Abstract
Tm and Y orthoferrite crystals with areas on the (001) face larger than 1 in.2 were grown. Optimum conditions were 20M (molal) KOH, 89% fill, 5% baffle opening, 385°C crystallization temperature, temperature differential 25°, and seeds {001} hydrothermally grown Y and TmFeO3 plates. Growth rates were about 1–4 mil/day. Bubble size, mobility, and other properties compared favorably with flux-grown crystals. Magnetically uniaxial garnets were crystallized from starting materials including (Gd, Tb)3Fe5O12, (Gd, Tb, Er)3(Al, Fe)2[(Fe, Al)O4]3, (Eu, Er)3(Ga, Fe)2[(Fe, Ga)O4]3 and (Y, Gd)3(Al, Fe)2[(Fe, Al)O4]3. Seeds were flux-grown crystals of similar composition. Orientation of the easy magnetic axis was usually similar to that observed in flux growth and properties compared favorably. Heteroepitaxial growth of (Eu, Er)3(Ga, Fe)5O12 on (Nd0.2Gd0.8)3Ga5O12 was achieved. Optimum conditions for homoepitaxial garnet growth were generally similar to those for orthoferrite. In garnet growth most experiments were conducted at 87% fill and with a ΔT (temperature difference between dissolving and growth zone) of 40°C. Ga2O3 was added to reduce the magnetic moment of the crystallized material.
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