Structural chemistry and magnetic properties of Y₂CoGe₄O₁₂
<p style="text-align:justify;"> Polycrystalline Y₂CoGe₄O₁₂ has been prepared by standard ceramic methods. The crystal structure (space group P4/nbm; a=9.8465(2), c=4.92986(9) Å) consists of metal-rich layers separated from each other by Ge4O12 groups comprised of four corner-sharing...
| Main Authors: | , , , , |
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| Format: | Journal article |
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Elsevier
2015
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| _version_ | 1797098334067884032 |
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| author | Liu, X Battle, P Ridout, J Xu, D Ramos, S |
| author_facet | Liu, X Battle, P Ridout, J Xu, D Ramos, S |
| author_sort | Liu, X |
| collection | OXFORD |
| description | <p style="text-align:justify;"> Polycrystalline Y₂CoGe₄O₁₂ has been prepared by standard ceramic methods. The crystal structure (space group P4/nbm; a=9.8465(2), c=4.92986(9) Å) consists of metal-rich layers separated from each other by Ge4O12 groups comprised of four corner-sharing GeO4 tetrahedra. Two cation sites lie within the layers; an eight-coordinate site occupied by yttrium and a six-coordinate site occupied by a 1:1 disordered distribution of yttrium and cobalt. Neutron diffraction revealed two-fold disorder on the oxide sublattice; this has been elucidated using Co K-edge EXAFS spectroscopy. The availability of two sites allows each oxide ion to accommodate the coordination preferences of its single Co/Y neighbour; the GeO4 tetrahedra distort to absorb any consequent strain. The octahedron of anions around each Co2+ cation shows a pseudo-tetragonal distortion with a strain (Co–O)eq–(Co–O)ax/(Co–O)eq=−0.173. This results in an unusually large effective magnetic moment of 6.05 µB per Co2+ cation. </p> |
| first_indexed | 2024-03-07T05:08:01Z |
| format | Journal article |
| id | oxford-uuid:da9b592c-c4d6-4f9c-9185-d3e560a0e19d |
| institution | University of Oxford |
| last_indexed | 2024-03-07T05:08:01Z |
| publishDate | 2015 |
| publisher | Elsevier |
| record_format | dspace |
| spelling | oxford-uuid:da9b592c-c4d6-4f9c-9185-d3e560a0e19d2022-03-27T09:04:18ZStructural chemistry and magnetic properties of Y₂CoGe₄O₁₂Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:da9b592c-c4d6-4f9c-9185-d3e560a0e19dSymplectic Elements at OxfordElsevier2015Liu, XBattle, PRidout, JXu, DRamos, S <p style="text-align:justify;"> Polycrystalline Y₂CoGe₄O₁₂ has been prepared by standard ceramic methods. The crystal structure (space group P4/nbm; a=9.8465(2), c=4.92986(9) Å) consists of metal-rich layers separated from each other by Ge4O12 groups comprised of four corner-sharing GeO4 tetrahedra. Two cation sites lie within the layers; an eight-coordinate site occupied by yttrium and a six-coordinate site occupied by a 1:1 disordered distribution of yttrium and cobalt. Neutron diffraction revealed two-fold disorder on the oxide sublattice; this has been elucidated using Co K-edge EXAFS spectroscopy. The availability of two sites allows each oxide ion to accommodate the coordination preferences of its single Co/Y neighbour; the GeO4 tetrahedra distort to absorb any consequent strain. The octahedron of anions around each Co2+ cation shows a pseudo-tetragonal distortion with a strain (Co–O)eq–(Co–O)ax/(Co–O)eq=−0.173. This results in an unusually large effective magnetic moment of 6.05 µB per Co2+ cation. </p> |
| spellingShingle | Liu, X Battle, P Ridout, J Xu, D Ramos, S Structural chemistry and magnetic properties of Y₂CoGe₄O₁₂ |
| title | Structural chemistry and magnetic properties of Y₂CoGe₄O₁₂ |
| title_full | Structural chemistry and magnetic properties of Y₂CoGe₄O₁₂ |
| title_fullStr | Structural chemistry and magnetic properties of Y₂CoGe₄O₁₂ |
| title_full_unstemmed | Structural chemistry and magnetic properties of Y₂CoGe₄O₁₂ |
| title_short | Structural chemistry and magnetic properties of Y₂CoGe₄O₁₂ |
| title_sort | structural chemistry and magnetic properties of y₂coge₄o₁₂ |
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