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Crystal growth and structural refinement of NaMn 7 O 12
Author(s) -
Gilioli E.,
Licci F.,
Calestani G.,
Prodi A.,
Gauzzi A.,
Salviati G.
Publication year - 2005
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.200410489
Subject(s) - manganite , crystallography , crystal structure , charge ordering , perovskite (structure) , materials science , crystal (programming language) , phase (matter) , single crystal , chemistry , charge (physics) , condensed matter physics , ferromagnetism , physics , organic chemistry , quantum mechanics , computer science , programming language
We report the crystal growth and the structural refinement of NaMn 7 O 12 , a manganite having a double perovskite structure. As in many similar compounds, there is coexistence of Mn 3+ and Mn 4+ but in this material they orderly occupy different sites for crystallographic reasons. Therefore, this peculiar structure can be considered as a model system for studying complex mechanisms such as charge, orbital and spin ordering. High purity bulk samples and “large” single crystals are needed to study tiny modifications in the crystallographic and magnetic structures associated to the ordering phenomena. Almost single phase (more than 96% pure) and single crystals (up to about 150 µm) of NaMn 7 O 12 were synthesized by solid state reaction under pressure in a multi‐anvil apparatus. Single crystal x‐ray diffraction and SEM analysis have been used to characterize the crystals. The structure refinement indicates that NaMn 7 O 12 crystallizes in the cubic Im3 space group, with a = 7.312 Å and Z = 2. Further studies are in progress to optimize the synthesis conditions, in order to grow larger crystals. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)