Abstract:There are three main colors of luminescence in corundum (Al 2 O 3 ). First, the well-known red luminescence of Cr 3+ , second, the blue luminescence related to titanium and, third, the orange one which is the subject of this work. There are few discussions of the origin of this orange emission in corundum, except that it is believed to be related to a hole center. We characterized about 50 samples of mostly natural corundum from five different localities, synthetics and Be-diffused gems, using classical gemolo… Show more
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