Strongly reduced band gap in NiMn2O4 due to cation exchange

Jhih Rong Huang, Han Hsu, Ching Cheng

研究成果: 雜誌貢獻期刊論文同行評審

7 引文 斯高帕斯(Scopus)

摘要

NiMn2O4 is extensively used as a basis material for temperature sensors due to its negative temperature coefficient of resistance (NTCR), which is commonly attributed to the hopping mechanism involving coexisting octahedral-site Mn4+ and Mn3+. Using density-functional theory + Hubbard U calculations, we identify a ferrimagnetic inverse spinel phase as the collinear ground state of NiMn2O 4. By a 12.5% cation exchange, a mixed phase with slightly higher energy can be constructed, accompanied by the formation of an impurity-like band in the original 1 eV band gap. This impurity-like band reduces the gap to 0.35 eV, suggesting a possible source of NTCR.

原文???core.languages.en_GB???
頁(從 - 到)149-152
頁數4
期刊Journal of Magnetism and Magnetic Materials
358-359
DOIs
出版狀態已出版 - 5月 2014

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