Abstract
To determine chemical composition and formation of a new calcium ferrite oxychloride which called A pattern found in the previous work, the characterization of calcium ferrite monochloride hydrates obtained at various compounding ratios (6.0/2.0-4.0/2.0) of CaO/FeCl3 and their heat-treated products were carried out by means of various instruments of XRD, FT-IR, TEM and SEM-EDX. Hydrates as starting materials before heat-treating are identified with a mixture of calcium ferrite monochloride hydrate and amorphous iron oxyhydroxide hydrate with partial carbonation by XRD and FT-IR studies. By electron microdiffraction study on the products heated at 600°C and 700°C, respectively, authors find new two orthogonal reciprocal patterns : B and C except A pattern. By supposing these B and C pattern to be orhorhombic symmetry lattice, principal diffraction lines of XRD pattern of heat-treating products are indexed reasonablly as orthorhombic lattice [B pattern : a=1.015 nm, b=1.781 nm and c=0.440nm] and orthorhombic lattice [C pattern : a= 0.740 nm, b=1.704 nm and c=0.510 nm], respectively. Probable chemical compositions of B and C pattern are estimated to be Ca1.6Fe2.0Cl0.8O4.2 and Ca1.9Fe2.0Cl0.4O4.7, respectively by EDX microanalysis.
