摘要
以硝酸铈和氧化钆为前驱物 ,采用凝胶浇注工艺合成了钆掺杂氧化铈 (Ce0 .8Gd0 .2 O1 .9,简称 GDC)粉体。然后用流延工艺制备了 GDC固体电解质薄膜。采用 DTA-TG、XRD、TEM等方法研究了粉体的相形成、粒度等与合成工艺的关系。通过密度测定及显微组织观察等技术研究了流延生坯的烧结性能。借助交流阻抗谱仪对所制备的 GDC电解质膜的电导率进行了测量。结果表明 ,采用本实验的凝胶浇注方法 ,在 70 0℃温度下煅烧干凝胶 ,即可制备出纯度高、组成均匀、相结构完整、纳米粒度的 GDC粉体。而且所得粉体具有较高的烧结活性 ,其流延生坯经 1 45 0℃烧结后的相对密度可达 95 %以上。所得 GDC电解质膜在 70 0℃空气中的氧离子电导率可达 4.6S/ m。
Gadolinium doped ceria Ce_ 0.8Gd_ 0.2O_ 1.9(GDC) powders were synthesized by a gel-casting method. The phase composition, morphology, and particle size of the powders were characterized. The GDC powder obtained was of a single fluorite phase with particle size from 30 to 100 nm after calcining the dried gel at 500~900 ℃. The green GDC tapes with thickness of 50~200 μm were obtained by tape casting. The cast GDC tapes have a density more than 95% of theoretical after sintering at 1 450 ℃. An ionic conductivity of about 4.6 S/m was measured for the sintered tapes calcined at 700 ℃ in air.
出处
《应用化学》
CAS
CSCD
北大核心
2002年第11期1084-1087,共4页
Chinese Journal of Applied Chemistry
基金
国家自然科学基金 (2 0 0 710 2 9)
国家"973"(G-2 0 0 0 0 2 64 0 9)资助项目
