Single crystals of nanoporous 12CaO·7Al 2 O 3 (C12A7) as large as 27 mm in diameter, 120 mm in length, and 207 g in weight have been successfully grown by the Czochralski method. We found that a 2.0% oxygen-containing nitrogen atmosphere and an iridium crucible are the critical factors for success. The crystal ingot exhibited an orange color resulting from the incorporation of Ir 4+ ions of ca. 5 × 10 17 cm -3, which presumably occupy Ca 2+ sites. X-ray diffraction analysis indicated that the ingot obtatined was a single crystal with few domains.
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Kurashige et al. (2006) studied this question.
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