Extended Defects and Vacancy Non-Stoichiometry in Rock-Forming Minerals
- Robert N. Schock
Published Online: 18 MAR 2013
Copyright 1985 by the American Geophysical Union.
Point Defects in Minerals
How to Cite
Veblen, D. R. (1985) Extended Defects and Vacancy Non-Stoichiometry in Rock-Forming Minerals, in Point Defects in Minerals (ed R. N. Schock), American Geophysical Union, Washington, D. C.. doi: 10.1029/GM031p0122
- Published Online: 18 MAR 2013
- Published Print: 1 JAN 1985
Print ISBN: 9780875900568
Online ISBN: 9781118664070
- Mineralogical chemistry—Congresses;
Extended defects in minerals, both linear and planar, can have geochemically and geophysically important consequences. Whereas point defects can be investigated fruitfully with theoretical methods, transmission electron microscopy provides an important experimental tool for studying extended defects. In at least some cases, there may be a dynamic chemical relationship between point defect concentrations and the length or area of dislocations or planar defects in a crystal. Many solid-state reactions take place by mechanisms involving the nucleation and propagation of dislocations or planar defects. Extended defects also may alter the diffusion properties of minerals, especially important in the case of replacement reactions. Substantial non-stoichiometry resulting from the substitution of large proportions of vacancies on cation sites is a common feature in a wide variety of important rock-forming minerals and may provide an opportunity for studying the detailed structural properties of vacancies.