Calcium Bismuth Titanate with High Curie Temperature (Tc) for High-Temperature Sensor Applications

Sivagnanapalani, P and Ansari, NI and Panda, PK (2021) Calcium Bismuth Titanate with High Curie Temperature (Tc) for High-Temperature Sensor Applications. Journal of Electronic Materials, 50 (8). pp. 4806-4811. ISSN 03615235

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Abstract

Bismuth layer-structured ferroelectric (BLSF) ceramics exhibit linearity in resistivity with respect to temperature changes, and therefore find application as high-temperature sensor materials. In this study, calcium bismuth titanate (CBT), a BLSF material, was synthesized by calcining combined oxide precursors at 850°C for 2 h, and its particle size distribution, phase analysis, grain size distribution and morphology were characterized. Circular discs were prepared by sintering in the temperature range of 1000 to 1200°C. The sintered discs were characterized for dielectric constant (K), P-E hysteresis loop and DC electrical resistivity (ρ) from 100 to 900°C. The highest density (> 95% Th.) was obtained for samples sintered at 1175°C. DC resistivity decreased linearly from 1014 to 105 Ω cm with the rise in temperature from 100 to 900°C, therefore confirming CBT as a prospective high-temperature sensor material.

Item Type:	Article
Uncontrolled Keywords:	Calcium bismuth titanate (CBT), Bismuth layer-structured ferroelectric (BLSF), High-temperature sensors, Curie temperature, Electrical resistivity
Subjects:	CHEMISTRY AND MATERIALS > Chemistry and Materials (General) CHEMISTRY AND MATERIALS > Composite Materials CHEMISTRY AND MATERIALS > Inorganic, Organic and Physical Chemistry
Depositing User:	Mrs. Usha Kumari
Date Deposited:	20 May 2022 11:16
Last Modified:	20 May 2022 11:16
URI:	http://nal-ir.nal.res.in/id/eprint/13563

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