Growth of Beryl Single Crystals for Microwave Applications

Beryl crystals containing transition metal ions can he grown from a number of mineralizing fluxes. Of these ${\mathrm{V}}_2{\mathrm{O}}_5$ appears to be particularly advantageous for growing beryl by transfer methods. The ${\mathrm{Cr}}^{\text{3+}}$ containing crystals grown by this method are particularly suitable for microwave device applications as indicated by a resonance linewidth of 100 Mc at the X band.