酸蒸气水热前驱物热分解法制备立方ZrW_2O_8类型化合物  

Synthesis of Cubic ZrW_2O_8 and Its Isomorphs by Acidic Steam Hydrothermal and Precursor Decomposing Method

作　　者：邓学彬[1] 赵新华[1] 韩京萨[1] 

机构地区：[1]北京师范大学化学系,北京100875

出　　处：《无机化学学报》2005年第9期1357-1362,共6页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金资助项目(No.20471010);北京市无机化学重点学科资助项目

摘　　要：ZrW2O7(OH,Cl)2·2H2O and its isomorphs were prepared by Acidic Steam Hydrothermal (ASH) method and the pure cubic ZrW2O8 was synthesized by dehydration of ZrW2O7(OH,Cl)2·2H2O. The control factors of ASH method, such as the type, concentration and volume of the acidic steam source, temperature and time of the reac- tion, were studied in detail. The results showed that HCl was a better volatile acidic steam source and the con- centration of HCl determined the product. At lower concentration of HCl, the main product was Na2W2O7·H2O rather than ZrW2O7(OH,Cl)2·2H2O. When the concentration was higher than 6 mol·L-1, the products in turn be- came sodium tungstates with the structure types of pyrochlore, hexagonal tungsten bronze and finally were trans- formed to ZrW2O7(OH,Cl)·22H2O precursors.ZrW2O7（OH,Cl）2·2H2O and its isomorphs were prepared by Acidic Steam Hydrothermal （ASH） method and the pure cubic ZrW2O8 was synthesized by dehydration of ZrW2O7（OH,Cl）2·2H2O. The control factors of ASH method, such as the type, concentration and volume of the acidic steam source, temperature and time of the reaction, were studied in detail. The results showed that HCl was a better volatile acidic steam source and the concentration of HCl determined the product. At lower concentration of HCl, the main product was Na2W2O7·H2O rather than ZrW2O7（OH,Cl）2·2H2O. When the concentration was higher than 6 mol·L^-1, the products in turn became sodium tungstates with the structure types of pyrochlore, hexagonal tungsten bronze and finally were transformed to ZrW2O7（OH,C1）2·2H2O precursors.

关 键 词：酸蒸气水热合成 热收缩化合物 ZrW2O7(OH Cl)2·2H2O ZRW2O8 

分 类 号：O611.4[理学—无机化学]