Al掺杂Fe_(2)(MoO_(4))_(3)的热致变色性能研究

Thermochromic Properties of Al-doped Fe_(2)(MoO_(4))_(3)

通过溶胶凝胶法制备了单斜Fe_(2)(MoO_(4))_(3)到单斜Al_(2)(MoO_(4))_(3)固溶体系列的Fe_(2-x)Al_(x)(MoO_(4))_(3)(x=0,0.2,0.4,0.6,0.8,1.0,1.2,1.4,1.6,1.8,2.0)粉末样品。通过X射线衍射发现所有样品都具有相同的单斜相结构,没有发生相分离,成功做到不同比例下的Fe_(2-x)Al_(x)(MoO_(4))_(3)共存。单斜Fe_(2)(MoO_(4))_(3)的晶胞体积随铝含量增加而减小,这与Al^(3+)取代Fe^(3+)的进入有关。在600℃下烧制的x=1.6的组合物表现出最好的可逆热致变色性能。基于电荷转移机理的无机可逆热致变色材料具有随温度连续变色的特性,本研究将对钼酸盐基质中的发色团离子之间相互作用的理论机理进行解释,进一步提升新型热致变色材料的可控调节制备及应用。

Fe_(2-x)Al_(x)(MoO_(4))_(3)(x=0,0.2,0.4,0.6,0.8,1.0,1.2,1.4,1.6,1.8,2.0)powder samples of monoclinic Fe_(2)(MoO_(4))_(3)to monoclinic Al 2(MoO_(4))_(3)solid solution series were prepared by the sol gel method.Through X-ray diffraction,it has been found that all samples had the same monoclinic phase structure,no phase structure separation occurred,the coexistence of Fe_(2-x)Al_(x)(MoO_(4))_(3)in different proportions was successfully achieved.The crystal cell volume of monoclinic Fe_(2)(MoO_(4))_(3)is decreased with increasing aluminum content,which is related to the entry of Al^(3+)instead of Fe 3+.The x=1.6 composition fired at 600℃showed the best reversible thermochromic performance,the inorganic reversible thermochromic materials have the characteristics of continuous discoloration with temperature.In this paper,the theoretical mechanism of the interaction between the chromophore ions in the molybdate matrix will be explained to further improve the controllable regulation preparation and application of new thermochromic materials.