Structural study of the aluminophosphate AlPO4-5 by neutron powder diffraction

The structures of an aluminophosphate AlPO4-5 produced by a microwave-heati ng method were determined by neutron powder diffraction, An as-prepared sam ple incorporating triethylamine as a template crystallized in hexagonal for m with space group P6cc, Template molecules were oriented in a head-to-tail manner along the c-axis. On the contrary, a sample calcined to remove trie thylamine was orthorhombic with space group Pnn2 or Pcc2, The framework of AlPO4-5 proved to change easily by removing the guest material from its one -dimensional cavity. (C) 1999 Elsevier Science Ltd. All rights reserved.