摘要
采用叠层法制备了(Bax Sr1-x)TiO3/Mg2TiO4组分梯度陶瓷。采用XRD、SEM、EDS及介电性能测试等手段分析了材料的微观结构和介电性能。结果表明:1375℃烧结3 h的样品较致密、结晶良好,由钙钛矿和尖晶石两相复合而成,且材料内存在Ba/Sr比组分梯度;与不含梯度的复合陶瓷相比,梯度陶瓷不但保持了较大的介电可调度,而且具有较好的介电性能温度稳定性;在室温(20℃)和2 kV/mm电场下,典型样品的介电可调度可达21.9%,当温度升高到60℃时,其可调度仍然保持在较大的值(9.3%)。温度稳定性的改善可归因于不同组分的(Bax Sr1-x)TiO3具有不同的铁电-顺电相转变温度,组分梯度的设计有利于该类材料应用温度范围的拓宽。
（BaxSr1-x）TiO3/Mg2TiO4 composite ceramics with a constituent graded structure were prepared by a solid-state reaction method. Their microstructure and dielectric properties were analyzed by X-Ray diffraction （XRD）, Scanning Electron Microscope （SEM）, Energy Dispersive Spectroscope （EDS） and dielectric property measurements. The results show that the samples sintered at 1375℃ for 3 h are a composite phase of perovskite and spinel structure with a Ba/Sr ratio composition gradient. Compared with the composite samples with a fixed Ba/Sr ratio, the graded samples possess higher tunability and better temperature stability of dielectric properties. At room temperature （20℃）, the tunability of a typical sample is 21.9% under an external DC field of 2 kV/mm, and it maintains a high value of 9.3% at high temperature of 60℃. The improvement of temperature stability is due to the difference in Curie temperature for different layers in gradient （Ba,Sr）TiO3. Meanwhile, the introduction of the composition gradient in this material helps us to obtain a wide temperature application range for the related device.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
2014年第1期52-56,共5页
Journal of Inorganic Materials
基金
安徽省教育厅自然科学基金(KJ2012B129)
阜阳师范学院自然科学基金(2011FSKJ12)
国家自然科学基金(51271059)~~
