Ca^(2+)和Cu^(2+)掺杂对铬酸锶镧烧结及电性能的影响

Effects of Ca^(2+) and Cu^(2+) Doping on Sintering and Electrical Properties of La_(0.85)Sr_(0.15)CrO_3

La_(0.85)Sr_(0.15)CrO_3是固体氧化物燃料电池普遍使用的连接材料,但其难以烧结致密。该文考察了Ca^(2+)和Cu^(2+)分别在La位和Cr位取代对La_(0.85)Sr_(0.15-x)Ca_xCr_(1-y)Cu_yO_3(x=0～1、y=0.2～0.8)连接材料烧结性能、电性能和热膨胀性能的影响。实验表明,当x=0.05、y=0时,材料La_(0.85)Sr_(0.1)Ca_(0.05)CrO_3的电导率显著提高,800℃时达到20.1 S/cm。研究La位和Cr位共掺杂发现,x=0.05、y=0.05时的试样烧成温度降低了100℃,体积密度提高31.6%,同时材料的热膨胀系数也与8YSZ电解质材料匹配。

La0. 82 Sr0.15 CrO3 is commonly used as the ceramic interconnect material for solid oxide fuel cell （SOFC） applications. However, it is difficult to sinter this type of material to high density. The effects of Ca^2＋ and Cu^2＋ doping substitution on the sintering characteristics, thermal expansion and electrical conductivity properties of La0 82 Sr0. 15-xCaxCr1-y CuyO3 were investigated. It was found that the electrical conductivity of La0.85 Sr0. 15 CrO3 was effectively improved at x=0.05 and y=0, a peak value of 20.1 S/cm was obtained at 800 ℃. The study of La and Cr co-doping found that the sintering temperature of the sample was reduced by 100 ℃ at x= 0.05 and y=0.05, while the bulk density was increased by 31.6%. Meanwhile, the thermal expansion coefficient of samples was compared with that of 8YSZ electrolyte.