Structure models for β-MnGa 2S 4 as derived from electron diffraction and high-resolution electron microscopy
Abstract
A study by high-resolution electron microscopy and electron diffraction on the tetrahedrally coordinated compound β-MnGa 2S 4 is reported. The structure-imaging technique enabled a new structure model to be proposed for the accommodation of deviations from stoichiometry in compounds of the type {x MnS}/{y Ga 2S 3}. The model is based on the Ga 2S 3 structure wherein by the substitution of MnS layers chemical twin planes are formed. Depending on the spacing of the periodic twin planes a homologous series of compounds is expected and a number of members of this series was identified mainly by electron diffraction. In the β-MnGa 2S 4 compound, two structure modifications are observed mainly differing in the orientation of the twin planes (coherent or incoherent). This conclusion is substantiated by structure image calculations for the interpretation of the high-resolution results.
- Publication:
-
Journal of Solid State Chemistry France
- Pub Date:
- November 1984
- DOI:
- 10.1016/0022-4596(84)90259-7
- Bibcode:
- 1984JSSCh..55..133D