| | 1 | Author
| W.-D Griebler, D. Babel | Requires cookie* | | | Title
| Röntgenograpliische und magnetische Untersuchungen an perowskitverwandten Cyanoverbindungen CsM ,I M III (CN)6 X-Ray and Magnetic Studies of Perovskite-Related Cyano Compounds CsM II M TII (CN)6  | | | | Abstract
| The perovskite-related cyano compounds CsMnCr(CN)6 (Mn = Mn, Zn), CsZnFe(CN)6 and CsMnCo(CN)6 (Mn = Mn-Cu) are characterized by their IR active C N and Mm-CN stretching frequencies, their lattice constants and their magnetic suscept ibilities (4,2-295 K). Except for CsCuCo(CN)6, which is tetragonally distorted, all compounds crystallize cubically face-centered (with lattice constants in the range from 1020 to 1084 pm). The magnetic behaviour indicates low spin Mm and high spin Mn states, supporting the IR evidence for a strictly ordered Mm—CN—Mn arrangement. The compound CsMnCr(CN)6 is ferrimagnetic, with a Neel temperature of T>j = 90 K and an extrapolated spontaneous magnetization of a = 2,30 //B at 0 K. Superexchange interactions via the cyano bridges are considered responsible for the ferrimagnetism observed. | | | |
Reference
| Z. Naturforsch. 37b, 832—837 (1982); eingegangen am 5. März 1982 | | | |
Published
| 1982 | | | |
Keywords
| Cyano Perovskites, Lattice Constants, Magnetic Susceptibilities, Ferrimagnetism | | | |
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| default:Reihe_B/37/ZNB-1982-37b-0832.pdf | | | | Identifier
| ZNB-1982-37b-0832 | | | | Volume
| 37 | |
| 2 | Author
| H. Holler, W. Kurtz, D. Babel, Sonderforschungsbereich, (. Kristallstruktur, Chemische Bindung, W. Knop | Requires cookie* | | | Title
| Die Kristall-und magnetische Struktur von BaCrF5 Crystal and Magnetic Structure of BaCrF5 | | | | Abstract
| A single crystal X-ray structure analysis of orthorhombic BaCrFs (a — 1393.8(1), b = 571,1(1), c = 494,7(1) pm), which crystallizes in the structure type of BaGaF5, space group P2i2i2i, yielded Cr-F distances in the range of 187.3 to 194.9 pm, average 190.2 pm. Using powder neutron diffraction data taken at 2.2 K a G-type antiferromagnetic structure with spin alignment along the c direction of the lattice was worked out. Single crystal susceptibility data were consistent with this model and in addition showed a small net moment, probably due to spin canting, to be present below the Neel temperature of TN = 3.4 K. The orientation of this moment along the b axis is in accordance with the space group symmetry as well, chemical and magnetic cell being the same. From powder susceptibility data an exchange energy of —3.74 K (g = 2.02) was obtained by fitting Fisher's model. The low bridging angle of Cr-F-Cr = 137.4° within the eis corner-sharing chain of octahedra is made responsible for the weak antiferromagnetism in BaCrFs, which is compared to that of other chromium(III) fluorides. | | | |
Reference
| (Z. Naturforsch. 37b, 54—60 [1982]; eingegangen am 21. August 1981) | | | |
Published
| 1982 | | | |
Keywords
| Pentafluorochromate(HI), Crystal Structure, Magnetic Structure, Magnetic Susceptibility | | | |
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| 37 | |
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