Structural relations in mixed oxides Cu{sub x}Zn{sub 1-x}Nb{sub 2}O{sub 6}
- Fachgebiet Strukturforschung, Darmstadt (Germany)
- Laboratoire Leon Brillouin, Gif sur Yvette (France)
Crystal structures of monoclinic CuNb{sub 2}O{sub 6} and mixed niobates Cu{sub x}Zn{sub 1-x}Nb{sub 2}O{sub 6}, with x = 0.85 and 0.36, respectively, have been solved by neutron powder and X-ray single-crystal diffraction. Space groups and cell dimensions are P2{sub 1}/c, a = 5.0064(1) {angstrom}, b = 14.1733(3) {angstrom}, c = 5.7615(1) {angstrom}, {beta} = 91.672(1){degrees} for monoclinic CuNb{sub 2}O{sub 6}; P2{sub 1}/c, a = 5.0070(1) {angstrom}, b = 14.1706(2) {angstrom}, c = 5.7547(1) {angstrom}, and {beta} = 91.451(1){degrees} for Cu{sub 0.085}Zn{sub 0.15}Nb{sub 2}O{sub 6}; and Pbcn, a = 14.187(5) {angstrom}, b = 5.730(2) {angstrom}, and c = 5.031(2) {angstrom} for Cu{sub 0.36}Zn{sub 0.64}Nb{sub 2}O{sub 6}. The crystal structure of orthorhombic CuNb{sub 2}O{sub 6} was confirmed by neutron powder and X-ray single-crystal diffraction. The orientations of the O-Cu-O axes, elongated due to Jahn-Teller distortion, differ in a characteristic way for orthorhombic CuNb{sub 2}O{sub 6} on one hand and monoclinic CuNb{sub 2}O{sub 6} and the monoclinic mixed oxides on the other hand. For Cu{sub 0.36}Zn{sub 0.64}Nb{sub 2}O{sub 6} no elongated axes were found by diffraction methods. A thermally or stress-induced, irreversible transformation from monoclinic to orthorhombic CuNb{sub 2}O{sub 6} has been observed.
- OSTI ID:
- 75774
- Journal Information:
- Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 2 Vol. 115; ISSN 0022-4596; ISSN JSSCBI
- Country of Publication:
- United States
- Language:
- English
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