【作者】 汪潇； 黄金亮； 杨留栓； 王秋珂； 顾永军；

【Author】 WANG Xiao~1 HUANG Jin-liang~1 YANG Liu-shuan~1 WANG Qiu-ke~2 GU Yong-jun~1 (1.School of Materials Science and Engineering,Henan University of Science and Technology,Luoyang 471003,China;2.Fifth Corporation,Pingdingshan Coal Company Limited,Pingdingshan 467091,China)

【机构】 河南科技大学材料科学与工程学院； 河南省平顶山煤业集团公司五矿；

【摘要】 以分析纯的 Bi（NO₃）₃·5H₂O,ZnO 和 Nb₂O₅为反应物,KOH 为矿化剂,采用水热法合成立方焦绿石结构的 Bi_1．5ZnNb_1．5O₇纳米粉体．通过 XRD 对合成粉体进行物相分析,并通过 Scherrer 公式计算粉体晶粒的尺寸：TEM 分析所合成粉体的形貌．研究水热反应温度、时间、前躯体的含量、KOH 的浓度以及有无搅拌等水热合成条件的变化对合成粉体的物相的影响,从而初步确定水热合成立方焦绿石结构的 Bi_1．5ZnNb_1．5O₇纳米粉体的温度区间、时间范围、前驱体含量和 KOH 浓度等工艺参数,并讨论了其反应过程。研究结果表明,在 Nb：Bi=2．0、KOH 浓度为1．8mol/L、反应温度为220℃、反应时间为24h、充分搅拌的情况下,水热反应进行得最彻底,可以合成单相的 Bi_1．5ZnNb_1．5O₇纳米粉体．更多还原

【Abstract】 The cubic pyrochlore phase Bi_1.5ZnNb_1.5O₇ nanopowder was successfully synthesized by the Hydrothermal method （HTM）.Bi（NO₃）₃·5H₂O,ZnO and Nb₂O₅ were used as starting materials,and the kind of mineralizer,KOH,was used.The phase and microstructure of the powder were analyzed by the means of XRD and TEM,the crystalline sizes of powder were determined from the Scherrer equation.The effect of synthesis temperature,reaction time,starting materials content,KOH concentration and stir or no it on phase formation was investigated in hydrothermal processing,and the relative parameters were determinded.At the same lime,the hydrothermal reaction process was discussed.The investigations reveal that the single-phase Bi_1.5ZnNb_1.5O₇ nanopowders can be successfully obtained in company with stir by HTM at 220℃ for 24h when KOH concentration is about 1.8mol/L.更多还原