High-purity Ag powder

The maturity of GD-MS as a technique capable of routinely providing complete chemical analyses at the ultratrace level for insulating solid materials has clearly been demonstrated by quantification of a full range of elements (from Li to U) in coal and coal fly ash [643]. The samples were mixed with high-purity Ag powder as the binder and pressed into a pin shaped pellet by means of a polypropylene mold. Critical steps in the determination process were the inhomogeneous distribution of elements within and among the fly ash particles and the purity of the binder. The presence of highly volatile compounds hindered the application to bituminous coal. 

An efficient analytical procedure for the trace impurity analysis of Mg, K, Cr, Mn, Fe, Ni, Co, Cu, Zn, Ag, Cd, Ba and Pb in high purity silicon powder after a very simple matrix separation via microwave assisted volatihzation of silicon as silicon fluorides, was proposed by Ueng el al.59 The authors observed a nearly 99 % volatihzation of the matrix element silicon from the... 

Phase equilibria have been established in the ternary Nd-Ag-Ge system over the whole concentration region for the isothermal sections at 870 K and 1070 K by Salamakha et al. (1996f) and Zaplatynsky et al. (1996) (figs. 67a,b). The existence of four and five ternary compounds respectively have been observed. Samples were melted from pieces of high purity components (Nd 99.85 mass%, Ag 99.99 mass%, Ge 99.99 mass%) under argon atmosphere in an arc furnace with water-cooled copper hearth. The ingots were subsequently annealed at 870 K (1070 K) and quenched in cold water. The isothermal sections were constructed using X-ray powder diflraction film data obtained by the Debye-Scherrer technique with non-filtered CrK radiation. 

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