A new simultaneous apparatus for X-ray diffractometry and differential scanning calorimetry (XRD-DSC)

An instrument was developed for performing simultaneous X-ray diffractometr ic and differential scanning calorimetric (XRD-DSC) measurement using a pow er compensation DSC (pc-DSC). The feasibility of the technique is demonstra ted by examining the thermal dehydration measurement of zinc formate dihydr ate (Zn(HCO2)(2). 2H(2)O). The DSC curve shows apparent double endothermic peaks during the dehydration process, while X-ray diffraction analysis indi cated that the resulting anhydrous product, Zn(HCO2)(2), was crystalline. T he simultaneous measurement reveals that the DSC curve arises from a combin ation of the endothermic dehydration peak and the exothermic crystallizatio n peak which resulted from the progression of the anhydrous products. (C) 1 999 Elsevier Science B.V. All rights reserved.