摘要
水热合成了钒磷酸盐体系中少有的结构中具有多面体共棱连接的层状孔道结构化合物(pipzH2)2[(VO)3(HPO4)2(PO4)2].H2O的纯相。用ICP、单晶XRD、TG-DTA、粉晶XRD和SEM对产物进行了表征。结果表明,化合物在空气中开始失重的温度为274℃,随着温度的升高,化合物中有机分子分解,同时伴随着重结晶过程,但晶体的外观形貌保持不变直至有机部分分解殆尽。相变过程分析和与模板相同的(pipzH2)0.5[(VO)(PO4)]的热稳定性对比研究表明,有机模板的稳定性及分解过程不但影响化合物的热稳定性和热变化过程,还影响原晶体微形貌的保持;无机骨架结合的牢固程度在很大程度上影响化合物的热稳定性。
The thermal behavior of the layered structure vanadium phosphate （pipzH2）2[（VO）3（HPO4）2（PO4）2]·H2O, which was prepared hydrothermally with a mole ratio of the starting material different from that reported, was characterized by ICP, XRD, TG-DTA and SEM. Results show that the tarting decomposition temperature of the organic template in the compound is 274℃ in air. With ncreasing of temperature, the organic template in the compound starts to be decomposed and new phases are formed, but its micro-morphology can be kept until organic template has been decomposed completely. The thermal behavior of the title compound and its comparison to that of a homo-template compound （ pipzH2 ） 0.5 [ （VO） （ PO4 ） ] indicate that the stability, the process of phase transition and the micro-morphology of the compound are influenced both by its decomposing process of the organic template and the stability of its inorganic framework.
出处
《人工晶体学报》
EI
CAS
CSCD
北大核心
2008年第6期1316-1320,1354,共6页
Journal of Synthetic Crystals
基金
国家自然科学基金资助项目(No.40272024)
关键词
层状孔道结构
钒磷酸盐
水热合成
热稳定性
layered structure
vanadium phosphate
hydrothermal synthesis
thermal stability
