日本ゼオライト学会　刊行物 Publication of Japan Zeolite Association

Cubic-faujasite (Cub-FAU), hexagonal-faujasite (Hex-FAU) and cubic-hexagonal-faujasite (Cub-Hex-FAU) crystals, which were synthesised using 15-crown-5, 18-crown-6 and their mixtures as templates, were studied by scanning and transmission electron microscopes (SEM and TEM). Cub-FAU and Hex-FAU crystals show external shapes of cuboctahedron and hexagonal plate, respectively, and they are compatible with their crystal symmetries. From the arrangement of channels determined by high resolution TEM images (HREM images), the crystal structures are distinguished between cubic and hexagonal. The details of the intergrowth in Cub-Hex-FAU crystal can only be obtained by the HREM images.