Portal de Periódicos da CAPES

Thermal Expansion of Lithium Sulphate

1983; De Gruyter; Volume: 38; Issue: 12 Linguagem: Inglês

10.1515/zna-1983-1218

1865-7109

B. E. Meilander, L. Nilsson,

Thermal and Kinetic Analysis

Abstract The thermal expansion of the α and β phases of lithium sulphate has been studied using dilatometric and X-ray diffraction techniques. In the α-phase the coefficient of linear thermal expansion is 4.6·10 -5 K -1 while in the β-phase the coefficient of linear thermal expansion increases from 0.9·10 -5 K -1 at room temperature up to 3.4·10 -5 K -1 close to the first order phase transition at 575 °C. The volume expansion at the phase transition is 3.2%. In the α-phase the thermal Grüneisen parameter has been calculated to be 0.63 at 705 °C.