1. Phase relationships in the systems SmH2SmH3 and SmD2SmD3
- Author
-
O. Greis, Horst Müller, and Peter Knappe
- Subjects
Diffraction ,Superstructure ,Scattering ,Chemistry ,Crystal structure ,Condensed Matter Physics ,Electronic, Optical and Magnetic Materials ,Ion ,Inorganic Chemistry ,Crystallography ,Phase (matter) ,X-ray crystallography ,Kinetic isotope effect ,Materials Chemistry ,Ceramics and Composites ,Physical and Theoretical Chemistry ,Nuclear chemistry - Abstract
The phase relationships in the system SmH 2 SmH 3 have been reinvestigated. Contrary to the literature, the phase widths of SmH 2 and SmH 3 are significantly less extended: SmH 1.95–2.30 (cubic, fluorite-related) and SmH 2.82–2.90 (hexagonal, tysonite-related). In addition, a new intermediate phase of the composition Sm 3 H 7 has been found. This tetragonally distorted fluorite-related phase is similar to the superstructure phase Sm 3 F 7 with regard to the crystal data of the basis structure and the anion/cation ratio. Systematic phase investigations were carried out also in the system SmD 2 SmD 3 , leading to analogous results. The present work shows that the phase relationships in rare-earth hydrides and deuterides are closely related to those of the systems SmF 2 SmF 3 and EuF 2 EuF 3 .
- Published
- 1981