Negative Thermal Sensitivity of La_1-xSr_xFeO₃ Films Prepared by Screen-Printing Method

Abstract:

The impacts of different Sr content on the phase structure, negative temperature coefficient (NTC) characteristic and conduction mechanism at high temperature of lanthanum strontium ferrite (La_1-xSr_xFeO₃, x=0.1~0.6) (LSFO) films were systematically discussed. The LSFO films were prepared on the alumina substrate by the screen printing method. The results showed that the crystal structure transformed from orthorhombic (x=0.1~0.3) to rhombohedral (x=0.4~0.6). All the samples presented NTC performance. With increasing the Sr content, B values increased to the maximum 3885 K (x=0.4) and then decreased. Non-adiabatic small polaron hopping mechanism was dominant for their electric transport in the temperature range from 450 K to 873 K. The activation energy was calculated between 0.37 eV and 0.57 eV, and the sample La_0.7Sr_0.3FeO₃ showed the minimum value of the activation energy. Therefore the La_1-xSr_xFeO₃ (x=0.3, 0.4, 0.5) films have the potential to be developed into high-performance NTC resistors.

• Periodical: Materials Science Forum (Volume 898)
• Pages: 1617-1624
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.898.1617
• Online since: June 2017
• Authors: Xin De Zhu*, Yu Zhou, Sheng Li Li
• Keywords: Conductive Mechanism, Crystal Structure, Lanthanum Strontium Ferrite Film, Negative Temperature Coefficient, Small Polaronic Hopping

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