THERMAL-CHANGE OF SNI2 THIN-FILMS .4. TG-DTA AND DSC

A thermal change of a tin iodide (SnI2) evaporated film as deposited on a glass substrate has been successfully detected by TG-DTA and evaluated semiquantitatively by DSC in nitrogen and air (heating rate 10 degrees C min(-1)); the film area was approximate to 0.5 and approximate to 0.25 cm(2) for TG-DTA and DSC, respectively. In nitrogen, a sharp endothermic peak at 317.9 degrees C was interpreted as denoting the melting of SnI2; an endothermic weight loss at 260-420 degrees C was interpreted as the sublimation and evaporation of SnI2. An exothermic weight loss at 180-290 degrees C in air was interpreted as the oxidation reaction proposed in our previous papers [Thermochim. Acta, 232 (1994) 29-36; 232 (1994) 37-45; 243 (1994) 95-100], namely 2SnI(2)(s) + O-2(g) --> SnO2(s) + SnI4(g).