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Proceedings Paper

PZT ceramics modified by rare earths as suitable candidates for thermal IR sensors
Author(s): H. D. Sharma; Anil Govindan; A. K. Tripathi; Tara Chand Goel; P. K. C. Pillai
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Paper 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 (pi) 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 pi) increase linearly with temperature. The pyro coefficient (pi) 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.

Paper Details

Date Published: 16 April 1998
PDF: 9 pages
Proc. SPIE 3321, 1996 Symposium on Smart Materials, Structures, and MEMS, (16 April 1998); doi: 10.1117/12.305562
Show Author Affiliations
H. D. Sharma, Indian Institute of Technology (India)
Anil Govindan, Indian Institute of Technology (India)
A. K. Tripathi, Indian Institute of Technology (India)
Tara Chand Goel, Indian Institute of Technology (India)
P. K. C. Pillai, Indian Institute of Technology (United States)

Published in SPIE Proceedings Vol. 3321:
1996 Symposium on Smart Materials, Structures, and MEMS
Vasu K. Aatre; Vijay K. Varadan; Vasundara V. Varadan, Editor(s)

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