Local tetragonal distortions of the (CrF 6 ) and (FeF 6 ) octahedral clusters in Cr - and Fe -doped tetragonal Rb 2 KGaF 6 crystals.
- Resource Type
- Article
- Authors
- Zhou, Ya-Wen; Yang, Li-Rong; Tang, Jie; Mei, Yang
- Source
- Radiation Effects & Defects in Solids: Incorporating Plasma Techniques & Plasma Phenomena. Mar/ Apr2017, Vol. 172 Issue 3/4, p337-341. 5p.
- Subject
- *OCTAHEDRAL molecules
*CRYSTALS
*DOPING agents (Chemistry)
*ELECTRON paramagnetic resonance
*PEROVSKITE
- Language
- ISSN
- 1042-0150
The local tetragonal distortions (α − α0) (whereαis the angle defined as tgα = R⊥/R//,R⊥andR//are the metal–ligand distances parallel with and normal to the C4axis,α0 = 45° is the same angle in cubic symmetry) of (CrF6)3−and (FeF6)3−octahedral clusters in the tetragonal Rb2KGaF6crystals are estimated by analyzing their electron paramagnetic resonance (EPR) zero-field splittingsD. The results indicate that the two impurity octahedra and hence the host (GaF6)3−octahedra are tetragonally elongated. The distortion (α − α0) in magnitude differs from impurity to impurity because of the different sizes and natures of these impurities. These results are analogous to those in ABX3and doped ABX3perovskite crystals where the cubic-to-tetragonal phase transition is due to the rotation of BX6octahedra associated with the release or elongation of B–X bond along the C4rotational axis. [ABSTRACT FROM PUBLISHER]