机构地区: 华南理工大学材料科学与工程学院
出 处: 《华南理工大学学报(自然科学版)》 2006年第9期95-98,共4页
摘 要: 为探讨离子掺杂对晶体相变的促进或抑制作用,采用共沉淀法制备了Zr^4+掺杂量分别为0,2%,5%,7%,10%和13%(摩尔分数,余同)的纳米TiO2,研究Zr^4+掺杂对TiO2从纳米锐钛矿型向金红石型转变的影响,透射电子显微镜研究显示所制备的锐钛矿型TiO2的颗粒直径在10~20nm之间,经X射线衍射研究发现,少量的Zr^4+掺杂抑制了锐钛矿晶粒的长大,将锐钛矿开始向金红石转变的相变温度从750℃提高到850℃.锆可与TiO2反应生成化合物ZrTiO2,为避免该化合物的生成,Zr^4+掺杂量不宜超过10%. In order to reveal the promotion or restraint of phase transformation caused by the doping of ions, nanosized TiO2 doped with Zr^4+ was prepared by means of co-precipitation method, respectively with the Zr^4+ mole fractions of 0, 2% , 5% , 7% , 10% and 13%. The influence of Zr^4+ -doping on the phase transformation of TiO2 from nano-sized anatase to rutile was then investigated. TEM results indicate that the prepared TiO2 anatase is 10 to 20 nm in diameter. XRD results show that the Zr^4+ doping restrains the growth of anatase crystallites, improves the start temperature of phase transformation from 750℃ to 850℃. Moreover, in order to avoid the formation of ZrTiO4 from the reaction of Zr and TiO2, the mole fraction of dopeed Zr^4+ should be less than 10%.