Structure and dielectric relaxation behaviors of Co-doped YMnO3 multiferroic ceramics

被引:8
作者
Wan, Feng [1 ,2 ]
Li, Leilei [2 ,3 ,4 ]
Bai, Xiaojun [2 ,3 ,4 ]
Wang, Yaocen [2 ,3 ,4 ]
Gao, Lei [2 ,7 ,8 ]
Li, Jinlin [5 ,6 ]
Cao, Chongde [2 ,3 ,4 ]
机构
[1] Xianyang Normal Univ, Coll Phys Elect Engn, Xianyang 712000, Peoples R China
[2] Northwestern Polytech Univ, MOE Key Lab Mat Phys & Chem Extraordinary Condit, Xian 710072, Peoples R China
[3] Northwestern Polytech Univ, Shaanxi Key Lab Condensed Matter Struct & Propert, Sch Phys Sci & Technol, Xian 710072, Peoples R China
[4] Northwestern Polytech Univ, Inst Res & Dev, Shenzhen 518057, Peoples R China
[5] Xian Univ Technol, Sch Mat Sci & Engn, Xian 710048, Peoples R China
[6] Guangdong Acad Sci, Inst New Mat, Guangzhou 510650, Peoples R China
[7] Baotou Res Inst Rare Earth, Baotou 014030, Peoples R China
[8] State Key Lab Baiyunobo Rare Earth Resource Res &, Baotou 014030, Peoples R China
基金
中国国家自然科学基金;
关键词
ELECTRICAL-PROPERTIES; SUBSTITUTION;
D O I
10.1007/s10854-022-08613-y
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
Rare-earth manganite YMnO3 have attracted much attention due to the simultaneous existence of ferroelectricity and magnetism in the same phase. In the present work, we report the results of the studies on the structural and dielectric relaxation behaviors of YMn1-xCoxO3 (x = 0.00, 0.03, 0.05, and 0.07) ceramics synthesized by conventional solid-state reaction method. The X-ray diffraction patterns confirm the existence of a single phase in YMn1-xCoxO3 with hexagonal structure belonging to P6(3)cm space group. A shifting of Raman-active phonon modes toward lower frequencies has been observed upon Co substitution. The structural morphologies analysis from the scanning electron microscope indicates a decrease in average grain size from 2.20 to 1.90 mu m with increasing Co content in the system. The dielectric constant and dielectric loss decrease with the increase of frequency at the temperature between 350 and 650 K and exhibit typical relaxation behaviors. It was a thermally activated process and the dielectric loss peak obeys Arrhenius law. This relaxation is attributed to the pinning effect of the local electric field generated by the dipole on the domain wall due to Co doping in the system. Oxygen vacancies are suggested to be responsible for the dielectric constant decrease with doping at the temperature above 700 K.
引用
收藏
页码:17361 / 17371
页数:11
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