LnSrScO4 (Ln = La, Ce, Pr, Nd and Sm) systems and structure correlations for A(2)BO(4) (K2NiF4) structure types
LnSrScO4 (Ln = La, Ce, Pr, Nd and Sm) systems and structure correlations for A(2)BO(4) (K2NiF4) structure types
The compounds LnSrScO4, where Ln=La, Ce, Pr, Nd and Sm, have been synthesized. Rietveld profile analysis of powder X-ray diffraction data collected at room temperature reveal that the compounds possess a modified K2NiF4-type structure with orthorhombic cell symmetry formed by tilting of the ScO6 octahedra. Variable temperature (25–1200 °C) powder X-ray diffraction data show that at the highest temperatures the structures of LaSrScO4 and PrSrScO4 transform to the regular tetragonal K2NiF4-structure type but the degree of orthorhombicity (c/a) in the unit cells initially increases on heating for all materials, reaching a maximum near 300 °C. This structural behavior is analyzed in terms of relative ionic radii of the various lanthanides and scandium. A general structural model based on tolerance factors has been developed for the family of materials A2BO4 with various A and B cation sizes.
refinement, scandium, k2nif4-type structure, perovskites, phase transition, oxides, diffraction, chemistry
349-359
Patel, R.
ec08d4e1-fc72-4d22-9f47-2bc83a475b1c
Simon, C.
02904d47-a311-44a0-9f95-362e92b3eb83
Weller, M.T.
36a60b56-049f-466c-a1d7-39d6b0d85ff4
2007
Patel, R.
ec08d4e1-fc72-4d22-9f47-2bc83a475b1c
Simon, C.
02904d47-a311-44a0-9f95-362e92b3eb83
Weller, M.T.
36a60b56-049f-466c-a1d7-39d6b0d85ff4
Patel, R., Simon, C. and Weller, M.T.
(2007)
LnSrScO4 (Ln = La, Ce, Pr, Nd and Sm) systems and structure correlations for A(2)BO(4) (K2NiF4) structure types.
Journal of Solid State Chemistry, 180 (1), .
(doi:10.1016/j.jssc.2006.10.023).
Abstract
The compounds LnSrScO4, where Ln=La, Ce, Pr, Nd and Sm, have been synthesized. Rietveld profile analysis of powder X-ray diffraction data collected at room temperature reveal that the compounds possess a modified K2NiF4-type structure with orthorhombic cell symmetry formed by tilting of the ScO6 octahedra. Variable temperature (25–1200 °C) powder X-ray diffraction data show that at the highest temperatures the structures of LaSrScO4 and PrSrScO4 transform to the regular tetragonal K2NiF4-structure type but the degree of orthorhombicity (c/a) in the unit cells initially increases on heating for all materials, reaching a maximum near 300 °C. This structural behavior is analyzed in terms of relative ionic radii of the various lanthanides and scandium. A general structural model based on tolerance factors has been developed for the family of materials A2BO4 with various A and B cation sizes.
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Submitted date: 5 September 2006
Published date: 2007
Keywords:
refinement, scandium, k2nif4-type structure, perovskites, phase transition, oxides, diffraction, chemistry
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Local EPrints ID: 54357
URI: http://eprints.soton.ac.uk/id/eprint/54357
ISSN: 0022-4596
PURE UUID: 489cb879-bf11-4e37-b74d-ffac6e90ba6e
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Date deposited: 31 Jul 2008
Last modified: 15 Mar 2024 10:47
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Author:
R. Patel
Author:
C. Simon
Author:
M.T. Weller
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