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Author | Dixon, E.; Hadermann, J.; Hayward, M.A. | ||||
Title | The synthesis and complex anion-vacancy ordered structure of La0.33Sr0.67MnO2.42 | Type | A1 Journal article | ||
Year | 2011 | Publication | Journal of solid state chemistry | Abbreviated Journal | J Solid State Chem |
Volume | 184 | Issue | 7 | Pages | 1791-1799 |
Keywords | A1 Journal article; Electron microscopy for materials research (EMAT) | ||||
Abstract | The low-temperature topotactic reduction of La0.33Sr0.67MnO3 with NaH results in the formation of La0.33Sr0.67MnO2.42. A combination of neutron powder and electron diffraction data show that La0.33Sr0.67MnO2.42 adopts a novel anion-vacancy ordered structure with a 6-layer OOTOOT' stacking sequence of the octahedral and tetrahedral layers (Pcmb, a=5.5804(1) Å, b=23.4104(7) Å, c=11.2441(3) Å). A significant concentration of anion vacancies at the anion site, which links neighbouring octahedral layers means that only 25% of the octahedral manganese coordination sites actually have 6-fold MnO6 coordination, the remainder being MnO5 square-based pyramidal sites. The chains of cooperatively twisted apex-linked MnO4 tetrahedra adopt an ordered -LRLR- arrangement within each tetrahedral layer. This is the first published example of a fully refined structure of this type which exhibits such intralayer ordering of the twisted tetrahedral chains. The rationale behind the contrasting structures of La0.33Sr0.67MnO2.42 and other previously reported reduced La1−xSrxMnO3−y phases is discussed. | ||||
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Corporate Author | Thesis | ||||
Publisher | Place of Publication | London | Editor | ||
Language | Wos | 000292718500032 | Publication Date | 2011-05-26 | |
Series Editor | Series Title | Abbreviated Series Title | |||
Series Volume | Series Issue | Edition | |||
ISSN | 0022-4596; | ISBN | Additional Links | UA library record; WoS full record; WoS citing articles | |
Impact Factor | 2.299 | Times cited | 8 | Open Access | |
Notes | Approved | Most recent IF: 2.299; 2011 IF: 2.159 | |||
Call Number | UA @ lucian @ c:irua:90885 | Serial | 3600 | ||
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