STUDIES ON THE BASIC CARBONATES OF NICKEL Part V: Thermogravimetric Behaviour of Basic Nickel Carbonates

Abstract

The thermogravimetric behaviour of bask nickel carbonates was investigated making use of a quartz-fibre spring balance. The basic nickel carbonates showed two distinct stages of decomposition when they were subjected to thermal treatment at a slow rate of heating. The first stage, corresponding to the expulsion of part of the water, started at lOO degree C, and was complete at 210°C. The second stage started above 260°C, when the basic carbon are decomposed giving off the rest of the water and the carbondioxide contained in it and this reaction was complete at 420°C. The final product of decomposition was found to be nickel oxide. The results are interpreted in the light of the different natures of the water held by the basic carbonates.