Cathodoluminescence of zinc oxide crystals grown from melt {under|below|beneath} {high|higher} {pressure|stress} {in the|within the|inside the} presence of ytterbium oxide
A mixture of poly- and single crystals of zinc and ytterbium ({2|two} at.%) oxides {have been|happen to be|have already been} grown {from the|in the} melt at {high|higher} temperature (1430°C) and…