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solid-solid synthesis
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The impurity-doped precursors containing (NH4 )5 [(VO)6 (CO3)4(OH)9]·10H2O considerably stable in air were synthesized while VOCl2 solution containing Cr(3+), TiO(2+), MoO(3+) alld WO, respectively, was dropped into saturation NH4HCO3 solution containing solid NH4HCO3. The precursors were thermolysized to obtain title compounds at ≤400℃ in nitrogen, and then the compounds were sintered in argon at 1050℃for half an hour to prepare ceramics samples. The resuts show that the variation ratios of resistance for Cr-doped...

The impurity-doped precursors containing (NH4 )5 [(VO)6 (CO3)4(OH)9]·10H2O considerably stable in air were synthesized while VOCl2 solution containing Cr(3+), TiO(2+), MoO(3+) alld WO, respectively, was dropped into saturation NH4HCO3 solution containing solid NH4HCO3. The precursors were thermolysized to obtain title compounds at ≤400℃ in nitrogen, and then the compounds were sintered in argon at 1050℃for half an hour to prepare ceramics samples. The resuts show that the variation ratios of resistance for Cr-doped samples arc about 103 order of magnitude at phase transition temperatures. This wet method has adventages of saving energy, handiness and good efficiency in comparison with conventional methods of solid-solid synthesis.

利用VO(2+)与NH4HCO3反应生成对氧颇稳定的氧钒(Ⅳ)碱式碳酸铵晶体的特性,分别掺入Cr(3+)、TiO(2+)、MoO(3+)、WO杂质离子合成VO2掺杂母体;母体在N2气氛下、≤400℃时,热分解制得活性大的标题化合物,再经压片、1050℃高温烧结0.5h得到陶瓷.合成试样相变时,电阻率改变约3个数量级,与传统固-固合成法的相同,但温化学法与固-固合成法比较具有节能、简便、设备要求较低、成本低的优点.

 
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