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Structure determination of the layered manganocuprates Ln3Ba2Mn2Cu2O12±y, Ln=Sm, Eu, by powder neutron diffraction

Structure determination of the layered manganocuprates Ln3Ba2Mn2Cu2O12±y, Ln=Sm, Eu, by powder neutron diffraction
Structure determination of the layered manganocuprates Ln3Ba2Mn2Cu2O12±y, Ln=Sm, Eu, by powder neutron diffraction
Samples of Ln(3)Ba(2)Mn(2)Cu(2)O(12+/-y), Ln=Sm, Eu, have been synthesized with non-absorbing isotopes and studied by high-resolution powder neutron diffraction. For Ln=Eu, the material was studied before and after annealing in oxygen. Results show that segregation of the manganese and copper between the layer sites is incomplete and that oxygen can also be incorporated between the CuO5 square-based pyramids giving the overall composition Ln(3)Ba(2)Mn(2)Cu(2)O(12.1). Cation size mismatch on the A-type cation sites leads to a local distortion in the oxide sublattice in the MnO6 octahedra and consideration of the A-site coordination geometries permits an understanding of the limited lanthanide range for which this structure forms. While the Ln and Ba cations are fully segregated the observed B cation disorder and additional inter-cuprate layer oxygen are likely to preclude observation of superconductivity in this family of materials.
cuprate, manganate, neutron diffraction, magnetic-properties, perovskite, crystal, eu3ba2mn2cu2o12, quadruple, defect, chemistry, system, phase
0022-4596
237-244
Field, M.A.L.
afc08c1a-2fc7-4b93-adcf-b3c899d89f68
Knee, C.S.
d241249a-3d10-4b3e-9931-e3dd1029bb30
Weller, M.T.
36a60b56-049f-466c-a1d7-39d6b0d85ff4
Field, M.A.L.
afc08c1a-2fc7-4b93-adcf-b3c899d89f68
Knee, C.S.
d241249a-3d10-4b3e-9931-e3dd1029bb30
Weller, M.T.
36a60b56-049f-466c-a1d7-39d6b0d85ff4

Field, M.A.L., Knee, C.S. and Weller, M.T. (2002) Structure determination of the layered manganocuprates Ln3Ba2Mn2Cu2O12±y, Ln=Sm, Eu, by powder neutron diffraction. Journal of Solid State Chemistry, 167 (1), 237-244. (doi:10.1006/jssc.2002.9650).

Record type: Article

Abstract

Samples of Ln(3)Ba(2)Mn(2)Cu(2)O(12+/-y), Ln=Sm, Eu, have been synthesized with non-absorbing isotopes and studied by high-resolution powder neutron diffraction. For Ln=Eu, the material was studied before and after annealing in oxygen. Results show that segregation of the manganese and copper between the layer sites is incomplete and that oxygen can also be incorporated between the CuO5 square-based pyramids giving the overall composition Ln(3)Ba(2)Mn(2)Cu(2)O(12.1). Cation size mismatch on the A-type cation sites leads to a local distortion in the oxide sublattice in the MnO6 octahedra and consideration of the A-site coordination geometries permits an understanding of the limited lanthanide range for which this structure forms. While the Ln and Ba cations are fully segregated the observed B cation disorder and additional inter-cuprate layer oxygen are likely to preclude observation of superconductivity in this family of materials.

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Published date: 2002
Keywords: cuprate, manganate, neutron diffraction, magnetic-properties, perovskite, crystal, eu3ba2mn2cu2o12, quadruple, defect, chemistry, system, phase

Identifiers

Local EPrints ID: 19733
URI: http://eprints.soton.ac.uk/id/eprint/19733
ISSN: 0022-4596
PURE UUID: 6a518fad-cd75-4e07-a91e-dde1167222c6

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Date deposited: 17 Feb 2006
Last modified: 08 Jan 2022 12:49

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Contributors

Author: M.A.L. Field
Author: C.S. Knee
Author: M.T. Weller

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