(Pb, La)(Zr, Ti)O_3セラミックスの作製とその焦電的性質

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High density lanthanum-modified lead zirconate titanate (PLZT) ceramics with compositions of {(Pb_<0.925>La_<0.075>)(Zr_yTi_<1-y>)_<0.981>O_3+0.5 mass% MnO_2> where y=0-0.10, were synthesized by hot isostatic pressing (HIP). All the pressed samples had the high relative density of 9.99% of theoretical density. The pyroelectric properties of the poled PLZT ceramics with y=0-0.10 were evaluated. The relative dielectric constant ε_r at room temperature was in the range of 290 to 334 and increased linearly with increasing Zr content, while the Curie temperature T_c decreased slightly. The rates of linear increase m_1 and decrease m_2 calculated from the slope of the linear plot of ε_r and T_C with y were approximately 4.0/mol% Zr and 0.6℃/mol% Zr, respectively. Assuming that the volume specific heat C_v of the present samples with y=0-0.10 are 3.2×10^6 J/m^3・K, y=0.10 PLZT sample exhibited the highest figures of merit F.M. for voltage rewponsivity of around 0.20×10^<-12>C・m/J and F.M.D.^* for specific detectivity D^* of around 0.57×10^<-10>C・m/J, among the nine samples studied here. The figure of merit F.M.D^* of y=0.10PLZT sample matched ε_r of element materials with those of field-effect transistors FET used in the sensor circuit was superior to those of PLZT (4/44/56) ceramic and {(1-x)Pb_<0.9>La_<0.1>Ti_<0.975>O_3+xMgO} (PLMT) ceramic with x=0.005 that have been previously reported.
社団法人日本セラミックス協会の論文
1997-04-01

(Pb, La)(Zr, Ti)O_3セラミックスの作製とその焦電的性質

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