Thermal behaviour of thallium(I) chlorate
01 Jul 1976-Thermochimica Acta (Elsevier)-Vol. 16, Iss: 1, pp 128-131
About: This article is published in Thermochimica Acta.The article was published on 1976-07-01. It has received 2 citations till now. The article focuses on the topics: Chlorate & Thallium.
TL;DR: In this article, a trivalent thallium is precipitated in the presence of oxalic acid and the resulting mixture is shown to be a mixture of 25% of thallous oxide and 75% of ammonium-thallous oxalate.
Abstract: Trivalent thallium is precipitated in the presence of 0.1 M HNO 3 (or 0.05 M H 2 SO 4 ) and O.1 M NH 4 NO 3 (or 0.05 M (NH 4 ) 2 SO 4 ) with oxalic acid. The chemical analysis of the salt obtained correspondens to the formula, NH 4 [Tl(C 2 O 4 ) 2 ]·3H 2 O. 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.
TL;DR: In this paper, the thermal decomposition characteristics of thallous perchlorate were investigated in nitrogen and in air using TG and DTA techniques, and it was shown that the relative amounts of the decomposition products depend upon both the temperature and the atmosphere around the sample.
Abstract: Thermal decomposition characteristics of thallous perchlorate are investigated in nitrogen and in air using TG and DTA techniques. Isothermal studies at 380°, 400°, 420° and 440° in air and in nitrogen showed that the relative amounts of the decomposition products, namely, thallic oxide and thallous chloride, depend upon both the temperature and the atmosphere around the sample. At low pressures (5×10−1 mm/Hg) there is volatilization of thallous perchlorate even at 200°.