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System Ba/sub 2/Znsub(1-x)Cusub(x)UO/sub 6/ - a vibrational spectroscopic proof of the Jahn Teller effect

Abstract

The ordered perovskites Ba/sub 2/ZnUO/sub 6/ (cubic, space group Fm3m) and Ba/sub 2/CuUO/sub 6/ (tetragonal, space group I/sub 4//mmm) form solid solutions. For small Cu content the lattice symmetry is cubic, with x>=0.25 an increasing tetragonal distortion (c/a ..sqrt..2 > 1) is observed. From the vibrational spectra and in accordance with the factor group analysis the symmetry of the UO/sub 6/ octahedra is for small Cu content Osub(h) and on the Cu-rich side Dsub(4h). In the region of the lattice vibrations (T/sub 2/ field) the lifting of the degeneracy - due to the Jahn Teller effect of Cu/sup 2 +/ - leads to a band separation, which decreases with sinking copper content. Therefore the Jahn Teller effect is easily noticeable with vibrational spectroscopic methods. In the corresponding series with Wsup(VI) the vibrational spectroscopic investigations lead qualitatively to the same results as in the Usup(VI) system. As further examples the stacking polytypes Ba/sub 2/ZnTeO/sub 6/ and Ba/sub 2/CuTeO/sub 6/ are considered. The vibrational spectra show, that the Jahn Teller effect in this lattice, which is strengthened by partial face-sharing of octahedra, is less pronounced than in the perovskites in which only corner-sharing is present.
Authors:
Kemmler-Sack, S; Rother, H J [1] 
  1. Tuebingen Univ. (Germany, F.R.). Inst. fuer Chemie
Publication Date:
Jan 01, 1979
Product Type:
Journal Article
Reference Number:
AIX-10-465336; EDB-80-029604
Resource Relation:
Journal Name: Z. Anorg. Allg. Chem.; (German Democratic Republic); Journal Volume: 448
Subject:
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY; BARIUM COMPOUNDS; INFRARED SPECTRA; JAHN-TELLER EFFECT; COPPER COMPOUNDS; URANYL COMPOUNDS; ZINC COMPOUNDS; CHEMICAL PREPARATION; CUBIC LATTICES; LATTICE PARAMETERS; RAMAN SPECTRA; SOLID SOLUTIONS; SPACE GROUPS; STRUCTURAL CHEMICAL ANALYSIS; TETRAGONAL LATTICES; ACTINIDE COMPOUNDS; ALKALINE EARTH METAL COMPOUNDS; CRYSTAL LATTICES; CRYSTAL STRUCTURE; DISPERSIONS; MIXTURES; SOLUTIONS; SPECTRA; SYNTHESIS; TRANSITION ELEMENT COMPOUNDS; URANIUM COMPOUNDS; 400702* - Radiochemistry & Nuclear Chemistry- Properties of Radioactive Materials
OSTI ID:
5738653
Country of Origin:
Germany
Language:
German
Other Identifying Numbers:
Journal ID: CODEN: ZAACA
Submitting Site:
INIS
Size:
Pages: 143-155
Announcement Date:

Citation Formats

Kemmler-Sack, S, and Rother, H J. System Ba/sub 2/Znsub(1-x)Cusub(x)UO/sub 6/ - a vibrational spectroscopic proof of the Jahn Teller effect. Germany: N. p., 1979. Web. doi:10.1002/zaac.19794480117.
Kemmler-Sack, S, & Rother, H J. System Ba/sub 2/Znsub(1-x)Cusub(x)UO/sub 6/ - a vibrational spectroscopic proof of the Jahn Teller effect. Germany. doi:10.1002/zaac.19794480117.
Kemmler-Sack, S, and Rother, H J. 1979. "System Ba/sub 2/Znsub(1-x)Cusub(x)UO/sub 6/ - a vibrational spectroscopic proof of the Jahn Teller effect." Germany. doi:10.1002/zaac.19794480117. https://www.osti.gov/servlets/purl/10.1002/zaac.19794480117.
@misc{etde_5738653,
title = {System Ba/sub 2/Znsub(1-x)Cusub(x)UO/sub 6/ - a vibrational spectroscopic proof of the Jahn Teller effect}
author = {Kemmler-Sack, S, and Rother, H J}
abstractNote = {The ordered perovskites Ba/sub 2/ZnUO/sub 6/ (cubic, space group Fm3m) and Ba/sub 2/CuUO/sub 6/ (tetragonal, space group I/sub 4//mmm) form solid solutions. For small Cu content the lattice symmetry is cubic, with x>=0.25 an increasing tetragonal distortion (c/a ..sqrt..2 > 1) is observed. From the vibrational spectra and in accordance with the factor group analysis the symmetry of the UO/sub 6/ octahedra is for small Cu content Osub(h) and on the Cu-rich side Dsub(4h). In the region of the lattice vibrations (T/sub 2/ field) the lifting of the degeneracy - due to the Jahn Teller effect of Cu/sup 2 +/ - leads to a band separation, which decreases with sinking copper content. Therefore the Jahn Teller effect is easily noticeable with vibrational spectroscopic methods. In the corresponding series with Wsup(VI) the vibrational spectroscopic investigations lead qualitatively to the same results as in the Usup(VI) system. As further examples the stacking polytypes Ba/sub 2/ZnTeO/sub 6/ and Ba/sub 2/CuTeO/sub 6/ are considered. The vibrational spectra show, that the Jahn Teller effect in this lattice, which is strengthened by partial face-sharing of octahedra, is less pronounced than in the perovskites in which only corner-sharing is present.}
doi = {10.1002/zaac.19794480117}
journal = {Z. Anorg. Allg. Chem.; (German Democratic Republic)}
volume = {448}
journal type = {AC}
place = {Germany}
year = {1979}
month = {Jan}
}