(湖南大學(xué) 材料科學(xué)與工程學(xué)院， 長沙 410082)
摘 要: 利用檸檬酸做還原劑， 硝酸鹽做氧化劑， 采用低溫燃燒合成工藝制備納米尺寸的Ce0.8Y0.2O1.9電解質(zhì)粉體， 用XRD、 IR、 TEM和SEM研究產(chǎn)物的微觀結(jié)構(gòu)和燒結(jié)性能。 XRD、 TEM和IR光譜研究表明利用低溫燃燒合成工藝直接獲得了單一的納米Ce0.8Y0.2O1.9固溶體， SEM分析表明電解質(zhì)粉體具有很好的燒結(jié)活性。 利用交流阻抗譜在400~800 ℃溫度范圍內(nèi)測量了電解質(zhì)的電化學(xué)性能， 結(jié)果表明, 800 ℃時氧離子電導(dǎo)率為0.058 S/cm， 活化能為0.73 eV。 采用低溫燃燒合成工藝有利于降低電解質(zhì)的燒結(jié)溫度， 改善電解質(zhì)的性能。
關(guān)鍵字: Ce0.8Y0.2O1.9; 低溫燃燒； 固體電解質(zhì)； 氧離子電導(dǎo)率
Ce0.8Y0.2O1.9 solid electrolyte
（ College of Materials Science and Engineering, Hunan University,
Changsha 410082, China）
Abstract: Nanosized Ce0.8Y0.2O1.9 electrolyte powders were prepared by low-temperature combustion technique using citric acid as reductant and nitrates as oxidant. XRD, IR, TEM and SEM were applied to analyze the microstructure and sinterability of the powders. XRD, IR and TEM results show that the single nanosized Ce0.8Y0.2O1.9 powders can be abtained by low-temperature combustion process， and SEM analysis shows that the electrolyte powders have good sinterablity. Impedance measurements were perfomed over the temperature range of 400-800 ℃. The results show that the oxygen ionic conductivity reaches 0.058 S/cm and the activation energy is 0.73 eV at 800 ℃. It can be concluded that the utilization of low-temperature combustion process can lower the sintering temperature of electrolyte and improve the properties of the final solid electrolyte.
Key words: Ce0.8Y0.2O1.9; low-temperature combustion; solid electrolyte; oxygen ionic conductivity
