New phase of BaLaMnO(4-x) formed by annealing in a reducing atmosphere

A single crystal of BaLaMnO(4) with I4/mmm has been synthesized by a floating zone method. A new phase of BaLaMnO(4-x) was obtained by annealing the single crystal in a reducing atmosphere at 773 K for 168 h. The structural change was analyzed by four-circle X-ray diffractometry (XRD) and transmissi...

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Bibliographic Details
Published in:Journal of the Ceramic Society of Japan 2008-01, Vol.116 (1351), p.445-448
Main Authors: Nakano, Hiromi, Kawabata, Norikatsu, Kamegashira, Naoki
Format: Article
Language:English
Online Access:Get full text
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Summary:A single crystal of BaLaMnO(4) with I4/mmm has been synthesized by a floating zone method. A new phase of BaLaMnO(4-x) was obtained by annealing the single crystal in a reducing atmosphere at 773 K for 168 h. The structural change was analyzed by four-circle X-ray diffractometry (XRD) and transmission electron microscopy (TEM). The new phase has an orthorhombic unit cell (Cccm) of a=0.5504(7) nm, b=0.5502(5) nm, and c=1.3265(1) nm. The structural change from I4/mmm into Cccm was caused by an oxygen deficiency, and a small amount of Mn(2+) ions was formed by annealing in a reducing atmosphere.
ISSN:1882-0743
DOI:10.2109/jcersj2.116.445