Formation of spinel from olivine

Zongwen Liu; Kelly, Patrick M.; Drennan, John; Mora, Peter; Kanda, Hisao
March 2004
Applied Physics Letters;3/15/2004, Vol. 84 Issue 11, p1856
Academic Journal
High-resolution transmission electron microscopy (HRTEM) was used to study the olivine to spinel transformation. HRTEM structure images of Mg[sub 2]GeO[sub 4] olivine deformed under a pressure of 6 GPa at 600 °C clearly show that a shear mechanism dominates the transformation. The transformation is not a nucleation and growth mechanism. It also differs in certain crucial aspects from the type of martensitic transformation proposed before. During the transformation, it is a shear movement that brings the oxygen anions to their positions in the spinel structure. An edge dislocation following each shear then puts the cations in their spinel sites. The Burgers’ vector of each dislocation is perpendicular to the anion shear direction. © 2004 American Institute of Physics.


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