Journal
CHEMISTRY OF MATERIALS
Volume 25, Issue 2, Pages 178-183Publisher
AMER CHEMICAL SOC
DOI: 10.1021/cm303182u
Keywords
A-site-ordered perovskites; high-pressure synthesis; resonant X-ray diffraction; magnetic properties; valence states of cations
Funding
- Global COE Program International Center for Integrated Research and Advanced Education in Materials Science [B-09]
- Project of Integrated Research on Chemical Synthesis from the Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan
- JST CREST program
- EPSRC
- Leverhulme Trust, United Kingdom
- [19GS0207]
- [22740227]
- Grants-in-Aid for Scientific Research [11J00196, 22740227] Funding Source: KAKEN
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A-site-ordered perovskites La1-xNaxMn3Ti4O12 with (x = 0, 0.5, 1) were synthesized under high-pressure and high-temperature conditions, and their crystal structures and magnetic properties were investigated. Ti/Mn occupancies at the B site were also examined by using resonant X-ray diffraction, and the results confirm that they are stoichiometric with high Ti/Mn site selectivity. Substitution of Na+ for some of the La3+ changes the valence state of the A'-site Mn but not of the B-site Ti, and thus the compositions of the synthesized samples are expressed as La1-xNaxMn3{(5+2x)/3}+Ti44+O12. The magnetic properties change from spin-glass-like to antiferromagnetic to spin-glass-like behavior according to the valence states of A'-site Mn.
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