| abstract |
The invention relates to a sintered shaped body comprising a matrix material that contains an aluminum oxide/chromium oxide mixed crystal and an additional mixed crystal selected from at least one mixed crystal according to one of the general formulas La0,9Al11,76-xCrxO19, Me<1>Al11-xCrxO17, Me<2>Al12-xCrxO19, Me<2'>Al12-xCrxO19 and/or Me<3>Al11-xCrxO18, wherein Me<1> stands for an alkali metal, Me<2> represents an alkaline earth metal, Me<2'> stands for cadmium, lead or mercury and Me<3> represents a rare earth metal and x has a value ranging from 0.0007 to 0.045. |