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Mn-doped La0.1Sr0.9TiO3 for intermediate temperature NTC thermistor applications

  • Department of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, China

Cite this: JUSTC, 2009, 39(4): 371-374
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  • Received Date: June 29, 2008
  • Revised Date: November 11, 2008
  • Published Date: April 29, 2009
    Abstract
  • To explore perovkite-structured oxides for negative temperature coefficient (NTC) thermistor applications, La0.1Sr0.9TiO3 was doped by Mn. It was found that partial substitution of Ti by Mn in La0.1Sr0.9TiO3 can result in a drastic decrease in electrical resistivity ρ and thermal constant B. For La0.1Sr0.9Ti0.9Mn0.1O3, ρ at 300 ℃ was measured to be 30×102 Ω·m, and B was 5 900 K, which are all much smaller than those for the undoped sample (ρ=98×104 Ω·m, B=13 000 K). Mn doping also inhibited the drift in electrical resistivity with time. The improved electrical properties are attributed to the presence of Mn3+—O—Ti4+ network in the Mn-doped materials. The Mn-doped La0.1Sr0.9TiO3 may be used as intermediate temperature NTC thermistors.
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