【摘要】 采用改进的直接沉淀氟配位法，在常温常压下制备出了α－磷酸锆（α－ＺｒＰ），ＸＲＤ结果表明它的层间距为０．７６５ｎｍ，结晶度较好，并以热重分析法（ＴＧ）为手段，对α－ＺｒＰ的热分解过程和非等温热分解动力学机理进行了研究。结果显示，在线性升温速率为１０℃／ｍｉｎ时，α－ＺｒＰ在１３１℃开始脱结晶水；脱去结晶水后形成的Ｚｒ（ＨＰＯ４）２在４５３℃进行磷羟基缩合，至７２０℃完全分解为ＺｒＰ２Ｏ７。脱结晶水和分解过程的失重分别为６．２４％和５．６４％，与理论值基本相符。动力学研究确定了Ｚｒ（ＨＰＯ４）２分解反应属于Ａｖｒａｍｉ－Ｅｒｏｆｅｅｖ的成核和核成长为控制步骤的Ａｌ机理，热分解反应表观活化能为１６５．６ｋＪ／ｍｏｌ，频率因子为３．５０×１０７ｓ－１。更多还原

【Abstract】 Crystalline sample of α Zr(HPO 4) 2·H 2O( α ZrP) has been prepared by a modified method involving complexion of zirconium with fluoride ions in a glass vessel, followed by reaction with phosphoric acid at room temperature. The product is highly crystalline with an interlayer spacing of 0.765 nm. The kinetic behavior and process of thermal decomposition of α zirconium phosphate has been studied by thermogravimetry at linearly increasing temperature. It is illustrated that the crystal water is dehydrated and anhydrous zirconium phosphate is formed at below 453℃. Anhydrous zirconium phosphate is decomposed into ZrP 2O 7 completely at 720℃. The weight losses of dehydration and decomposition were 6.24% and 5.64% respectively, which conformed with theoretical values. The decomposition reaction of anhydrous zirconium phosphate is controlled by Avrami Erofeev random nucleation and subsequent growth mechanism(A1). Accordingly, kinetic equation can be deduced as, d α d t =3.50×10 7· e -165.6×10 3/ RT ·(1- α ). These results are in good agreement with experiment results. 〖WT5”HZ]更多还原