Muiambo, Herminio FranciscoFocke, Walter WilhelmAtanasova, Maria TodorovaVan der Westhuizen, IsbeTiedt, Louwrens R.2011-02-182011-02-182010-09Muiambo, HF, Focke, WW, Atanasova, M, Van der Westhuizen, I & Tiedt, LR 2010, 'Thermal properties of sodium-exchanged Palabora vermiculite', Applied Clay Science, vol. 50, no. 1, pp. 51-57. [http://www.elsevier.com/locate/issn/01691317]0169-131710.1016/j.clay.2010.06.023http://hdl.handle.net/2263/15874Palabora “vermiculite” represents an interstratified vermiculite-biotite containing less than 50% vermiculite. The sodium-exchanged form was prepared by immersion in saturated brine at ambient conditions. The sodium content reached the equilibrium level within the first month of exposure. However, XRD diffractograms continued to evolve and sharpen over a six-month period. The thermal-activated exfoliation was studied using thermo-mechanical analysis. The expansion of the neat “vermiculite” commenced at temperatures above 420 °C. Sodium exchange decreased the onset temperature by about 120 °C. The linear expansion reached a maximum of about eight-fold at temperatures around 700 °C and decreased again at higher temperatures.en© 2010 Elsevier B.V.VermiculiteIon exchangeMixed-layerInterstratificationExfoliationSodium saltsVermiculite -- Thermal propertiesIon exchangePostprint Article