Silver - Arsenic - Potassium

Sigurd Jönsson

Introduction

The ternary compounds K₂AgAs [77Sav] and K₃Ag₃As₂ [79Sav] were prepared by heating stoichiometric mixtures of the elements in a silver crucible in an argon atmosphere. For the K₂AgAs sample, a surplus of 10% K was used with respect to its evaporation. The mixture was heated up to 600°C for 24 h and slowly cooled down [77Sav]. The K₃Ag₃As₂ sample was heated up to 700°C and cooled down to room temperature by 100 K•d^-1 [79Sav]. The crystal structure was determined from Weißenberg and precession photographs.