Piezoelectricity in Ceramics of Ferroelectric Bismuth Compound with Layer Structure

概要

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Piezoelectric properties have been studied on ferroelectric ceramics comprising bismuth compounds with layer structure, PbBi_2Nb_2O_9, PbBi_4Ti_4O_<15>, SrBi_4Ti_4O_<15> and Na_<0.5>Bi_<4.5>Ti_4O_<15>. These ceramics have the high mechanical quality factor Q(2000〜7200), low aging rate of frequency constant N_t(30〜60 ppm/time decade), low temperature coefficients both of N_t(-50 ppm/℃) and of coupling factor k_t(70 ppm/℃), low Poisson's ratio σ(0.23〜0.27), and large anisotropy in coupling factor. A small value of k_t in these ceramics probably relates to two-dimensional restriction on permissible rotation of the spontaneous polarization. The poling characteristics in the ceramics can be improved by some additives. Grain boundaries in these ceramics are of nearly rectangular shape, and an etch pattern of fine stripes appears always in parallel to the length of the boundary.
社団法人応用物理学会の論文
1974-10-05