Ammonium Iron(II,III) Phosphate: Hydrothermal Synthesis and Characterization of NH4Fe2(PO4)2
- 28 January 1998
- journal article
- research article
- Published by American Chemical Society (ACS) in Inorganic Chemistry
- Vol. 37 (4) , 799-803
- https://doi.org/10.1021/ic970655+
Abstract
The mixed-valence iron phosphate NH4Fe2(PO4)2, which was synthesized by the high-temperature, high-pressure hydrothermal method, crystallizes in the monoclinic space group C2/c with a = 20.0066(1) Å, b = 14.8319(2) Å, c = 9.9899(1) Å, β = 119.278(1)°, and Z = 16. Its compact structure consists of chains of edge-sharing FeIIO6 octahedra and chains of corner-sharing FeIIIO6 octahedra and PO4 tetrahedra. These chains are connected to each other and delimit tunnels in the [221], [22̄1], and [001] directions, in which NH4 + cations are located. Mössbauer spectroscopy confirms the presence of FeII and FeIII. The title compound is the first example of a mixed-valence ammonium iron phosphate.Keywords
This publication has 12 references indexed in Scilit:
- A 3-D Organically Templated Mixed Valence (Fe2+/Fe3+) Iron Phosphate with Oxide-Centered Fe4O(PO4)4 Cubes: Hydrothermal Synthesis, Crystal Structure, Magnetic Susceptibility, and Mössbauer Spectroscopy of [H3NCH2CH2NH3]2[Fe4O(PO4)4]·H2OChemistry of Materials, 1997
- Hydrothermal Synthesis, Structure, and Magnetic Properties of a Novel Monodimensional Iron Phosphate: [FeF(HPO4)2,N2C3H12,(H2O)x] (x ≈ 0.20) (ULM-14)Inorganic Chemistry, 1997
- [H3N(CH2)3NH3]Fe2 O(PO4)2: a novel layered iron phosphate containing tetramers of FeO5 trigonal bipyramidsChemical Communications, 1997
- Large tunnels in the hydrothermally synthesized open-framework iron phosphate [H3N(CH2)3NH3]2[Fe 4(OH)3(HPO4)2(PO4) 3]·xH2OChemical Communications, 1997
- [HN(CH2CH2)3NH]3[Fe8 (HPO4)12(PO4)2(H 2O)6]: an organically templated iron phosphate with a pillared layer structureJ. Chem. Soc., Dalton Trans., 1997
- Na7Fe4(PO4)6: a mixed-valence iron phosphate containing a tetramer of edge-sharing FeO6 octahedraJ. Chem. Soc., Dalton Trans., 1996
- Am3(P2O7)2 (A = alkaline-earth metals; M - iron, cobalt, nickel): diphosphates containing infinite chains of edge-sharing MO6 octahedraInorganic Chemistry, 1993
- Clarification of ammonium polyphosphate fertilizer solutionsJournal of Agricultural and Food Chemistry, 1972
- Insoluble compounds in ammonium polyphosphate made from wet-process phosphoric acidJournal of Agricultural and Food Chemistry, 1968
- Mineralogical Character of Some Iron and Aluminum Phosphates Containing Potassium and AmmoniumSoil Science Society of America Journal, 1951