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Advances in Materials Science and Engineering
Volume 2009, Article ID 383842, 4 pages
http://dx.doi.org/10.1155/2009/383842
Research Article

NTCR Behavior of La-Doped Ceramics

1Research Center for Materials Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, China
2Department of Information Materials, Guilin Academy of Air Force, Guilin 541004, China

Received 20 August 2009; Accepted 18 October 2009

Academic Editor: Douglas Chrisey

Copyright © 2009 Ying Luo et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The influence of the composition on the microstructure and electrical properties of NTC thermistors was investigated. A single phase of with a monoclinic structure was prepared by solid state reaction method. The relationship between the resistivity and the reciprocal of absolute temperature of the prepared NTC thermistors was linear, indicative of NTC characteristics. The resistivity and the coefficient of temperature sensitivity first decreased with increasing in the range of and then increased with further increase in . However the alpha parameter value increased to a maximum value and then decreased again.