水热法制备(NH_4)_xWO_(3-y)和WO_3·1/3H_2O:反应温度对产物物相、微结构和光学性能的影响（英文）  

Effects of Reaction Temperature on Structure and Optical Properties of Hydrothermally Prepared(NH_4)_xWO_(3-y) and WO_3·1/3H_2O

作　　者：王琨[1] 康利涛[1] 陈石[2] 董丽[1] 梁伟[1] 高峰[1,3] 

机构地区：[1]太原理工大学材料科学与工程学院,无机纳米能源实验室,太原030024 [2]中国科学院上海硅酸盐研究所,上海200050 [3]中国科学院煤炭化学研究所,煤转化国家重点实验室,太原030024

出　　处：《无机材料学报》2014年第5期550-556,共7页Journal of Inorganic Materials

基　　金：Postdoctoral Science Foundation of China(2012M520605);Research Foundation of Taiyuan University of Technology(tyut-rc201369a,2013Z040);Open Foundation of State Key Laboratory of Coal Conversion(09-102);Natural Science Foundation of Shanxi Province(2013011042-1)

摘　　要：本工作研究了水热法制备钨系氧化物过程中反应温度对产物物相、微结构和光学性能的影响。XRD结果表明100℃条件下制备的样品为纳米六方相铵钨青铜(NH4)xWO3-y。随着水热温度升高(140和180℃),部分六方相(NH4)xWO3-y逐步转变为正交相三氧化钨WO3·1/3H2O,形成两相共存产物。SEM和TEM分析证实(NH4)xWO3-y和WO3·1/3H2O粒子均为沿[001]方向(c轴)生长的短棒状单晶,随水热反应进行它们会通过取向融并(oriented attachment)方式进一步长大。结构分析同时证实,棒状晶的物相与其尺寸存在明显联系,纳米尺寸的棒状晶为六方(NH4)xWO3-y相,而微米尺寸的棒状晶为正交WO3·1/3H2O相。依据实验结果,提出了一种表面能控制的六方相(NH4)xWO3-y向正交相WO3·1/3H2O相转变机理。光学性能测量表明,100℃制备的六方相(NH4)xWO3-y样品可以很好的遮蔽近红外光(遮蔽率:74.5%),同时保持高可见光透过率(67.6%)。Effects of reaction temperature on phase, microstructure and optical property of hydrothermally prepared （NH4）xWO3-y and WO3·1/3H2O were studied in this work. XRD results show that the sample prepared at 100℃ is hexagonal （NH4）xWO3-y （h-（NH4）xWO3-y）. At higher reaction temperatures of 140℃ and 180℃, the hexagonal （NH4）xWO3-y gradually and partially transforms into orthorhombic WO3·1/3H2O（o-WO3·1/3H2O）. SEM and TEM images illustrate that both （NH4）xWO3-y and WO3·1/3H2O crystallites show a short-rod shape with a [001] growth direction （c axis）. The phases of crystallites seem to be strongly related to crystallite sizes; nano- and micro-sized crystallites adopt h-（NH4）xWO3-y and o-WO3·1/3H2O, respectively. Based on XRD, SEM and TEM results, a mechanism is extracted to explain the transformation from h-（NH4）xWO3-y to o- WO3·1/3H2O. Optical measurements indicate that the h-（NH4）xWO3-y nano-rods prepared at 100℃ exhibit a low infrared light transmittance of 25.5%, and maintaining a high luminous transmittance （67.6%）, mainly due to the rice crystallite sizes.

关 键 词：(NH4)xWO3-y WO3-x·1 3H2O 反应温度 近红外光遮蔽性能 

分 类 号：TB321[一般工业技术—材料科学与工程]