Contribution
Diffuse scattering from disordered crystals (minerals)
Frey, Friedrich
European Journal of Mineralogy Volume 9 Number 4 (1997), p. 693 - 704
33 références bibliographiques
publié: Jul 23, 1997
manuscrit reçu: Jun 2, 1995
DOI: 10.1127/ejm/9/4/0693
Abstract
Abstract General aspects of cooperative disorder and related diffuse scattering from crystals are discussed. The general solution of a disorder problem is outlined. Diffuse scattering is due to deviations in space and/or time from an average structure of strict long-range order, where long-range order refers to three-dimensional translational periodicity. Cobalt, cobalt-based alloys and zincblende serve as examples of crystals with onedimensional stacking disorder. The martensitic proto → clino/ortho-enstatite transformation is governed by growth of embryonic preformed CE/OE-faults within the PE matrix; the transformation mechanism can be understood from the disorder of the (CE/OE)-product phase. Complicated disorder phenomena in K-hollandites are related to different dimensionalities of the substructures. Zirconia, ZrO2, doped with various metal oxides, exhibits defect structures which decisively determine material properties. The defect structure can be interpreted by a quantitative analysis of diffuse data in the frame of a model of correlated microdomains. Future trends of disorder diffuse scattering work are outlined.
Mots-clefs
disorder • diffuse scattering • stacking disorder • phase transformations • material properties