Magnetic characterization and charge state of nonmagnetic ion-substituted YMn0.8Fe0.2O3
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The structure, magnetic properties and charge state of Al/Bi-substituted YMn0.8Fe0.2O3 were investigated. The Y(Mn0.8Fe0.2)0.95Al0.05O3 and Y0.95Bi0.05Mn0.8Fe0.2O3 solid solutions all exhibited the hexagonal P63cm space group, similar to YMnO3. The magnetic structures of Al-substituted YMn0.8Fe0.2O3 were not uniform, and were predominantly antiferromagnetic with weak ferromagnetic properties at low temperatures. The ratios Mn2+:Mn3+ and Fe2+:Fe3+ noticeably decreased upon Al substitution in YMn0.8Fe0.2O3, and the magnetic transition temperature was reduced dramatically. The cluster glass state behavior observed in Y(Mn0.8Fe0.2)0.95Al0.05O3 was absent in the case of Y0.95Bi0.05Mn0.8Fe0.2O3, which indicated weakened ferromagnetic interactions in the latter. This may be related to the decreased oxygen content in Y0.95Bi0.05Mn0.8Fe0.2O3. Bismuth substitution can strengthen the antiferromagnetic interactions in YMn0.8Fe0.2O3.
The present work financially supported by China Scholarship Council (CSC, No. 201708420003), the National Natural Science Foundation of China (Nos. 51202169 and 51672195), and the Youth Found of the State Key Laboratory of Refractories and Metallurgy (No. 2016QN12). The authors would acknowledge Professor Gary J. Cheng in Purdue University for his kind help in paper writing.
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