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Advances in the study of the deformation mechanism of stishovite
Author(s) -
Azzopardi Keith M.,
Brincat JeanPierre,
Grima Joseph N.,
Gatt Ruben
Publication year - 2015
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201552069
Subject(s) - stishovite , auxetics , deformation mechanism , octahedron , deformation (meteorology) , mechanism (biology) , materials science , geology , crystallography , mineralogy , composite material , chemistry , crystal structure , physics , quartz , microstructure , quantum mechanics
Stishovite, a mineral which is estimated to be abundant in the Earth's mantle, exhibits negative Poisson's ratios for a range of loading directions at specific ambient pressure ranges. Here, we investigate the deformation mechanisms which lead to auxetic behaviour in the (001) plane in further detail, and show that the two‐dimensional projection of the structure is auxetic by the type α dilating rhombi mechanism. This corroborates the distorting octahedra three‐dimensional mechanism described previously [Azzopardi et al., RSC Adv. 5 , 8974 (2015)].