Single crystals of SrPrGaO_{4} and SrLaGaO_{4} have been grown using the Czochralski technique. Both materials melt incongruently at 1462°C and 1516°C. The non-stoichiometric crystals contain more strontium than the starting melts. Constitutional supercooling is retarded by special growth conditions and optimum melt composition. Because of their small mismatch both crystals are recommended as substrates for YBa_{2}Cu_{3}O_{7-x} epitaxy.
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