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- Title
The high-pressure behavior of balliranoite: a cancrinite-group mineral.
- Authors
Lotti, Paolo; Gatta, G. Diego; Rotiroti, Nicola; Cámara, Fernando; Harlow, George E.
- Abstract
The high-pressure elastic behavior and structure evolution of a natural balliranoite, i.e. a mineral isotypic with cancrinite belonging to the davyne subgroup, (NaCaK)(SiAlO)Cl(CO)(SO), a = 12.680(1) Å, c = 5.3141(5) Å and V = 739.9(1) Å, S.G. P6, have been studied by means of in-situ single-crystal X-ray diffraction with a diamond anvil cell, up to 6.77(2) GPa. No evidence of phase transition, structure collapse or change of the compressional behavior have been observed within the pressure range investigated. The unit-cell volume evolution as function of pressure has been fitted with a second-order Birch-Murnaghan equation of state (BM EoS), yielding the following refined parameters: V = 735.5(7) Å, K = 48.1(8) GPa. Fitting of the a vs. P and c vs. P data with linearized third-order BM-EoS leads to the following elastic anisotropy at ambient conditions: K: K = 1.35:1. The P-induced structure evolution of balliranoite is mainly governed by the framework re-arrangement through tilting of quasi-rigid tetrahedra. A comparative analysis of the elastic behavior and of the structure deformation mechanisms of balliranoite and cancrinite at high-pressure are carried out.
- Subjects
CANCRINITE; X-ray diffraction; PHASE transitions; SINGLE crystals; MURNAGHAN equation; ANISOTROPY
- Publication
Zeitschrift für Kristallographie. Crystalline Materials, 2014, Vol 229, Issue 2, p63
- ISSN
2194-4946
- Publication type
Article
- DOI
10.1515/zkri-2013-1626