La及びMgを添加したPbTiO_3セラミックスの作製とその焦電特性

概要

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Lanthanum and magnesium modified PbTiO_3 (PLMT) ceramics were prepared by normal sintering using pure PbTiO_3 as a packing powder for the crucible. The physical and pyroelectric properties of PLMT ceramics obtained were investigated in detail. The PLMT ceram ic of y = 0.005 having the tetragonal perovskite struc ture was found to be a rather dense sintered body con sisting of average grain size of around 1.2 μm as con cluded from SEM observation. The Curie point for all samples shifted slightly to the lower temperature side with increasing amount of Mg^<2+> ion addition. The PLMT ceramics of y = 0.005 exhibited the largest pyro electric coefficient of 1.8×10^<-8> C/cm^2.K, which was nearly equal to that of PbTi0_3 system ceramics. The Cu rie constant and the Curie Weiss temperature for PLMT samples were estimated as C= (2.1 2.6)×10^5℃ and T_0=280 299℃, respectively.
社団法人日本セラミックス協会の論文
1994-11-01