THERMAL-OXIDATION OF ZNS MODIFICATIONS SPHALERITE AND WURTZITE

The oxidation of phase pure ZnS in the wurtzite and sphalerite modific ation upon heating in an air flow has been studied by simultaneous the rmogravimetry-differential thermal analysis and in-situ X-ray diffract ion at high temperature (high temperature camera and electron synchrot ron). The oxidation of wurtzite starts at higher temperature, ZnO is f ormed without any detectable side or intermediate products. Sphalerite oxidation starts at lower temperature, ZnSO4 and Zn3O(SO4)(2) are for med intermediately in side reactions yielding finally ZnO.