Synthesis, structure, and magnetic properties of Ca{sub 3}BMnO{sub 6} (B = Ni, Zn) and Ca{sub 3}ZnCoO{sub 6} crystallizing in the K{sub 4}CdCl{sub 6} structure
- Kyoto Univ., Uji, Kyoto (Japan). Inst. for Chemical Research
- Japan Atomic Energy Research Inst., Tokai, Ibaraki (Japan). Advanced Science Research Center
Ca{sub 3}BMnO{sub 6} (B = Ni, Zn) and Ca{sub 3}ZnCoO{sub 6} were synthesized and studied by X-ray powder diffraction, neutron powder diffraction, and SQUID magnetometry. All these compounds were found to crystallize in the K{sub 4}CdCl{sub 6} structure containing alternate chains made of face-sharing B(II)O{sub 6} trigonal prisms and B{prime}(IV)O{sub 6} octahedra (B{prime} = Mn, Co). Ca{sub 3}NiMnO{sub 6} (CNMO) and Ca{sub 3}ZnMnO{sub 6} (CZMO) were found to be antiferromagnets with a T{sub N} of 19 and 25.5 K, respectively. CNMO showed a pronounced one-dimensional antiferromagnetic character like a broad susceptibility maximum at 100 K due to short range ordering, while CZMO behaved as a three-dimensional system since the presence of nonmagnetic Zn{sup 2+} ions suppressed the intrachain exchange interaction. A simple collinear antiferromagnetic structure with an ordered moment of 2.43(15) {mu}{sub B}/Mn was found in CZMO, while CNMO showed a spiral structure with ordered moments of 2.2(2) {mu}{sub B}/Mn and 1.4(2) {mu}{sub B}/Ni. Ca{sub 3}ZnCoO{sub 6}, on the other hand, showed a ferromagnetic, nonlinear field dependence of magnetization below 90 K, with a hysteresis appearing just below 25 K, and a spontaneous moment measured at 5 K was 0.6 {mu}{sub B}/Co, suggesting the Co{sup 4+} ions being in low spin state. 15 refs., 6 figs., 2 tabs.
- OSTI ID:
- 679236
- Journal Information:
- Journal of Solid State Chemistry, Vol. 145, Issue 1; Other Information: PBD: Jun 1999
- Country of Publication:
- United States
- Language:
- English
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