High-pressure synthesis and crystal structure analysis of NaMn{sub 2}O{sub 4} with the calcium ferrite-type structure
Journal Article
·
· Journal of Solid State Chemistry
- National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565 (Japan)
- Department of Applied Electronics, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510 (Japan)
Single crystals of a new sodium manganese oxide, NaMn{sub 2}O{sub 4}, were synthesized for the first time using a high-temperature and high-pressure technique. The NaMn{sub 2}O{sub 4} single crystal is black, has a needle shape, and crystallizes in the orthorhombic calcium ferrite-type structure, space group Pnam with a=8.9055(18)A, b=11.0825(22)A, c=2.8524(5)A, V=281.52(9)A{sup 3}, and Z=4. The structure was determined from a single-crystal X-ray study and refined to the conventional values R=0.041 and wR=0.034 for 1190 observed reflections. The framework structure is built up from edge-sharing chains of MnO{sub 6} octahedra that condense to form one-dimensional tunnels in which the sodium atoms are located. The Mn-O bond distance and bond valence analyses revealed the manganese valence Mn{sup 3+}/Mn{sup 4+} ordering in the two 'double rutile' chains of NaMn{sub 2}O{sub 4}.
- OSTI ID:
- 20784846
- Journal Information:
- Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 1 Vol. 179; ISSN 0022-4596; ISSN JSSCBI
- Country of Publication:
- United States
- Language:
- English
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