Ho3+离子在BaTiO3陶瓷中自补偿模式探索及反常介电性质

采用冷压陶瓷技术制备(Ba_1-xHo_x)(Ti_1-xHo_x)O₃（简称BHTH）陶瓷. 通过X射线衍射（XRD）、电子顺磁共振（EPR）和介电温谱技术研究了BHTH陶瓷的结构、位占据和介电性质. 结果表明：Ho³⁺离子在BaTiO₃陶瓷中能够形成自补偿模式，且具有轻微的Ba位占据倾向. 在BHTH陶瓷中，固溶度为x = 0.03. BHTH陶瓷的介电行为表现出一个反常现象：随着x从0.01增至0.03，居里温度TC向高温移动，即T_C从128℃升到131℃. BHTH晶体结构的四方度（c/a）随着x增加是T_C向高温移动的主要原因.

Abnormal Dielectric Properties and Exploration of Self-compensation Mode of Ho~(3+) in BaTiO_3 Ceramics

(Ba_1-xHo_x)(Ti_1-xHo_x)O₃ceramics (BHTH) were prepared using the cold-pressing ceramic technique. The structure, site occupations, and dielectric properties of BHTH were investigated using X-ray diffraction (XRD), electron paramagnetic resonance (EPR) and dielectric-temperature measuring techniques. The results indicated that Ho³⁺ ions in the BaTiO₃ lattice could form a self-compensation mode with a slight Ba-site-occupation preference. The solubility limit was determined to be x = 0.03 in BHTH. The dielectric behavior of BHTH showed an abnormal phenomenon, i.e. that the Curie temperature (T_C) shifted towards high temperatures from 128 °C at x = 0.01 to 131 °C at x = 0.03. The increase in tetragonality (c/a) of the crystal structure of BHTH is the main reason of the increase in T_C.