Abstract
Trivalent thallium is precipitated in the presence of 0.1 M HNO 3 (or 0.05 M H 2SO 4) and O.1 M NH 4NO 3 (or 0.05 M (NH 4) 2SO 4) with oxalic acid. The chemical analysis of the salt obtained correspondens to the formula, NH 4[Tl(C 2O 4) 2]·3H 2O. The thermal decomposition studies of the complex indicate the formation of the intermediates ammonium thallous oxalate (stable from 150° to 160°C) and thallous oxalate (stable up to 290°C) and the final product to be a mixture of 25% of thallous oxide and 75% of thallic oxide (stable from 450° to 650°C). The infrared absorption spectra, X-ray diffraction patterns, microscopic observations and the electrical resistance measurements are used to characterise the complex and the intermediates of its thermal decomposition.
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