Effect of Fe incorporation on cation distributions and hopping conductions in Ni-Mn-Co-O spinel oxides

Hyuk Su Han, Kyoung Ryeol Park, Yu Rim Hong, Kwangbo Shim, Sungwook Mhin

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Abstract

Effect of Fe incorporation on electrical properties of (NixCoyMn3-x-y)O4 (NMC) spinel compound is investigated for the application to a negative temperature coefficient (NTC) thermistor. Cation distribution of the Fe doped NMC (FNMC) is calculated based on the size of ions located at tetragonal A sites and octahedral B sites in spinel structure, which can be closely related with temperature dependent electrical properties of the FNMC. With change of Fe contents, the ratio of Mn3+/Mn4+ in octahedral B site of FNMC is changed which can determine the temperature sensitivity factor (B-value). Hopping conduction mode relating with activation energy and hopping distance was also discussed depending on Fe contents, based on the small polaron hopping theory.

Original languageEnglish
Pages (from-to)486-490
Number of pages5
JournalJournal of Alloys and Compounds
Volume732
DOIs
Publication statusPublished - 2018 Jan 25

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Keywords

  • Fe-Ni-Mn-Co-O
  • Hopping conduction
  • Spinel oxide
  • Thermistors

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