Conductivity mechanism analysis at high temperature in bismuth titanate: A single crystal with sillenite-type structure

Lanfredi, S.; Nobre, M. A. L.
February 2005
Applied Physics Letters;2/21/2005, Vol. 86 Issue 8, p081916
Academic Journal
Conductivity behavior of the Bi12TiO20 single crystal was investigated by the electric modulus spectroscopy, which was carried out in the frequency range from 5 Hz to 13 MHz and at temperatures higher than 400 °C. The resistance curve exhibits a set of properties correlated to a negative temperature coefficient thermistor. In the temperature range investigated, the characteristic parameter (β) of the thermistor is equal to 4834 °C. Temperature coefficients of the resistance (α) were derived being equal to -3.02×10-2 °C-1 at 400 °C and equal to -9.86×10-3 °C-1 at 700 °C. The nature of the electric relaxation phenomenon and magnitude dc conductivity are approached.


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