Abstract
Rare earth and yttrium orthoferrites, RFeO3, where R is Y, Yb, Ho, and Tb, have grown under hydrothermal conditions from 20 ml KOH and NaOH solutions at 375°C, ∼8000 psi, and Δt=30° in the 〈110〉 and 〈001〉 directions at rates as great as 6 mil/day. Ease of growth appears to be inversely related to the ionic radius of R3+. TbFeO3 has been deposited on TbAlO3 seeds under similar conditions. The grown orthoferrite has excellent optical properties (much less OH than Y3Fe5O12 grown under similar conditions) and is of good perfection as indicated by Schulz pictures and optical scattering measurements. The proton concentration correlates with the alkali and alkaline earth concentration in the grown crystal and is lower than in garnet because the distribution constants for alkalies and alkaline earths are lower in the orthoferrite lattice. Hydrothermal growth appears to be an advantageous technique for the growth of large orthoferrite crystals for magnetic studies and applications.
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