A gel aging effect in the synthesis of open-framework gallium phosphates: structure solution and solid-state NMR of a large-pore, open-framework material.

ABSTRACT: The templated zeolite-analogue GaPO-34 (CHA structure type) crystallises from a gel precursor Ga₂O₃ : 2H₃PO₄ : 1HF : 1.7SDA : 70H₂O (where SDA = structure directing agent), treated hydrothermally for 24 hours at 170 °C using either pyridine or 1-methylimizadole as SDA and one of either poorly crystalline ε-Ga₂O₃ or γ-Ga₂O₃ as gallium precursor. If the same gels are stirred for periods shorter than 2 hours but treated under identical hydrothermal conditions, then a second phase crystallises, free of GaPO-34. If β-Ga₂O₃ is used as a reagent only the second phase is found to crystallise, irrespective of gel aging time. The competing phase, which we denote GaPO-34A, has been

SUBMITTER: Broom LK 

PROVIDER: S-EPMC5789431 | biostudies-literature | 2017 Dec

REPOSITORIES: biostudies-literature