MOSSBAUER-EFFECT STUDIES ON THERMAL-DECOMPOSITION OF IRON(III) HYDROXY-BENZOATES AND AMINO-BENZOATES

The thermal decomposition of iron(III) aminobenzoates (o-, m-, p-) and iron(III) hydroxybenzoates (o-, m-, p-) have been investigated from a mbient temperature to 873 K in air using derivatography DTG-DTA-TG, Mo ssbauer, IR spectroscopy and XRD. The importance of Mossbauer spectra recorded at various stages of heating, without separating the product mixture, in studying the mode of decomposition is highlighted. The int ermediates (e.g., Fe(II)-species) were confirmed. The nature of water of hydration and the order of stability (P->m->o-) have been investiga ted from decomposition temperatures. The kinetic model and parameters have been investigated for dehydration.