Characterization of Bi1-XNbXO1.5+δ Powders by Hydrothermal Synthesis

• Main Authors: Xiu-Hui Hsu, 許秀慧
• Other Authors: 王錫福
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/6g5dam

碩士 === 國立臺北科技大學 === 材料科學與工程研究所 === 98 === The aim of this study was to develop bismuth-based solid electrolytes with high ionic conductivity for intermediate temperature (500～800oC) SOFC (solid oxide fuel cell) instead of conventional YSZ electrolytes showing very low ionic conductivity during 500～800oC. In this study, a series of Bi1-XNbxO1.5+δ powders were fabricated hydrothermally by altering the mineralizers, reaction temperature and holding time. The precursor of bismuth nitrate and niobium oxide were fabricated nano size Bi1-XNbXO1.5+δ powders. The specimen were characterized by X-ray diffraction、scanning electron microscopy、 electrical conductivity. The morphology were spherical, can effectively control the powders morphology and mean powder size were 80~100 nm. Analysis of Bi3NbO7 cubic fluorite structure by XRD. Bi0.79Nb0.21O1.5+δ powders into dense pellets at sintered temperature 800oC/2 h, Bi0.79Nb0.21O1.5+δ had the highest conductivity by DC 4-wire resistance measurement. The conductivity was 0.35 Scm-1 at 800oC.