Data di Pubblicazione:
2014
Citazione:
The high-pressure behavior of balliranoite : a cancrinite group mineral / P. Lotti, G.D. Gatta, N. Rotiroti, F. Cámara, G.E. Harlow. - In: ZEITSCHRIFT FUR KRISTALLOGRAPHIE. - ISSN 0044-2968. - 229:2(2014), pp. 63-76. [10.1515/zkri-2013-1626]
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,
(Na4:47Ca2:86K0:11)(Si5:96Al6:04O24)Cl2:03(CO3)0:78(SO4)0:33, a =
12.680(1) Å, c = 5.3141(5) Å and V = 739.9(1) Å3, S.G. P63,
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 unitcell
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:
V0 = 735.5(7) Å3, KV0 = 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: Ka0 : Kc0 = 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.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
High pressure; Balliranoite; Cancrinite; Davyne; Equation of state
Elenco autori:
P. Lotti, G.D. Gatta, N. Rotiroti, F. Cámara, G.E. Harlow
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