中文摘要：

Ca3Co2O6是一种常用的热电材料,但是其透氧性能则少有人关注。以Ca（NO3）2·4H2O和Co（NO3）2·6H2O为原料,采用柠檬酸络合法制备了纯相Ca3Co2O6材料,系统分析了煅烧温度和保温时间对合成Ca3Co2O6的影响。样品烧结致密化后,通过四端引线法和气相色谱装置分别考察了它的电导率和透氧率。实验结果表明,热处理温度为900℃,保温2 h可以获得纯相的Ca3Co2O6粉体,粉体的形貌为蠕虫状。提高热处理温度和延长保温时间,样品的结晶度随之提高,晶粒尺寸也随之长大。样品经烧结后获得致密膜片,950℃时电导率可达11.95 S·m~（-1）。Ca3Co2O6具有一定氧渗透能力,950℃时透氧率为7.36×10~（-8） mol·cm~（-2）·s~（-1）,有望作为一种新型的混合导体用于纯氧的制备。

英文摘要：

Ca3Co2O6 is a well-known thermoelectric material, while its oxygen permeability was rare reported. In this study, the pure phase Ca3Co2O6 was prepared via citrate complex method using Ca（NO3）2·4H2O and Co（NO3）2·6H2O as raw materials. The effects of heat treatment temperature and holding time on the synthesis of Ca3Co2O6 were investigated. After sintering, the electronic conductivity and oxygen permeability of Ca3Co2O6 were analyzed by fourterminal DC method and vertical high-temperature gas permeation cell, respectively. The experiment results show that the worm-like Ca3Co2O6 powder can be achieved by calcining at 900 ℃ for 2 h. Increasing the temperature or the holding time, the degree of crystallinity and the grain size of Ca3Co2O6 were increased gradually. The dense membrane was obtained after sintering, which conductivity reached 11.95 S·m~（-1） at 950 ℃. The oxygen permeation flux of the membrane was 7.36×10~（-8） mol·cm~（-2）·s~（-1） at 950 ℃, indicating it may be a promising candidate for oxygen separation.