气氛对YBiO_3成相过程的影响

Effects of Preparation Atmosphere on Phase Formation of YBiO_3

在不同热处理气氛下,分别对用草酸盐共沉淀法制备的YBiO3粉末及在单晶YSZ(100)衬底上采用化学溶液沉积技术(CSD)沉积的YBiO3膜进行了研究。结果表明:在空气、氩气、氩-氧气混合气体中利用草酸盐共沉淀法均能合成YBiO3相;而在氩-氢混合气氛中,由于Bi3+将被还原成单质铋,采用草酸盐共沉淀法无法合成YBiO3单相粉末。同时YBiO3相在氩-氢混合气氛中也不稳定。在YSZ(100)单晶衬底上,空气气氛中可以成功制备c轴取向的YBiO3膜,而氩-氢混合气氛条件下无法获得YBiO3膜。这一结果限制了YBiO3作为缓冲层通过RABiTS路线来制备高温超导涂层导体。

Fabrication of YBiO3 powder by an oxalate co-precipitation method and deposition of YBiO3 film on YSZ（100） single crystal by CSD process were studied. The results showed that the YBiO3 powder could be fabricated by the oxalate co-precipitation method in air, Ar, and Ar-O2 atmospheres, but it was impossible to obtain the YBiO3 powder in Ar-H2 atmosphere due to loss of Bi. It was also proved that the YBiO3 phase was not stable after it was heated Ar-H2 atmosphere. The results also indicated that a YBiO3 film could be deposited successfully on a YSZ（100） single crystal air however, it was impossible to deposit a YBiO3 film on a YSZ（100） single crystal if the atmosphere was Ar-H2 mixed gas. It implies that YBiO3 is not a good candidate for coated conductors fabricated by RABiTS routes.