Gd^(3+)、Mo^(6+)共掺杂BiVO_(4)颜料的制备及表征

Synthesis and characterization of Gd^(3+)and Mo^(6+)co-doped BiVO_(4)pigments

在炎热地区,将色彩艳丽的环境友好型高近红外反射颜料作为建筑外墙以及交通工具的外漆,可减少制冷所需要的空调能耗,可在满足人们视觉需求的同时,有效缓解城市“热岛效应”.离子掺杂是调和颜料的色彩的重要手段.研究采用固相煅烧法制备了钆离子和钼离子共掺杂的(Gd_(0.5)Mo)_(x)(BiV)_(1-x)O_(4)(x=0,0.1,0.2,0.3,0.4,0.5)近红外反射黄色颜料.通过X射线衍射仪(XRD)、紫外/可见/近红外分光光度计、色度仪和热重–示差扫描量热仪(TG–DSC)、扫描电子显微镜(SEM)等对颜料样品的结构组成、反射特性、颜色及热稳定性等进行了测试表征.结果表明,制备的颜料样品为单斜白钨矿结构,Gd^(3+)和Mo^(6+)通过取代Bi^(3+)和V^(5+),成功进入BiVO4晶格.随着掺杂量的增加,样品颜色由暗黄向明黄转变,在700~2500 nm波段近红外反太阳光射率最高达到82.5%.所制备的颜料具有良好的热稳定性.因而,黄色(Gd_(0.5)Mo)_(x)(BiV)_(1-x)O_(4)可作为热反射隔热候选颜料用于建筑及交通工具等领域.

In hot areas,the use of colorful environment-friendly near-infrared(NIR)reflective pigments as the exterior paint of buildings and vehicles can reduce the energy consumption of air-conditioning required for refrigeration.It can not only meet the visual needs of people,but also effectively alleviate the urban island effect.Ion doping is an important means of blending pigments.A series of(Gd_(0.5)Mo)_(x)(BiV)_(1-x)O_(4)(x=0,0.1,0.2,0.3,0.4,0.5)pigments was synthesized via co-doping with Gd^(3+)and Mo^(6+)by solid-state calcination.The phase structure,color performance and morphology of developed powders were investigated by colorimetric spectrophotometer,X-ray diffraction(XRD),scanning electron microscopy(SEM),ultraviolet-visible-near infrared diffuse reflectance spectroscopy.The results showed that the synthesized pigment samples had a monoclinic scheelite structure with good crystallinity,and Gd^(3+)and Mo^(6+)were substitute for Bi^(3+)and V^(5+)successfully.With the increase of the doping amount,the color changes from dark yellow to bright yellow.Moreover,the synthesized pigments exhibited high NIR solar reflectance at a maximum of 82.5%in the range of 700–2500 nm.The synthesized pigment samples had good thermal stability.The yellow(Gd_(0.5)Mo)_(x)(BiV)_(1-x)O_(4)pigments can be used as a candidate material for heat-reflecting and heat-insulating.