RANGE, KJ and ROGNER, P and HEYNS, AM and PRINSLOO, LC (1992) AN X-RAY, RAMAN AND IR STUDY OF ALPHA-CSREO4, THE HIGH-TEMPERATURE MODIFICATION OF CESIUM PERRHENATE. ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES, 47 (11). pp. 1513-1520. ISSN 0932-0776,
Full text not available from this repository.Abstract
Cesium perrhenate undergoes a reversible phase transition from the orthorhombic room-temperature phase (beta-CsReO4, space group Pnma) to a tetragonal high-temperature phase (alpha-CsReO4). The space group of alpha-CsReO4 was unambiguously confirmed by high-temperature X-ray diffraction to be I4(1)/amd in contrast to the earlier literature, in which space group I4(1)/a (and hence, a scheelite type structure) was assumed for alpha-CsReO4. From a data set obtained at 468 K the crystal structure of alpha-CsReO4 (a = 5.9607(4), c = 14.446(1) angstrom, Z = 4) was refined to R = 0.032, R(w) = 0.029 using anisotropic displacement factors. In the vibrational spectra not all of the predicted components for beta-CsReO4 could be confirmed by the experiments, but for alpha-CsReO4 very good agreement was obtained between the predicted and observed bands. The fact that nu2 at approximately 300 cm-1 is not observed in the IR spectra of alpha-CsReO4 confirms the space group I4(1)/amd, since, under I4(1)/a symmetry, this band is allowed. The structure of alpha-CsReO4 consists of isolated ReO4 tetrahedra which are linked together by cesium atoms. The relationships between the scheelite, alpha-CsReO4 and beta-CsReO4 structural types are discussed.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | CRYSTAL-STRUCTURE; CESIUM PERRHENATE; HIGH-TEMPERATURE MODIFICATION; CRYSTAL STRUCTURE; VIBRATIONAL SPECTRA |
| Depositing User: | Dr. Gernot Deinzer |
| Last Modified: | 19 Oct 2022 08:44 |
| URI: | https://pred.uni-regensburg.de/id/eprint/54325 |
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