Study on the Magnetic and Ferroelectric Properties of Ca-Doped and (Eu, Ca)Co-doped BiFeO3
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The present work addresses the influence of Ca doping and (Eu, Ca) co-doping into BiFeO3 on its corresponding structural, magnetic, and ferroelectric properties. XRD results show that Bi site doped with Ca and Eu could result in a transition of crystal structure. Analysis of magnetic hysteresis data reveals a further enhancement of magnetism in the (Eu, Ca)co-doped samples which is explained by the structural distortions and the magnetically active characteristic of Eu3+ ions. High remnant polarization at room temperature was observed in the Bi1−0.05−y Eu0.05Ca y FeO3 samples by measuring the electric hysteresis loops due to Eu doping suppressing the formation of Fe2+ and oxygen vacancies.
KeywordsBiFeO3 Sol–gel method Multiferroics
We acknowledge the financial support from the Ministry of Education of China (No. IRT1148), the National Natural Science Foundation of China (Nos. 51372119, 61377019, 61136003, and 51173081), the College Postgraduate Research and Innovation Project of Jiangsu Province (Nos. KYLX_0794 and KYLX15_0848), the Natural Science Foundation of Jiangsu (No. KZ0070715050), the Seed Project Funded by Introducing Talent of NJUPT (No. XK0070915022), and the Natural Science Foundation of NJUPT (Nos. NY214129, NY214130, NY214181, and NY215176).