PZT ceramics modified by rare earths as suitable candidates for thermal IR sensors

H. D. Sharma; Anil Govindan; A. K. Tripathi; Tara Chand Goel; P. K. C. Pillai

doi:10.1117/12.305562

16 April 1998 PZT ceramics modified by rare earths as suitable candidates for thermal IR sensors

H. D. Sharma, Anil Govindan, A. K. Tripathi, Tara Chand Goel, P. K. C. Pillai

Proceedings Volume 3321, 1996 Symposium on Smart Materials, Structures, and MEMS; (1998) https://doi.org/10.1117/12.305562
Event: Smart Materials, Structures and MEMS, 1996, Bangalore, India

Abstract

This paper reports the structural, dielectric and pyroelectric properties of PZT ceramics modified by 5% rare earths i.e. La³⁺, Ce³⁺, Nd³⁺, Sm³⁺, Eu³⁺ and Gd³⁺. Out of these PLZT and PGZT were in tetragonal phase. The lattice volume decreases as rare earths ionic radii decreases except PEZT and PGZT. Dielectric constant is found to increase with temperature but decreases with frequencies. The value of tan(delta) , however, decreases up to 80 degree(s)C and the increases slightly. The pyrocurrents (p) as well as pyrocoefficients (p_i) increase with temperature up to 50 degree(s)C and then remains constant up to 80 degree(s)C. Above 80 degree(s)C (p and p_i) increase linearly with temperature. The pyro coefficient (p_i) and figures of merit of these ceramics are comparable to other thermal IR sensor materials. The preparation of these ceramics is relatively simple, inexpensive and properties can be tailored according to the desirable characteristics of the sensors. The results of the studies have shown that these ceramics would be very useful for the development of thermal IR sensors.

Citation Download Citation

H. D. Sharma, Anil Govindan, A. K. Tripathi, Tara Chand Goel, and P. K. C. Pillai "PZT ceramics modified by rare earths as suitable candidates for thermal IR sensors", Proc. SPIE 3321, 1996 Symposium on Smart Materials, Structures, and MEMS, (16 April 1998); https://doi.org/10.1117/12.305562

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