Patent ID: 6180073
Filing Date: 2001-01-30
Classification: C01F,C01G,C09K,Y10T

Abstract:
A process for the preparation of a compound of formula AB.sub.2 S.sub.4, wherein A represents one or more alkaline-earth metals and B represents at least one element selected from aluminum, gallium and indium, wherein said compound is in the form of a powder with a residual oxygen content of not more than 1.5%, said process comprising the steps of:a) forming a solution or a suspension comprising salts of the elements A and B, and, optionally, of a doping element,b) drying the solution or the suspension by atomization,c) reacting the product obtained in the preceding step with carbon disulphide, hydrogen sulphide or with a gaseous mixture of hydrogen sulphide and or carbon disulphide, andd) recovering said compound.