Use of sol-gel chemistry for the preparation of cyanogels as ceramic and alloy precursors

被引:72
作者
Heibel, M
Kumar, G
Wyse, C
Bukovec, P
Bocarsly, AB
机构
[1] PRINCETON UNIV,FRICK CHEM LAB,DEPT CHEM,PRINCETON,NJ 08544
[2] UNIV LJUBLJANA,DEPT CHEM,LJUBLJANA 61000,SLOVENIA
关键词
D O I
10.1021/cm960105u
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The reaction of aqueous solutions of K2PdCl4 and K3Co(CN)(6) results in gellike polymeric materials, characterized by bridging cyanides between the central metals of the adducts. These materials tend to be rigid in nature but contain in excess of 95% water by weight. We refer to these novel transition metal based hydrogels as cyanogels. In contrast to classic inorganic hydrogels these materials are not based on an oxide network. Dehydration of the cyanogels results in amorphous xerogels which maintain the initial polymeric structure of the cyanogel. Thermal processing of gels containing palladium and cobalt centers under an inert atmosphere at temperatures between 200 and 500 degrees C, produces a new metastable material. Sintering between 500 and 1000 degrees C produces ferromagnetic alloys, while processing under oxygen in the same temperature region gives the ceramic mixed oxide material PbCoO2, having the delafossite structure.
引用
收藏
页码:1504 / 1511
页数:8
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