Abstract
100 mm diameter single crystals with a length of 60 mm have been reproducibly grown by the vertical gradient freezing method. These single crystals were grown in the 〈111〉 direction and were free of any twins and grain boundaries. The average etch pit density using Nakagawa etching was (4–6) × 10 4 cm −2 in the whole ingot. Rocking curves using a five-crystal X-ray diffractometer showed that the full widths at half maximum were in the range of 8–13 arc sec. Electrical resistivities at room temperature were 30–37 Ω · cm. The present single crystals are the largest ever reported so far which have a satisfactory quality.
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