), a natural microporous mineral, has been investigated using in-situ HP-synchrotron X-ray powder diffraction up to 7.67 GPa with a diamond anvil cell under hydrostatic conditions. No phase transition has been observed within the pressure range investigated. Axial and volume isothermal Equations of State (EoS) of vanadinite were determined. Fitting the P-V data with a third-order Birch-Murnaghan (BM) EoS, using the data weighted by the uncertainties in P and V, we obtained: V0 = 681(1) Å3, K0 = 41(5) GPa, and K′ = 12.5(2.5). The evolution of the lattice constants with P shows a strong anisotropic compression pattern. The axial bulk moduli were calculated with a third-order "linearized" BM-EoS. The EoS parameters are: a0 = 10.3302(2) Å, K0(a) = 35(2) GPa and K′(a) = 10(1) for the a-axis; c0 = 7.3520(3) Å, K0(c) = 98(4) GPa, and K′(c) = 9(2) for the c-axis (K0(a):K0(c) = 1:2.80). Axial and volume Eulerianfinite strain (fe) at different normalized stress (Fe) were calculated. The weighted linear regression through the data points yields the following intercept values: Fea(0) = 35(2) GPa for the a-axis, Fec(0) = 98(4) GPa for the c-axis and FeV(0) = 45(2) GPa for the unit-cell volume. The slope of the regression lines gives rise to K′ values of 10(1) for the a-axis, 9(2) for the c-axis and 11(1) for the unit cell-volume. A comparison between the HP-elastic response of vanadinite and the iso-structural apatite is carried out. The possible reasons of the elastic anisotropy are discussed.

Original languageEnglish
Pages (from-to)311-317
Number of pages7
JournalPhysics and Chemistry of Minerals
Volume36
Issue number6
DOIs
Publication statusPublished - 2009

Bibliographical note

Funding Information:
Research carried out in part at the NSLS at BNL is supported by the US DoE (DE-AC02-98CH10886 for beamline X7A). We gratefully acknowledge the Geophysical Laboratory of the Carnegie Institute for access to their ruby laser system at beamline X17C. G. Diego Gatta thanks the Italian Ministry of University and Research, MIUR-Project: 2006040119_004. Y. Lee thanks the support by the Korea Science & Engineering Foundation through the Nuclear R&D Program (Grant No. M2AM06-2008-03931). The editor M. Rieder and the reviewers W. Crichton and G. Bromiley are thanked.

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Geochemistry and Petrology

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