Producing rare earth oxysulfide useful for producing sintered ceramic, which is useful e.g. in medi

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The invention relates to a method for producing a [...] , comprising the steps of forming a binary rare earth sulfide by reacting a rare earth oxide with polysulfide under reducing conditions and the conversion of the resultant binary [...]rare earth sulfide to a. The invention describes further a according to one process of the present invention, as well as a comprehensive shining product[...] this being fabricated.