Rare earth element-doped bismuth oxides with the fluorite structure (δ-Bi₂O₃) exhibit high oxygen ion conductivity at low temperature, which is promising electrolyte materials for intermediate-temperature solid oxide fuel cells (IT-SOFCs). However, traditional co-sintering process is not applicable to the manufacturing of IT-SOFCs using low melting point Bi₂O₃-based electrolyte, while further high-temperature processing is not required for deposition Bi₂O₃-based electrolytes. In this study, plasma spraying was used to examine the possibility to deposit high-performance Bi₂O₃-based electrolytes without the following high-temperature process. (Bi₂O₃)_0.75 (Y₂O₃)_0.25 (YSB) spray powders were prepared by the sinter-crushing method. The YSB electrolytes were fabricated by plasma spraying at different deposition temperatures. The effects of deposition temperature on the coating microstructure, crystalline stability, and ion conductivity were investigated. Results showed that the as-sprayed YSB electrolytes present a dense microstructure with well-bonded lamellar interfaces. The pure δ-phase YSB electrolyte was deposited with 37.5-75 μm powders at a deposition temperature of 350 °C. The deposited YSB electrolyte presented the excellent ionic conductivity of 0.19 S cm⁻¹ at 700 °C in comparison with 0.21 S cm⁻¹ for sintered bulk.

具有萤石结构的稀土元素掺杂氧化铋（δ-Bi ₂ O ₃ ）在低温下表现出高氧离子电导率，是一种有前途的中温固体氧化物燃料电池（IT-SOFC）电解质材料。然而，传统的共烧结工艺不适用于使用低熔点Bi ₂ O ₃基电解质制造IT-SOFC，而沉积Bi ₂ O ₃基电解质不需要进一步的高温处理。在本研究中，使用等离子喷涂来检验沉积高性能Bi ₂ O ₃基电解质而无需后续高温工艺的可能性。采用烧结粉碎法制备(Bi ₂ O ₃ ) _0.75 (Y ₂ O ₃ ) _0.25 (YSB)喷雾粉末。 YSB电解质是在不同沉积温度下通过等离子喷涂制备的。研究了沉积温度对涂层微观结构、晶体稳定性和离子电导率的影响。结果表明，喷涂的 YSB 电解质呈现出致密的微观结构，层状界面结合良好。纯 δ 相 YSB 电解质采用 37.5-75 μm 粉末在 350 °C 的沉积温度下沉积。沉积的YSB电解质在700℃下表现出优异的离子电导率，为0.19 S cm ^-1 ，而烧结块体的离子电导率为0.21 S cm ^-1 。