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Effects of dysprosium oxide doping on Microstructure and Properties of Barium Titanate Ceramic

Journal of Rare Earths 2005年第4期23卷 442-445页

作者：蒲永平任慧君陈维陈寿田 State Key LaboratoryofElectrical Insulationfor Power Equipment Xi'an Jiaotong University Xi'an 710049 China Shaanxi University ofScience and Technology Xianyang 712081 China

Different amounts of dysprosium oxide were incorporated into barium titanate powders synthesized by hydrothermal method. Relations of substitution behaviors and lattice parameters with solid-solubility were studied. Furthermore, the influences of dysprosium oxide doping fraction on grain size and dielectric properties of barium titanate ceramic, including dielectric constant and breakdown electric field strength , were investigated via scanning electron microscope, X-ray diffraction and electric property tester. The results show that dysprosium oxide can restrain abnormal grain growth during sintering and that fine-grained and high density of barium titanate ceramic can result in excellent dielectric properties. As mass fraction of dysprosium oxide is 0.6%, the lattice parameters of grain increase to the maximum because of the lowest vacancy concentration. The electric property parameters are cited as following： dielectric constant （25 ℃ ） reaches 4100, the change in relative dielectric constant with temperature is - 10% to 10% within the range of - 15 - 100 ℃, breakdown electric field strength （alternating current） achieves 3.2 kV·mm^-1, which can be used in manufacturing high voltage ceramic capacitors

关键词： inorganic nonmetallic material dysprosium oxide doping microstructure and properties barium titanate ceramic rare earths

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Dielectric Properties at High Frequency of BSTO System Doped Dy_2O_3

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Journal of Rare Earths 2003年第S1期21卷 146-149页

作者：张鹤凌梁辉徐廷献 Key Laboratory of Advanced Ceramics and Machining Technology Ministry of EducationTianjin University

Samples doped with different amount of dysprosium oxide into barium strontium titanate (BSTO) were prepared. Dielectric properties of the samples at high frequency were discussed. X-ray diffraction (XRD) method was employed for analyzing and comparing with the changes in the crystal lattice of the samples,and information of crystal growth was obtained through method of environmental scanning electron micrograph (ESEM). Influence of dysprosium oxide doping on dielectric properties of BSTO based ceramic system at high frequency was studied. Phenomenological coefficients of the samples were calculated on the base of tunability.

关键词： BSTO dielectrics constant dysprosium oxide doping tunability phenomenological coefficient rare earths

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