摘要
以V2O5、钨酸铵、钼酸铵和草酸为原料,采用高温热解前躯体的方法制备了复合掺杂W6+和Mo6+的相变纳米VO2粉体。采用TG、DSC、DTG、XRD等手段对热分解产物的结构及热分解动力学进行了研究。结果表明:热分解过程中复合掺杂W6+和Mo6+的VO2纳米晶的生长是受溶质扩散和表面反应共同控制的过程,热分解时间为40 min时,热分解体系的表观活化能为51.56 kJ/mol;随着热分解温度的升高和热分解时间的延长,复合掺杂W6+和Mo6+的纳米VO2粉体晶粒尺寸逐渐增大,而晶格畸变度逐渐下降。
By thermal decomposition,the co-doped VO2 powders doped with W6 and Mo6＋ ions were prepared from the precursor using V205, （NH4）6WTO246H20, （NH4）6Mo704H20 and oxalic acid as sources. The structure and thermal decomposition dynamics of the co-doped VOz nanopowders were characterized by TG/DSC/DTG and XRD. The results indicated that the growth mechanism of the co-doped VOz nanocrystals were controlled by both of the solute diffusion and the surface reaction in the thermal decomposition process and the superficial activation energy of the co-doped VO2 nanopowders were 51.56 kJ/mol when the thermal decomposition time is 40 min. The grain size of the co-doped VO2 nanopowders increased and the lattice distortion degree decreased with the increase of the thermal decomposition temperature and the prolong of the thermal decomposition time.
出处
《新型建筑材料》
2014年第1期22-26,共5页
New Building Materials
关键词
复合掺杂VO2粉体
热分解动力学
活化能
生长模型
W6＋ and Mo6＋ co-doped VO2 nanopowders
thermal decomposition dynamics
activation energy：growth model
