RARE EARTH AND ALKALI SULFIDE, PROCESS FOR PREPARING SAME, AND USE THEREOF AS COLORING PIGMENT

摘要

A rare-earth and alkali sulphide, a method for preparing same and the use thereof as a pigment, are disclosed. The sulphide has formula ABS2, wherein A is at least one alkali and B is at least one rare earth, and consists of grains having an average size no greater than 1.5 mu m. The method for preparing said sulphide comprises exposing at least one rare-earth carbonate or hydroxycarbonate to at least one alkaline element compound, then heating them in the presence of at least one gas selected from hydrogen sulphide or carbon sulphide, and optionally deagglomerating the resulting material. The sulphide may be used as a pigment in plastics, paints, surface coatings, rubbers, ceramics, glazes, papers, inks, cosmetics, dyes, laminated coatings and materials containing or produced from at least one inorganic binder.