摘要
采用低温固相法制备Y_(0.85)Ce_(0.15)Mn_(0.8)Fe_(0.2)O_3粉体,经高温烧结制得陶瓷,研究了Ce、Fe共置换对锰酸钇陶瓷的微结构和磁学性能的影响。采用XRD对Y_(0.85)Ce_(0.15)Mn_(0.8)Fe_(0.2)O_3粉体和陶瓷进行物相分析,利用TEM和FESEM对样品进行显微形貌分析;同时研究了Y_(0.85)Ce_(0.15)Mn_(0.8)Fe_(0.2)O_3陶瓷的磁学性能,并利用XPS分析了其中磁性离子的价态分布。结果表明,前驱体经800℃煅烧后可制得单相Y_(0.85)Ce_(0.15)Mn_(0.8)Fe_(0.2)O_3纳米粉体;该粉体经1450℃烧结制得致密的Y_(0.85)Ce_(0.15)Mn_(0.8)Fe_(0.2)O_3陶瓷,其反铁磁转变温度为29 K,在低温下存在反铁磁有序;与YMn_(0.8)Fe_(0.2)O_3相比,Y_(0.85)Ce_(0.15)Mn_(0.8)Fe_(0.2)O_3中Fe2+含量降低,Mn离子的混价结构由Mn^(2+)/Mn^(3+)转变为Mn^(3+)/Mn^(4+),陶瓷的磁性转变温度降低。
Y_(0.85)Ce_(0.15)Mn_(0.8)Fe_(0.2)O_3 powders were synthesized by low-temperature solid state method and ceramics were obtained after high-temperature sintering. The microstructure and magnetic properties of Ce,Fe co-substituted YMn O3 ceramics were investigated. The phase constitution of Y_(0.85)Ce_(0.15)Mn_(0.8)Fe_(0.2)O_3 powders and ceramics were characterized by XRD,and the particle morphologies of samples were observed by FESEM and TEM. The magnetic property of Y_(0.85)Ce_(0.15)Mn_(0.8)Fe_(0.2)O_3 ceramics was investigated and the valence distributions of magnetic ions were analyzed by XPS. The results show that Y_(0.85)Ce_(0.15)Mn_(0.8)Fe_(0.2)O_3 nano-crystal powders in single phase were synthesized after being calcined at 800℃ and the dense ceramics were obtained after being sintered at 1450 ℃. The Neel temperature of Y_(0.85)Ce_(0.15)Mn_(0.8)Fe_(0.2)O_3 ceramics was approximately 29 K and the antiferromagnetic order existed at low temperature. Compared with YMn_(0.8)Fe_(0.2)O_3,the content of Fe^(2+) in Y_(0.85)Ce_(0.15)Mn_(0.8)Fe_(0.2)O_3 ceramics decreased and the mixed valence structure of Mn ions changed from Mn^(2+)/ Mn^(3+) to Mn^(3+)/ Mn^(4+). In addition,the magnetic transition temperature of the ceramics was reduced by Ce substitution.
出处
《人工晶体学报》
EI
CAS
CSCD
北大核心
2015年第12期3504-3508,共5页
Journal of Synthetic Crystals
基金
国家自然科学基金(51202169)
973计划前期研究专项(2014CB660802)
关键词
低温固相法
YMnO3
磁学性能
晶体结构
low-temperature solid state method
YMnO3
magnetic property
crystal structure
