Synthesis, crystal structure, and magnetic properties of complex oxides Cu{sub 2}BSbO{sub 6} (B = Mn, Fe, Ga) with a bixbyite structure
- Inst. of Solid State Chemistry, Ekaterinburg (Russian Federation)
New complex oxides Cu{sub 2}BSbO{sub 6}(B = Mn{sup 3+}, Fe{sup 3+}, Ga{sup 3+}) with a body-centered cubic elementary cell (the bixbyite type structure) and parameters 9.5667(3), 9.5622(3), and 9.5237(3) {angstrom}, respectively, have been synthesized in air at 950{degrees}C from simple Cu, Sb, Mn, Fe, and Ga oxides. Rietveld`s method for full-profile analysis was employed to refine the structure parameters of one of the obtained compounds, Cu{sub 2}FeSbO{sub 6}. Sb occupies 8b sites and Cu and Fe are in 24d sites. From cation-oxygen and oxygen-oxygen interatomic distances, it was shown that Sb occurs within an almost regular SbO{sub 6} octahedron (R{sub Sb-O} = 2.00 {angstrom}), while Fe and Cu are located inside strongly distorted octahedra (R{sub M-O}({angstrom}) - 1.938, 2.020, and 2.311). Magnetic susceptibility X of the compounds was measured. For Cu{sub 2}GaSbO{sub 6}, X(T) obeys the Curie-Weiss law in the temperature range 77-300 K. For Cu{sup 2+}, the values of Weiss`s constant and the magnetic moment (c=0.42, {mu} = 1.81{mu}{sub B}) are close to the theoretical ones. A transition to the antiferromagnetic state was observed at 15.6 K for Cu{sub 2}FeSbO{sub 6} and at 5.9 K for Cu{sub 2}MnSbO{sub 6}.
- OSTI ID:
- 508646
- Journal Information:
- Journal of Solid State Chemistry, Vol. 113, Issue 1; Other Information: PBD: Nov 1994
- Country of Publication:
- United States
- Language:
- English
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