(La_<1-x>Sr_x)MnO_3の共沈法による合成

概要

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A coprecipitate of the carbonate was first obtained by the titration of sodium carbonate into solution in which MnO, SrCO_3, and La_2O_3 were dissolved by hydrochloric acid. Heating the coprecipitate for 1 h at 600℃, 7 h at 1000℃, and successively 10 h at 1300℃ produced a sintered body of(La_<1-x>Sr_x)MnO_3, which was observed by electron microscopy and analyzed by X-ray powder diffratometory. As a result, it was clarified that the coprecipitation method enables to obtain the single phase in the range of x=0.4-0.6, which is not possible by the dry process. Even in the range x=0.2-0.4, where both the methods enable to obtain the single phase, the samples prepared by the coprecipitation method had better homogeneity and smaller compositional fluctuation than these prepared dry method.
社団法人日本セラミックス協会の論文
1998-12-01