摘要
以四水合七钼酸铵和浓硝酸为原料,过量的五氧化二铌为添加剂,并采用XRD和FESEM等技术对水热反应进程中产物组成和微观形貌展开研究。结果表明,水热反应温度150℃反应12 h,当未添加五氧化二铌时,产物为六方h-MoO_(3),并且表面光滑,颗粒尺寸约为0.38μm;添加过量五氧化二铌时,产物组成和形态结构会发生变化:当Nb/Mo摩尔比为0.5∶1时,产物主要为六方h-MoO_(3),伴随残留五氧化二铌;继续增大Nb/Mo摩尔比时,h-MoO 3相对含量减小,h-MoO_(3)纵向表面依旧光滑,但横向表面由许多细小柱状晶粒聚集而成。随着Nb/Mo摩尔比的增加,h-MoO_(3)颗粒尺寸在一定程度上能够得到细化。
The composition and morphological structure of hexagonal molybdenum trioxide synthesize by hydrothermal method was investigated,in which the ammonium hepta-molybdate tetrahydrate and concentrated nitric acid were used as raw materials,and niobium pentoxide was used as an additive.XRD and FESEM techniques were used to analyze the as-synthesized product.At the fixed conditions of 150℃ and 12 h,the results showed that hexagonal h-MoO_(3) could be produced without the addition of niobium pentoxide,and the surface structure of the as-synthesized product was smooth with a particle size of about 0.38μm;when adding excess niobium pentoxide,however,the composition and morphological structure of the as-synthesized product would be affected.When the Nb/Mo molar ratio was 0.5∶1,the product was mainly hexagonal h-MoO_(3) with some residual niobium pentoxide;when the Nb/Mo molar ratio increased,the relative content of h-MoO_(3) decreased and the values of niobium pentoxide increased.The work also found that the longitudinal surface of h-MoO_(3) remains smooth and the transverse surface was relative rough,which is assembled by many fine columnar grains.The particle size of the h-MoO 3 has a decrease trend with the increase of the Nb/Mo molar ratio.
作者
刘子琪
李红肖
王璐
LIU Ziqi;LI Hongxiao;WANG Lu(Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China)
出处
《中国钼业》
2023年第3期45-48,共4页
China Molybdenum Industry
基金
校级大学生创新创业训练计划项目(22Z008)。
关键词
六方三氧化钼
五氧化二铌
物相组成
形态结构
hexagonal molybdenum trioxide
niobium pentoxide
phase composition
morphological structure
