Abstract
Yttrium‐iron garnet has been shown to be the stable solid phase, congruently saturating, and not subject to reduction in 50 wt% NaOH between 350° and 425°C at pressures from 200 to 1350 atm. Substantial diffusivity of hydrogen through platinum and gold has been shown to lead to the formation of Fe3O4 in garnet syntheses attempted in platinum or gold capsules where water was the pressure‐transmitting fluid. Yttrium‐iron garnet has been grown on a seed crystal under the following conditions: crystallization temperature, 370°C; dissolving temperature, 420°C; pressure, 200 atm; and solvent, 50 wt% NaOH. The rate of crystallization was 0.08 mm per day in the (111) direction.
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