Preparation and Properties of Pb[(Sc_<1/2>Nb_<1/2>)_<0.575>Ti_<0.425>]O_3 Ceramics (<Special Issue> FERROELECTRIC MATERIALS AND THEIR APPLICATIONS)

概要

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Pb[(Sc_<1/2>Nb_<1/2>)_<0.575>Ti_<0.425>]O_3 (PSNT) was prepared by the two-step calcining method. The sintering conditions for PSNT ceramics were investigated in the temperature range of 1200 to 1300℃. The density of PSNT fired at 1300℃ was 7.5 g/cm^3, which was in the range of 93% of the theoretical value. The dielectric constant and tan δ were 1760 and 0.022, respectively. The pyroelectric coefficient of this ceramic sample was 50 nC/cm^2 K, which is larger compared with other well-known pyroelectric materials. The spontaneous polarization P_s calculated by the pyroelectric current method showed a typical diffuse phase transition and its value was 28 μC/cm^2 at room temperature. Large coupling factors of k_p=51% and k_t=53% were obtained.
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1994-09-30