Mössbauer study of the thermal decomposition of alkali tris(oxalato)ferrates(III) |
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Authors: | A.S. Brar B.S. Randhawa |
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Affiliation: | Chemistry Department, Indian Institute of Technology, New Delhi-110016, India;Chemistry Department, Guru Nanak Dev University, Amritsar-143005, India |
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Abstract: | The thermal decomposition of alkali (Li,Na,K,Cs,NH4) tris(oxalato)ferrates(III) has been studied at different temperatures up to 700°C using Mössbauer, infrared spectroscopy, and thermogravimetric techniques. The formation of different intermediates has been observed during thermal decomposition. The decomposition in these complexes starts at different temperatures, i.e., at 200°C in the case of lithium, cesium, and ammonium ferrate(III), 250°C in the case of sodium, and 270°C in the case of potassium tris(oxalato)ferrate(III). The intermediates, i.e., Fe11C2O4, K6Fe112(ox)5. and Cs2Fe11 (ox)2(H2O)2, are formed during thermal decomposition of lithium, potassium, and cesium tris(oxalato)ferrates(III), respectively. In the case of sodium and ammonium tris(oxalato)ferrates(III), the decomposition occurs without reduction to the iron(II) state and leads directly to α-Fe2O3. |
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