THE STRUCTURE AND PROPERTIES OF SOME DOUBLE AND TRIPLE PHOSPHATES WITH THE STRUCTURE OF VITLOKIT

The purpose of the work: establishing the crystallochemical laws of structure of the double and triple phosphates with the different combination of the two-valent and a single-valent or the two-valent and three-valent elements; comparing the different methods of analysis of the substance structure. The structure of the double and triple phosphates with a single-, two- and three-valent elements has been studied, using the different methods such as roentgenography, magnetochemistry, the Messbauer and IR-spectroscopy. The crystalline structure of 10 compounds have been determined. Using the methods of the roentgenostructural analysis and Messbauer spectroscopy, the peculiarities of structure of Ca*001*000M(PO*004)*007 and Ca*009MgM(PO*004)*007 (M=Li, Na, K) have been established. The mobility of the Lithium and Natrium in the structure positions has been revealed. It has been shown, that in the double phosphate of Calcium and Iron, the reversible redox reactions take place without destruction of the crystalline grid. It has been proved, that these reactions are connected with input or output of ion H*99+ in the crystalline grid. The detected peculiarities of structure of the double and triple phosphates with alkali cations make the study of the segnetoelectric and optic properties of these compounds with the view of receiving the materials with practically important properties being perspective. The double phosphate of Calcium and Iron has been recommended as the material, intended of cleaning the gaseous mixtures from the little quantities of hydrogenAvailable from VNTIC / VNTIC - Scientific & Technical Information Centre of RussiaSIGLERURussian Federatio