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Abstract
Stoichiometric magnesium aluminate spinel single crystals grown by the flux, Czochralski, and Verneuil methods have been characterized for their dielectric and optical properties. Dielectric properties were determined from capacitance measurements in the frequency range 102–105 Hz. The dielectric constant and loss tangent of spinel crystals grown by the various methods are comparable. At 1 kc the spinel has a dielectric constant of 8.4 and a loss tangent of 10−4. Optical transmission and reflection measurements were made in the wavelength range uv to IR (0.2–40 µm). Optical characteristics of the crystals are highly dependent on the method of growth. Chromium‐doped spinel single crystals have also been grown by a flux technique. Optical emission and absorption characteristics of Cr+3 in flux‐grown spinel have been studied. The results are compared with those of Cr+3 in natural spinel and synthetic spinel crystals prepared by the Czochralski and Verneuil methods.
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