快速烧结合成Zr_(1-x)M_xW_2O_8(M=Hf,Sn,Y)固溶体的Raman光谱研究

Raman Spectroscopic Study of Zr_(1-x)M_xW_2O_8(M=Hf,Sn,Y) Solid Solutions by Rapid Solid-State Reactions

首次采用快速烧结合成技术制备了Zr1-xMxW2O8(M=Hf,Sn,Y)系列固溶体。制备的合适条件为:温度1523～1553 K,时间30 min～1 h,同传统固相反应烧结相比,该方法合成时间和能耗显著降低。XRD和Raman光谱分析表明,Zr1-xMxW2O8(M=Hf,Sn,Y)固溶体具有α-ZrW2O8的结构和性质,并且通过Zr离子的同价和异价取代,可改变ZrW2O8的晶胞参数、相变温度和提高其烧结性能。固溶体α相向β相转变的相变温度随Hf替代量的增加而升高,而随Sn和Y替代量的增加而降低。

Zr1-xMxW2O8（M= Hf,Sn,Y） solid solutions are successfully synthesized by rapid solid-state reactions for the first time.The appropriate temperature and sintering time are 1523～1553 K and 30～60 min,respectively.Compared with traditional synthesis methods,this new synthetic method simplifies the production process and reduces the sintering time and energy consumption greatly.Powder XRD and Raman spectroscopic analyses reveal that the Zr1-xMxW2O8（M=Hf4＋,Sn4＋,Y3＋） solid solutions are cubic ZrW2O8 type in crystal structure.Substitutions using equivalent and nonequivalent ions alter the properties of ZrW2O8 such as cell parameters,order-disorder phase transformation temperatures and thermal stability.Temperature dependent Raman spectroscopic studies demonstrate that the order-disorder phase transition temperature increases with increasing the content of Hf and decreases with increasing the content of Y and Sn.