LAUSR

Abstract Two microporous gallium phosphates substituted by Fe and Co: NH4[Ga2Fe(PO4)3(H2O)2] (1) and NH4[Ga2Co(PO4)3(H2O)2] (2) have been ionothermally synthesized by using the ionic liquid [Bmim]Br as structure-directing agent and solvent. X-ray single crystal diffractions show that 1 and 2 are isostructural and possess 3D channel filled by ammonium groups. The morphologies of compounds 1 and 2 are characterized by scanning electron micrographs (SEM). Effects of P2O5/Ga2O3 ratio on the crystallization of compound 2 are investigated. The optimal synthesis condition with the molar composition of Ga2O3:6P2O5:3.6HF:3Co salt:40[Bmim]Br is determined, and X-ray powder diffraction indicates that the compound 2 is pure crystalline phase under the optimal conditions. The thermogravimetric analysis shows that the framework of 2 collapses at temperatures above 460 °C. Compound 2 exhibits antiferromagnetic property by magnetic test.