Park K, Choi J W, Hwang H K, Saradha T
Faculty of Nanotechnology and Advanced Materials Engineering, Sejong University, Seoul 143-747, Korea.
J Nanosci Nanotechnol. 2010 Nov;10(11):7703-6. doi: 10.1166/jnn.2010.2790.
We successfully synthesized nano-sized Ce(0.8)Gd(0.2)O(2-delta) powders by combustion method, using gelatin as fuel. The calcined powders showed high-quality characteristics, i.e., nano-scale size (14-35 nm) and narrow size distribution. The structural, morphological, and electrical characteristics of the sintered Ce(0.8)Gd(0.2)O(2-delta) were studied systematically, depending on sintering temperature. The crystal structure of the Ce(0.8)Gd(0.2)O(2-delta) belonged to the cubic fluorite structure. The gelatin-assisted combustion synthesized Ce(0.8)Gd(0.2)O(2-delta) powders allowed to sinter well at low temperature for dense and ultra-fine Ce(0.8)Gd(0.2)O(2-delta) electrolyte with good electrical conductivity. The sintering temperature of the Ce(0.8)Gd(0.2)O2 powder was approximately 300 degrees C lower than that of conventional solid-state synthesized powder. The nanopowder produced was sintered into pellets with relative densities over 99.1% of the theoretical value even at 1400 degrees C. The Ce(0.8)Gd(0.2)O(2-delta) sintered at 1400 degrees C exhibited a conductivity of 0.101 S/cm at 800 degrees C in air.
我们以明胶为燃料，通过燃烧法成功合成了纳米级Ce(0.8)Gd(0.2)O(2-δ)粉末。煅烧后的粉末呈现出高质量的特性，即纳米级尺寸（14-35纳米）和窄尺寸分布。根据烧结温度，系统地研究了烧结态Ce(0.8)Gd(0.2)O(2-δ)的结构、形态和电学特性。Ce(0.8)Gd(0.2)O(2-δ)的晶体结构属于立方萤石结构。明胶辅助燃烧合成的Ce(0.8)Gd(0.2)O(2-δ)粉末能够在低温下良好烧结，从而获得致密且具有良好导电性的超细Ce(0.8)Gd(0.2)O(2-δ)电解质。Ce(0.8)Gd(0.2)O2粉末的烧结温度比传统固态合成粉末的烧结温度低约300℃。所制备的纳米粉末即使在1400℃下也能烧结成相对密度超过理论值99.1%的小球。在空气中，于1400℃烧结的Ce(0.8)Gd(0.2)O(2-δ)在800℃时的电导率为0.101 S/cm。
