| 摘要 |
PROBLEM TO BE SOLVED: To obtain the production method of an iron phosphate capable of forming a large crystal lattice by heating an iron phosphate expressed by FePO4 or Fe2 P2 O7 , allowing it into contact with oxalic acid and water or carbon monoxide and the water to form the iron phosphate having a specified main diffracted ray of X-ray diffraction spectrum. SOLUTION: The iron phosphate has the main diffracted rays of 2θ=12.18 deg., 2θ=24.48 deg. and 2θ=32.42 deg. at the X-ray diffraction spectrum and has a kaolin type (kaolin structure) exhibiting the structure in which a usual iron phosphate is intercalated. This is identified by the X-ray diffraction spectrum, and the main diffracted rays are peaks which have strength more than about 50 when the most strong peak is 100. Face distances corresponding to the main diffracted rays are d=7.27 Å (2θ=12.18 deg.), d=3.63 Å (2θ=24.48 deg.) and d=2.75 Å(2θ=32.42 deg.) respectively. A tridymite type iron phosphate, etc., are exemplified as the FePO4 and iron pyrophosphate is exemplified as the Fe2 P2 O7 . |
