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Nb5+掺杂 BaZr0.1Ti0.89Fe0.01O3陶瓷的晶体结构及介温特性
作者:闫树浩 郑占申 李远亮 汪宇凡 顿温新 
单位:华北理工大学材料科学与工程学院 河北省无机非金属重点实验室 唐山市环境功能材料重点实验室 河北 唐山 063210 
关键词:五氧化二铌 弥散相变 介温特性 
分类号:TQ174
出版年,卷(期):页码:2017,45(12):1763-1769
DOI:10.14062/j.issn.0454-5648
摘要:

采用传统固相法制备 BaZr0.1Ti0.89Fe0.01O3–yNb2O5 (BZTF–yNb)陶瓷,研究了 Nb2O5作为改性剂对 BZTF 陶瓷晶体结构、微观形貌及弥散相变的影响。结果表明:所有试样均形成单一的钙钛矿晶相结构,Nb2O5对晶体结构有一定的调整作用。当掺入量为 0.75% (摩尔分数)时,试样常温下为四方相结构。当 0.00≤y≤0.75%时,试样的介电常数随掺杂量 y 的增加而逐渐增大,介电损耗则呈现急剧减小趋势。Nb2O5可使四方相更加稳定,Curie 温度移向高温方向。同时,铁电相向顺电相转变的相变峰变得宽化和弥散,提高试样的介温稳定性。烧结温度为 1 300 ℃、Nb2O5 含量为 0.75%时陶瓷试样有最佳的介电性能:介电常数 ε=6 039,介电损耗 tanδ=0.007,Curie 温度 TC 与弥散系数 γ 分别为 16 ℃和 1.98。

BaZr0.1Ti0.89Fe0.01O3–yNb2O5 (BZTF–yNb) ceramics were synthesized via a conventional solid state reaction route. The effect of Nb2O5 addition on the crystal structure, microstructure and diffuse phase transition of BZTF ceramics were investigated by X-ray diffraction, scanning electron microscopy and capacitance measurement. The results show that all the samples have a single perovskite structure, and the crystal structure of Nb-doped BZTF is slightly adjusted. The tetragonal structure of 0.75% (in mole fraction) Nb-doped samples was determined at room temperature. The dielectric constant increases and the dielectric loss decreases with the increase of Nb2O5 content from 0.00% to 0.75%. Nb2O5 can stabilize the tetragonal structure, increase the Curie temperature and make the phase transition from ferroelectric phase to paraelectric phase, indicating the stable temperature-dependent dielectric properties. It is indicated that 0.75% Nb-doped sample sintered at 1 300 ℃ has the optimal dielectric properties (ε=6 039, tanδ=0.006, TC=16℃ and γ=1.98)

基金项目:
作者简介:
闫树浩(1991—),男,硕士研究生。
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