GROWTH OF SINGLE CRYSTALS OF INCONGRUENTLY MELTING YTTRIUM IRON GARNET BY FLAME FUSION PROCESS
Single crystals of yttrium iron garnet (Y/sub 3/Fe/sub 5/O/sub 12/) were grown using the flame fusion process, even though the compcund is reported to melt incongruently. The growth of these single crystals involves a mechanism different from that which has been proposed for the growth of single crystals of incongruently melting mullite. Crystal boules were grown at varying linear growth rates and analyzed with chemical, x-ray, and metallographic techniques. With high linear growth rates, the samples are uniformly polycrystalline and three-phase, containing Fe/sub 2/O/sub 3/, YFeO/sub 3/, and Y/sub 3/Fe/sub 5/O/ sub 12/. When slow linear growth rates are used, singlecrystal Y/sub 3/Fe/sub 5/ O/sub 12/ can be grown. The mechanism is discussed. At the beginning of growth the first phase to precipitate is YFeO/sub 3/, and during this stage in growth the molten cap becomes enriched in Fe/sub 2/O/, compared with the Y/sub 3/Fe/sub 5/O/sub 12/ composition. The liquid cap composition thus changes to the limit of the peritectic on the Fe/sub 2/O/sub 3/-rich side, and Y/sub 3/Te/sub 5/O/sub 12/ then crystallizes from the bottom of the melt as Y/sub 3/Fe/sub 5/O/sub 12/ powder is added to the top of the molten cap. The central sections of these boules are singlecrystal yttrium iron garnet. (auth)
- Research Organization:
- Linde Co., Indianapolis
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-14-005550
- OSTI ID:
- 4188293
- Journal Information:
- J. Am. Ceram. Soo., Vol. Vol: 43; Other Information: Orig. Receipt Date: 31-DEC-60
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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