DIELECTRIC , FERROELECTRIC AND PIEZOELECTRIC PROPERTIES OF La 3 + SUBSTIUTED PZT CERAMICS
نویسنده
چکیده
Lanthanum substituted lead zirconate titanate (PLZT) nanocrystallite with stichometry formula Pb0.90La0.10 (Zr0.52Ti0.48) O3 have been synthesized by sol gel process. The effect of nanocrystallite on dielectric, ferroelectric and piezoelectric properties of La substituted PZT was studied. The average crystallite size of the PLZT powder was 21nm.Variation of dielectric constant with temperature at 100 kHz frequency was studied. Dielectric constant (ε) of PLZT (10/52/48) pellet at Curie temperature (~2880c) was found to be 10437. The ferroelectric hysteresis (P-E) loop of PLZT ceramic was studied as a function of applied electric voltage. Study of variation of piezoelectric coefficient (d33) of PLZT pellet with varying polling field shows maximum d33 value was124pC/N at 40kv/cm.
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