The results of this study are summarized as follows:
(1) High density lanthanum-modified lead zirconate titanate (PLZT) ceramics with compositions of {(Pb
0.925La
0.075)(Zr
yTi
1-y)
0.981O
3+0.5 mass% MnO
2}, where
y=0-0.10, were successfully synthesized by hot isostatic pressing.
(2) All the pressed samples had the high relative density of 99.9% of theoretical density.
(3) The relative dielectric constant ε
r at room temperature was in the range of 290 to 334 which was satisfactory for requirements of maintaining appropriately low ε
r(-350).
(4) The rates of linear increase
m1 and decrease
m2 calculated from the slope of the linear plot of ε
r and the Curie temperature
TC with
y were approximately 4.0/mol% Zr and 0.6°C/mol% Zr, respectively.
(5) Assuming that the volume specific heat
Cv of the PLZT samples with
y=0-0.10 are 3.2×10
6J/m
3·K,
y=0.10 PLZT sample exhibited the highest figures of merit F.M. for voltage responsivity of around 0.20×10
-12C·m/J and F.M.D* for specific detectivity D* of around 0.57×10
-10C·m/J, among the nine samples studied here.
(6) The figure of merit F.M.D* of
y=0.10 PLZT sample matched ε
r of element materials with those of FET used in the sensor circuit was superior to those of PLZT(4/44/56) ceramic and
x=0.005 PLMT ceramic that have been previously reported.
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