含有机模板钒磷酸盐热稳定性比较研究

A Comparative Study of the Thermal Stabilities of Organic-templated Vanadium Phosphates

对水热合成的V-P-O-en体系中七种常见不同结构钒磷酸盐的热稳定性进行了TG-DTA、FT-IR和XRD的比较研究。化合物中有机分子的受热脱除是阶段性的,吸放热效应与化合物中有机分子的含量有关。影响热稳定性的因素有:无机骨架类型、骨架强度以及骨架与有机模板分子作用强度。无机骨架自身强度较低是导致这类化合物热稳定性低的根本原因。

The thermal stabilities of seven kinds of hydrothermaly synthesized organic-templated vanadium phosphates in the V-P-O-en system have been characterized by TG-DTA, FF-IR thermal and XRD. The thermal decomposition of template molecules in structures was a multiple process. The endothermal or exothermal effect was influenced by the amount of the organic molecules in the structures. The results show that factors influencing the thermal stabilities include the framework type, the strength of inorganic framework and the interactive action between the frameworks and the organic template molecules. The relatively low framework strength is the main reason for the low thermal stability of the compounds.