Journal
CERAMICS INTERNATIONAL
Volume 44, Issue 1, Pages 339-342Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2017.09.178
Keywords
Lanthanum chromite; Double exchange interactions; Superexchange interactions; Mixed valent state
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Funding
- National Natural Science Foundation of China [11674115, 11674086, 11104065, 11547191, 51402094]
- Postdoctoral Science Foundation of China [2013M542008]
- Hubei Provincial Department of Science Technology [2015CFB549, 2015CFB397]
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Single-phase LaCr0.7Cu0.3O3 ceramics was fabricated successfully using high pressure sintering method. A mixed valent state with the coexistence of Cr2+, Cr3+ and Cr4+ was confirmed by X-ray photoelectron spectroscopy measurement. Magnetic measurement results indicate that in addition to antiferromagnetic superexchange interaction of Cr3+-O2--Cr3+ accompanied by weak ferromagnetism at high temperature, two types of short-range order ferromagnetism can be observed at low temperature, which could be attributed to double exchange interactions of Cr2+ -O2- -Cr3+ and Cr3+ -O2- -Cr4+, respectively. The results here would enrich the understanding on magnetic interactions in rare-earth chromites.
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