| Reference Type | Journal (article/letter/editorial) |
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| Title | The influence of next nearest neighbours on cation radii in spinels: the example of the Co3O4-CoCr2O4 solid solution |
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| Journal | Mineralogical Magazine |
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| Authors | O’Neill, H. St. C. | Author |
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| Year | 2003 (June) | Volume | 67 |
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| Issue | 3 |
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| Publisher | Mineralogical Society |
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| DOI | doi:10.1180/0026461036730116Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 243445 | Long-form Identifier | mindat:1:5:243445:6 |
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| GUID | 0 |
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| Full Reference | O’Neill, H. St. C. (2003) The influence of next nearest neighbours on cation radii in spinels: the example of the Co3O4-CoCr2O4 solid solution. Mineralogical Magazine, 67 (3) 547-554 doi:10.1180/0026461036730116 |
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| Plain Text | O’Neill, H. St. C. (2003) The influence of next nearest neighbours on cation radii in spinels: the example of the Co3O4-CoCr2O4 solid solution. Mineralogical Magazine, 67 (3) 547-554 doi:10.1180/0026461036730116 |
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| Abstract/Notes | AbstractLattice parameters and crystal structures of the synthetic spinels Co3O4, CoCr2O4, and solid solutions in the binary join Co3O4-CoCr2O4, have been determined by powder X-ray diffraction structural refinements. In all these spinels the cation distribution is completely normal at room temperature, and the tetrahedrally coordinated cation site is occupied only by Co2+. The ionic radius of Co2+(tet) increases from 0.556(3) in Co3O4to 0.599(4) in CoCr2O4. In the spinel structure, the interatomic distance between the tetrahedral cations and oxygen are geometrically independent of those between the octahedral cations and oxygen; thus the variation in effective ionic radii is ascribed to next-nearest neighbour effects, induced by covalent tendencies in the low-spin Co3+-O bond. The results demonstrate that the assumption of constant ionic radii even within an isomorphic group such as the oxide spinels needs to be made with caution. |
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