水热合成条件和稀土掺杂对VO_(2)粉体结构及相变温度的影响研究

Effects of Hydrothermal Synthesis Conditions and Rare Earth Doping on the Structure and Phase Transition Temperature of VO_(2) Powder

采用水热合成法制备了VO_(2)粉体,研究了水热条件和Y、La、Ce等元素掺杂对VO_(2)结构及相变温度的影响。结果表明:水热反应时间和温度对VO_(2)晶粒生长影响显著,190℃保温72 h条件下制备的VO_(2)粉体结晶度较好。稀土离子掺杂对VO_(2)粉体成型和相变温度都有影响,其中Y掺杂能起到明显的细化晶粒作用,同时能使VO_(2)相变温度由未掺杂时的68.3℃降到61.6℃;La和Ce的掺杂效果相近,都会对VO_(2)主体结构产生一定破坏,虽然能起到一定降低相变温度的作用,但相转变效果较差。

VO_(2)powder was prepared by hydrothermal synthesis and the effects of hydrothermal conditions and doping of Y,La,Ce and other elements on the structure and phase transition temperature of VO_(2)were explored.Results show that the time and temperature for hydrothermal synthesis can bring significant impact to the grain growth of VO_(2),and the VO_(2)powder prepared at 190℃with holding time of 72 h shows to have good crystallinity.The doping of rare earth ions can bring impact to the formation and phase transformation temperature of VO_(2)powder,among which Y doping can play an obvious role in the grain refinement,and also make the phase transformation temperature reduced from 68.3℃ to 61.6℃(before and after).The doping of La and Ce can bring the similar effect,causing certain damage to the main structure of VO_(2),which can reduce the phase transformation temperature to some extent,also leads to poor phase transformation.