Calcined Chevron-SSZ-24, the all-silica form of the AIPO4-5 (AFI) topology, undergoes a high–low displacive transition near 370 K, apparently involving re-orientation of tetrahedra, as evidenced by the three-fold displacement of the oxygen atoms linking 3D layers in the low-temperature form.
J. W. Richardson, J. V. Smith and S. Han, J. Chem. Soc., Faraday Trans., 1990, 86, 2341 DOI: 10.1039/FT9908602341
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