硅酸盐学报

Cr缺位对Pr0.7Ca0.3CrO3?δ基连接材料性能的影响

作者：卢肖永杨权杨雪杨远陈永红丁岩芝

单位：(低温共烧材料安徽省重点实验室淮南燃料电池材料工程技术研究中心淮南师范学院安徽淮南 232001)

分类号：O614.33

出版年,卷(期):页码：2019,47(7):0-0

DOI：

摘要：

采用柠檬酸燃烧法合成一系列Pr0.7Ca0.3Cr1?xO3?δ连接材料，利用X射线衍射和扫描电子显微镜对材料的物相和微观形貌进行表征，四端子探针法测量样品的电导率，热膨胀仪测定热膨胀系数。结果表明：Cr缺位对材料Pr0.7Ca0.3CrO3-δ物相结构没有影响；Cr缺位提高材料的烧结性能。x=0.07的样品，1 400 ℃烧结5 h，相对密度达 98%；700 ℃时，样品在空气和氢气气氛的电导率分别为34和17 S/cm；样品的热膨胀系数为9.6×10–6/K，与YSZ (8mol%Y2O3-ZrO2)电解质的热膨胀系数接近。意味着Cr缺位Pr0.7Ca0.3Cr1?xO3-δ材料体系是固体氧化物燃料电池有潜力的陶瓷连接材料。

A powder of Pr0.7Ca0.3Cr1-xO3-δ as an interconnect material was synthesized by a citric acid-nitrate self-propagating combustion method, and the phase and micro-morphology of materials were characterized by X-ray diffraction and scanning electron microscope. The conductivity of samples was measured by a direct current four-terminal method, and the thermal expansion coefficient was measured by a thermal dilatometer. The results indicate that Cr deficiency has no influence on the phase of Pr0.7Ca0.3CrO3-δ material and improves the sintering performance of the material. The relative density of the sample with x=0.07 sintered at 1 400 ℃ for 5 h is 98%. At 700 ℃, the conductivity of sample in air and hydrogen is 34 S/cm and 17 S/cm, respectively. The thermal expansion coefficient of the sample is 9.6×10–6/K, which is close to that of YSZ. It is indicated that Cr vacancy Pr0.7Ca0.3Cr1-xO3-δ material could be used as a potential candidate of ceramic interconnect material for solid oxide fuel cell.

基金项目：

国家自然科学基金项目(51202080)；淮南师范学院自然科学重点研究项目(2018xj14zd)

作者简介：

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