Condensed phonon modes and the recently discovered displacive superlattice of nickel arsenide
- 20 January 1988
- journal article
- Published by IOP Publishing in Journal of Physics C: Solid State Physics
- Vol. 21 (2) , 309-318
- https://doi.org/10.1088/0022-3719/21/2/014
Abstract
Recently a weak, orthorhombic, displacive superlattice was observed in both mineral and synthetic samples of NiAs. The symmetry-adapted displacement eigenvectors and corresponding atomic displacement patterns of the normal modes of the unmodulated sub-cell associated with the observed modulation wavevector (q=1/3 (1120)) are derived. Comparison with an experimental convergent-beam electron diffraction study strongly suggests that the deviation of the modulated structure from the unmodulated parent structure can largely be ascribed to the condensation, or freezing-in, of a q=1/3 (1120), Sigma 6 phonon mode.Keywords
This publication has 6 references indexed in Scilit:
- Crystal chemistry of the chalcogenides and pnictides of the transition elementsPublished by Springer Nature ,2008
- Analysis of a displacive superlattice in nickel arsenidePhilosophical Magazine Letters, 1987
- Transition metal sulfidesProgress in Solid State Chemistry, 1976
- On Phase Transitions between the MnP and NiAs Type Structures.Acta Chemica Scandinavica, 1973
- Symmetry Properties of the Normal Vibrations of a CrystalReviews of Modern Physics, 1968
- Phases with the nickel arsenide and closely-related structuresProgress in Solid State Chemistry, 1964