High Temperature Resistivity of Sr2Nb2O7 Ferroelectric Ceramics
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摘要: 采用固相合成法制备了Sr2Nb2O7粉体并应用二步法织构烧结工艺制备得到Sr2Nb2O7陶瓷，研究了陶瓷的显微组织、物相组成以及电阻率随温度及时间的变化。结果表明：陶瓷为纯相，组织为板状晶粒，晶粒沿着加压方向取向良好；陶瓷的高温电阻率随温度的升高而下降，在800℃保温125 h时，垂直试样（其面法线方向垂直于加压方向）的电阻未发生退化；在980℃和1 000℃下，垂直试样均发生了电阻退化行为，且分别在保温20，1 h后出现了击穿现象；在1 000℃下，平行试样（其面法线方向平行于加压方向）因晶界数量较多，其电阻率退化时间较长。
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关键词:
- Sr2Nb2O7铁电陶瓷 /
- 类钙钛矿层状结构 /
- 高温电阻率 /
- 晶粒取向
Abstract: Sr2Nb2O7 powder was prepared by solid-state reaction method, and then Sr2Nb2O7 ceramics were prepared by two-step textured sintering process. The microstructure, phase composition and the change of resistivity with temperature and time of the ceramics were studied. The results show that the ceramics had a pure phase. The structure was composed of plate-like grains and the grains were oriented well along the pressing direction. The high temperature resistivity of the ceramics decreased with the increase of temperature. During holding at 800℃ for 125 h, the resistance of the perpendicular samples (normal direction of the sample surface was perpendicular to the pressing direction) did not deteriorate. At 980℃ and 1 000℃, the perpendicular samples showed resistance degradation behavior, and the breakdown occurred after holding for 20 h and 1 h, respectively. At 1 000℃, the parallel sample (normal direction of the sample surface was parallel to the pressing direction) had relatively long degradation time of resistivity because of the relatively large number of grain boundaries. -
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