Improvement in the electrical stability of Mn-Ni-Co-O NTC thermistors by substituting Cr2O3 for Co3O4

K. Park, J. K. Lee, J. G. Kim, Sahn Nahm

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

The as-sintered Mn1.1Ni1.4Co0.5-xCrxO4 (0 ≤ x ≤ 0.35) samples were crystallized in a cubic spinel Mn- and Ni-rich oxides. The substituted Cr led to a significant decrease in the resistivity change of the Mn1.1Ni1.4Co0.5-xCrxO4 negative temperature coefficient (NTC) thermistors after the thermal constraint. This indicates that the Cr-substituted Mn1.1Ni1.4Co0.5-xCrxO4 NTC thermistors have good electrical stability in comparison to the Cr-free Mn1.1Ni1.4Co0.5O4 thermistors. We strongly propose that the Cr substitution is highly desirable for the fabrication of stable high-performance NTC thermistors.

Original languageEnglish
Pages (from-to)211-214
Number of pages4
JournalJournal of Alloys and Compounds
Volume437
Issue number1-2
DOIs
Publication statusPublished - 2007 Jun 28

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Thermistors
Oxides
Substitution reactions
Fabrication

Keywords

  • CrO
  • Electrical resistivity
  • Electrical stability
  • Microstructure
  • Mn-Ni-Co-O
  • NTC thermistors

ASJC Scopus subject areas

  • Metals and Alloys

Cite this

Improvement in the electrical stability of Mn-Ni-Co-O NTC thermistors by substituting Cr2O3 for Co3O4 . / Park, K.; Lee, J. K.; Kim, J. G.; Nahm, Sahn.

In: Journal of Alloys and Compounds, Vol. 437, No. 1-2, 28.06.2007, p. 211-214.

Research output: Contribution to journalArticle

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AB - The as-sintered Mn1.1Ni1.4Co0.5-xCrxO4 (0 ≤ x ≤ 0.35) samples were crystallized in a cubic spinel Mn- and Ni-rich oxides. The substituted Cr led to a significant decrease in the resistivity change of the Mn1.1Ni1.4Co0.5-xCrxO4 negative temperature coefficient (NTC) thermistors after the thermal constraint. This indicates that the Cr-substituted Mn1.1Ni1.4Co0.5-xCrxO4 NTC thermistors have good electrical stability in comparison to the Cr-free Mn1.1Ni1.4Co0.5O4 thermistors. We strongly propose that the Cr substitution is highly desirable for the fabrication of stable high-performance NTC thermistors.

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