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METHOD FOR OBTAINING OF POLYCRYSTALLINE BLOCKS OF RARE EARTH METAL HALIDES, POLYCRYSTALLINE BLOCKS AND MONOCRYSTALLS ARE OBTAINED FROM POLYCRYSTALLINE BLOCKS
METHOD FOR OBTAINING OF POLYCRYSTALLINE BLOCKS OF RARE EARTH METAL HALIDES, POLYCRYSTALLINE BLOCKS AND MONOCRYSTALLS ARE OBTAINED FROM POLYCRYSTALLINE BLOCKS
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机译:稀土金属卤化物的多晶嵌段的获得方法,多晶嵌段的多晶嵌段和单晶的获得
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摘要
The invention concerns a method for preparing a polycrystalhne hahde block, of formula ALnX, wherein Ln represents one or more rare earth(s), X represents one or more halogen atom(s) selected among Cl, Br or I and A represents one or more alkali(s) such as K, Li, Na, Rb or Cs, e may be nil, being not more than 3f and f being not less than 1, with low water and oxyhalide content Said method comprises the following steps heating a mixture of at least one compound containing at least one Ln-X bond and a sufficient amount of NH^X to obtain the desired oxyhalide content, said step resulting in a melt including the rare earth hahde, said heating step being followed by a cooling step, the heating step, after reaching 300°С never falling below 200°С before the melt is obtained The resulting blocks enable growth of very pure single crystals with remarkable scintillating properties.
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