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Multifunctional cryogenic sensors from n-BaTiO3 ceramics having strong negative temperature coefficient of resistance

Kutty, TRN and Hari, NS (1995) Multifunctional cryogenic sensors from n-BaTiO3 ceramics having strong negative temperature coefficient of resistance. In: Journal of Physics D: Applied Physics, 28 (2). pp. 371-374.

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Official URL: http://iopscience.iop.org/0022-3727/28/2/021

Abstract

Donor-doped n-BaTiO3 polycrystalline ceramics show a strong negative temperature coefficient of resistivity below the orthorhombic-rhombohedral phase transition point, from 10(2-3) Omega cm af 190 K to 10(10-13) Omega cm at less than or similar to 50 K, with thermal coefficient of resistance alpha = 20-23% K-1. Stable thermal sensors for low-temperature applications are realized therefrom. The negative temperature coefficient of resistivity region can be modified by substituting isovalent ions in the lattice. Highly nonlinear current-voltage (I-V) curves are observed at low temperatures, with a voltage maximum followed by the negative differential resistance. The I-V curves are sensitive to dissipation so that cryogenic sensors can be fabricated for liquid level control, flow rate monitoring, radiation detection or in-rush voltage limitation.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Institute of Physics.
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Date Deposited: 02 Jun 2011 04:26
Last Modified: 02 Jun 2011 04:26
URI: http://eprints.iisc.ernet.in/id/eprint/38120

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