Sughrue, Mion, Zinn, Macpeack & Seas, PLLC
Manganese-containing complex oxide, and process for preparing complex perovskite compound composition by use of this complex oxide
 There are herein disclosed a raw material for a complex perovskite ceramic composition which is intended to uniformly disperse a trace amount of an addition component (manganese) therein, and a process for preparing the ceramic composition. A manganese-containing composite oxide is represented by the general formula (Mn.sub.a MeI.sub.1-a)MeII.sub.b O.sub.c wherein a is a value in the range of 0<a.ltoreq.0.3; MeI is at least one of Mg, Ni and Zn; MeII is one of Nb, Ta and W; when MeII is Nb or Ta, b is 2 and c is 6, or when MeII is W, b is 1 and c is 4. By the use of a raw material containing this manganese-containing complex oxide, there can be prepared an Mn-containing complex perovskite compound composition which contains Mn and at least one of complex perovskite compounds represented by the general formula Pb(BIBII)O.sub.3 wherein BI is one of Mg, Ni and Zn; and BII is one of Nb, Ta and W. 
NEC Corporation
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Tadahiko Hiroshi Atsushi Shinji Toru
Horiguchi Ishikawa Ochi Ito Mori