Electric Properties of Pb(Sb_<1/2>Nb_<1/2>)O_3-PbTiO_3-PbZrO_3 Ceramics Modified with Certain Additives

概要

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Effects of additives on the ceramic and electric properties of Pb(Sb_<1/2>Nb_<1/2>)O_3-PbTiO_3-PbZrO_3 ceramics in a perovskite-type structure were investigated. Addition of small amounts of MnO_2 or NiO increased the sintered density. However, larger amounts of MnO_2 or NiO lowered the sintered density. Small amounts of MnO_2 or NiO promoted the grain growth of the ternary base composition. The microstructure indicated that small amounts of MnO_2 produced a fine, uniform grain structure and addition of NiO produced clearer grain boundaries and larger grain size than MnO_2 addition. The resistivity, dielectric and piezoelectric properties of the base composition were improved markedly through selection of additives in proper amounts. High mechanical quality factor, Q_M (2070), low dielectric dissipation factors (36×10^<-4>) and high radial coupling coefficient, k_p (54%) were obtained by addition of MnO_2.
社団法人応用物理学会の論文
1995-09-30