X-ray graphical and thermodynamical study of mercury arsenates

Purposes of the work are both determination of lattice parameters on the base of X-ray graphical data and experimental study of thermal conduction dependence of mercury arsenates Hg(AsO3)2 and Hg3(AsO4)2. In this work for the first time the parameters of elementary cell thermal conduction in the range 298.15-625 K were determined. Formation of equilibrium contents of mercury arsenates was confirmed by X-ray phase analysis conducted on DRON-2,0 unit under Cu K - radiation. Curves of thermal-differential analysis show, that Hg(AsO3)2 and Hg3(AsO4)2 melting incongruently, relatively at 725 and 790 grad C. Displaying of X-ray- grammars of examined compounds have been conducted by homology method. On the base the displaying parameter of lattice crystallization were determined. Further arsenates were exposed to calorimetric research for determination of its thermal conduction. It is shown, that Hg3(AsO4)2 thermal conduction has maximum at 448 K and then it value is go down at 473 K and then smoothly increasing. It was supposed, such behavior is related with second kind phase transformation