期刊
JOURNAL OF SOLID STATE CHEMISTRY
卷 194, 期 -, 页码 71-75出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jssc.2012.07.035
关键词
gamma-AlON; Mn; Phosphor; Coordination structure; XRD; XAFS
资金
- Ministry of Education, Culture, Science and Technology of Japan [23560853]
- Grants-in-Aid for Scientific Research [23560853] Funding Source: KAKEN
The valence and coordination structure of manganese in a Mn,Mg-codoped gamma-AlON spinel-type oxynitride green phosphor were studied by synchrotron X-ray diffraction and absorption fine structure measurements. The absorption edge position of the XANES revealed the bivalency of Mn. Two cation sites are available in the spinel structure for cation doping: a tetrahedral site and an octahedral site. The pre-edge of the XANES and the distance to the nearest neighbor atoms obtained from the EXAFS measurement showed that Mn was situated at the tetrahedral site. Rietveld analysis showed that the vacancy occupied the octahedral site. The preferential occupation of the tetrahedral site by Mn and the roles of N and Mg are discussed in relation to the spinel crystal structure. (C) 2012 Elsevier Inc. All rights reserved.
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