New negative temperature coefficient thermistor ceramics in Mn-doped CaCu3-xMnxTi4O12 (0≤x≤1) system

Bo Zhang, Qing Zhao, Aimin Chang*, Haitao Ye, Shi Chen, Yiquan Wu

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

New negative temperature coefficient (NTC) ceramics based on CaCu 3-xMnxTi4O12 (0≤x≤1) compositions have been investigated. The grain size of the CaCu 3-xMnxTi4O12 samples decreases at first and then increases with increasing Mn content. The X-ray photoelectron spectroscopy analysis corroborates the presence of Mn3+ and Mn 4+ in Mn-doped samples, which results in a decrease in the activation energy. All the NTC thermistors prepared show a linear relationship between the natural logarithm of the resistivity and the reciprocal temperature, indicative of NTC characteristics. The Mn-doped CaCu3-xMnxTi 4O12 NTC thermistors provide various electrical properties, depending on Mn content. The values of ρ25, B constant and activation energy of the NTC thermistors are in the range of 2.22×106-3.22×108 Ω cm, 5488-8031 K, and 0.473-0.692 eV, respectively.

Original languageEnglish
Pages (from-to)11221-11227
Number of pages7
JournalCeramics International
Volume40
Issue number7 Part B
Early online date4 Apr 2014
DOIs
Publication statusPublished - Aug 2014

Keywords

  • C. electrical properties
  • D. Perovskites
  • NTC thermistors
  • CaCu3Ti4O12

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