| Reference Type | Journal (article/letter/editorial) |
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| Title | Chalkogenides of the transition elements. VI. X-Ray, neutron, and magnetic investigation of the spinels Co3O4, NiCo2O4, Co3S4, and NiCo2S4 |
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| Journal | Canadian Journal of Chemistry |
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| Authors | Knop, Osvald | Author |
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| Reid, K. I. G. | Author |
| Sutarno | Author |
| Nakagawa, Yasuaki | Author |
| Year | 1968 (November 15) | Volume | 46 |
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| Page(s) | 3463-3476 | Issue | 22 |
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| Publisher | Canadian Science Publishing |
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| URL | |
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| DOI | doi:10.1139/v68-576Search in ResearchGate |
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| Classification | Not set | LoC | Not set |
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| Mindat Ref. ID | 8291768 | Long-form Identifier | mindat:1:5:8291768:5 |
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| GUID | 0 |
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| Full Reference | Knop, Osvald, Reid, K. I. G., Sutarno, Nakagawa, Yasuaki (1968) Chalkogenides of the transition elements. VI. X-Ray, neutron, and magnetic investigation of the spinels Co3O4, NiCo2O4, Co3S4, and NiCo2S4. Canadian Journal of Chemistry, 46 (22). 3463-3476 doi:10.1139/v68-576 |
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| Plain Text | Knop, Osvald, Reid, K. I. G., Sutarno, Nakagawa, Yasuaki (1968) Chalkogenides of the transition elements. VI. X-Ray, neutron, and magnetic investigation of the spinels Co3O4, NiCo2O4, Co3S4, and NiCo2S4. Canadian Journal of Chemistry, 46 (22). 3463-3476 doi:10.1139/v68-576 |
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| In | (1968, November) Canadian Journal of Chemistry Vol. 46 (22) Canadian Science Publishing |
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| Abstract/Notes | The crystal structures of the spinels Co3O4, NiCo2O4, Co3S4, and NiCo2S4 were refined from X-ray and neutron powder data. Their lattice parameters at room temperature and the positional parameters of the oxygen and sulfur atoms were: Co3O4, 8.0835 ± 6 Å, 0.2640 ± 8; NiCo2O4, 8.114 ± 14 Å, 0.2583 ± 34; Co3S4, 9.4055 ± 12 Å, 0.2591 ± 5; NiCo2S4, 9.3872 ± 7 Å, 0.2591 ± 3. The thermal stabilities of the two oxides in air and in oxygen at 1 atm were investigated by thermogravimetric analysis and differential thermal analysis, and the magnetization of NiCo2O4 was measured down to 4.2 °K in fields up to 11.70 kOe. From neutron diffraction NiCo2O4. was found to be inverse, while NiCo2S4 was shown to be normal. The results of the magnetization measurements and the neutron-diffraction patterns at 111 and 393 °K were found to be equally consistent with the magnetic structure proposed for NiCo2O4 by Blasse, Co2+[Ni3+Co3+]O4 (Co2+ in a high-spin and Ni3+ andCo3+ in low-spin states), and with Co3+[Ni2+Co3+]O4 (Co3+ in 8(a) in a high-spin and Co3+ in 16(d) in a low-spin state). The sublattice magnetizations were not completely aligned even at 4.2 °K; the net magnetic moment derived from the magnetization measurements was only 1.25 μB, which is lower than the value of 2 μB expected from either model. At 111 °K the moments of the ions in the tetrahedral and octahedral sites were estimated to be 1.9 ± 0.2 and −0.5 ± 0.1 bohr magnetons respectively. |
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