Determination of the structure of the orthorhombic commensurate superlattice state of 2H-TaSe2by convergent-beam electron diffraction
- 30 January 1985
- journal article
- Published by IOP Publishing in Journal of Physics C: Solid State Physics
- Vol. 18 (3) , 499-517
- https://doi.org/10.1088/0022-3719/18/3/004
Abstract
Based on the analysis of higher-order Laue zone diffraction by Bird (1985), the structure of the commensurate superlattice state of 2H-TaSe2 is determined by convergent-beam electron diffraction. It is shown that the most general displacements allowed by the orthorhombic space group can be described by a set of displacement waves. Only those waves with wavevector 1/3a* and Sigma 1 symmetry have significant amplitudes. The final displacement pattern shows that each layer is strongly orthorhombic, in contrast with some recent Landau theory predictions.Keywords
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