PRODUCTION OF AN ELPASOLITE-TYPE SCINTILLATOR MATERIAL

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The invention relates to a method for producing a crystalline scintillator material with an elpasolite-type structure of a theoretical composition A2BC(1-y)MyX(6-y) wherein : A is selected from Cs, Rb, K, Na; B is selected from Li, K, Na; C is selected from the rare earths, Al, Ga; M is selected from the alkaline earths; X is selected from F, Cl, Br, I; and y is the atomic fraction of substitution of C by M and is comprised in the region of between 0 to 0.05; comprising the crystallisation thereof by cooling from a molten bath comprising r moles of A and s moles of B, the molten bath being in contact with the material containing A and B such that 2s/r is higher than 1. The method exhibits an improved production yield. Furthermore, the crystals produced can have compositions which are closer to the stoichiometry and have improved scintillation properties.