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Synthesis and crystal structure of K2NiF4-type novel Gd1+xCa1-xAlO4-xNx oxynitrides

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Title: Synthesis and crystal structure of K2NiF4-type novel Gd1+xCa1-xAlO4-xNx oxynitrides
Authors: Masubuchi, Yuji Browse this author →KAKEN DB
Hata, Tomoyuki Browse this author
Motohashi, Teruki Browse this author
Kikkawa, Shinichi Browse this author
Keywords: Inorganic materials
Rare earth alloys and compounds
Solid state reactions
Crystal structure
Synchrotron radiation
X-ray diffraction
Issue Date: 5-Jan-2013
Publisher: Elsevier science sa
Journal Title: Journal of alloys and compounds
Volume: 582
Start Page: 823
End Page: 826
Publisher DOI: 10.1016/j.jallcom.2013.08.140
Abstract: Novel gadolinium calcium aluminum oxynitrides, Gd1+xCa1-xAlO4-xNx, were prepared in x = 0.15-0.25 by the solid state reaction of a nitrogen-rich mixture with AlN as an aluminum source; the mixture was sintered twice at 1500 degrees C for 5 h under 0.5 MPa of nitrogen gas. Shift in the optical absorption edge was observed in their diffuse reflectance spectra from 4.46 eV for the oxide (x = 0) to 2.94 eV for the oxynitride at x = 0.2. The crystal structure of Gd1.2Ca0.8AlO3.8N0.2 at x = 0.2 was refined using a synchrotron X-ray diffraction data as a layered K2NiF4-type structure with the I4mm space group. Longer Al-O/N bond lengths in the oxynitride than those in GdCaAlO4 suggest that the nitride ions are in the apical site of aluminum polyhedron, similar to those in Nd2AlO3N. (c) 2013 Elsevier B.V. All rights reserved.
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 鱒渕 友治

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