类八面体BaMoO_4微晶的熔盐法合成  

Molten salt synthesis of octahedron-like BaMoO_4 microcrystals

作　　者：孙星[1] 刘云飞[1] 吕忆农[1] 戴沈华[1] 刘奇[1] 

机构地区：[1]南京工业大学材料科学与工程学院,材料化学工程国家重点实验室,江苏南京210009

出　　处：《南京工业大学学报（自然科学版）》2012年第2期58-62,共5页Journal of Nanjing Tech University(Natural Science Edition)

基　　金：江苏高校优势学科建设工程资助项目

摘　　要：通过熔盐法,以NaNO3为熔盐介质制备纯相BaMoO4微晶。考察合成温度、反应时间及熔盐含量对产物结晶度、粒径及形貌的影响。采用X线衍射仪(XRD)和扫描电子显微镜(SEM)对微晶进行表征。结果表明:在各种反应条件下都能得到纯的四方相白钨矿结构BaMoO4微晶,且结晶性良好。合成温度及反应时间对产物的形貌有明显影响,随着合成温度的升高和反应时间的延长,晶粒尺寸分布缩小,形貌规整且呈类八面体。熔盐含量对BaMoO4微晶尺寸影响显著,随着熔盐含量增多,晶粒的平均尺寸缩小。制备形貌规整且尺寸较小的BaMoO4微晶适宜条件为NaNO3与Na2MoO4的摩尔比=10∶1时在500℃下保温4 h。Pure BaMoO4 microcrystals were synthesized through molten salt method with NaNO3 as reaction media.The effects of the temperature,soaking time and amount of molten salt on the crystallinity,particle size and morphology of product were investigated.Characterization techniques,such as X-ray diffractometer（XRD）,and scanning electron microscope（SEM）,were used to analyze the products.Results showed that BaMoO4 microcrystals with pure tetragonal phase scheelite structure and excellent crystallinity were obtained under several conditions.Temperature and soaking time obviously affected the morphology of products.With prolonging time and elevating temperature,size distribution shrank and particles had a well-defined shape,similar to octahedron.The optimal conditions for BaMoO4 microcrystals with well-defined morphology and high crystallinity from molten salt synthesis were 500 ℃ for 4 h with 10∶1 molar ratio of NaNO3 to Na2MoO4.

关 键 词：BaMoO4微晶 熔盐法合成 白钨矿结构 

分 类 号：TB39[一般工业技术—材料科学与工程]