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EC number: 208-933-7
CAS number: 547-67-1
DTA peaks closely corresponded to the weight
changes observed on the TG curves. The curves showed that the thermal
decomposition of the test substance below 500 deg C occurs in two
well-defined steps. The first step is from 196 to 284 deg C,
characterized by a endothermic peak at 258 deg C in accordance with
calculated weight loss of 19.73%, attributed for the dehydration of
nickel oxalate dihydrate and formation of anhydrous oxalate. The
anhydrous oxalate is stable up to 316 deg C, and then decomposed in the
second step. This step shows an exothermic process with DTA peak at 365
deg C, indicating a weight loss of 39.85% due to the decomposition of
nickel oxalate and the formation of NiO (the decomposition product NiO
was identified through X-ray diffraction). The exothermic character of
the DTA peak accompanying the oxalate decomposition step is due to the
air oxidation of CO to CO2 , which is the common fact in thermal
decomposition of metal oxalate in air.
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