CRYSTALLINE MATERIAL, PROCESS FOR PRODUCING IT AND USE THEREOF

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The present invention relates to a crystalline material comprising a basic crystal based on at least one host element (We), which basic crystal is doped with at least one element, of the rare earths (Do), the crystalline material having the formula : Wel(a)We2(b)Ta(c)Dol(d)Do2(e)Hal(w)0(x)Te(y)Se(z)