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Home  >  Journal list  >  Journal of the Ceramic Society of Japan  >  Vol.116  No.1351 (March) (2008)  >  pp.445-448

Journal of the Ceramic Society of Japan
<<Previous article Vol.116  No.1351 (March) (2008)   pp.445 - 448 Next article>>

New phase of BaLaMnO4-x formed by annealing in a reducing atmosphere

Hiromi NAKANO1), Norikatsu KAWABATA2) and Naoki KAMEGASHIRA2)
1) Ryukoku University
2) Toyohasi University of Technology


  A single crystal of BaLaMnO4 with I4/mmm has been synthesized by a floating zone method. A new phase of BaLaMnO4-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 Mn2+ ions was formed by annealing in a reducing atmosphere.



Keyword:
Rare earth manganite, Structure, Transmission electron microscopy, X-ray diffractometry, Nonstoichiometory

Received: December 11, 2007
Accepted: January 17, 2008 , Published online: March 01, 2008
Copyright (c) 2008 The Ceramic Society of Japan

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