Accession Number : AD0739304

Title :   Differential Thermal Analysis Studies on Ag2CO3,

Corporate Author : DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)

Personal Author(s) : Nagy,G. D. ; Vergette,J. B. ; Connolly,J. P.

Report Date : 01 MAR 1971

Pagination or Media Count : 9

Abstract : The decomposition and phase transitions that occur during the heating and cooling of Ag2CO3 were studied by differential thermal analysis at heating rates of 7 to 14C per min. In helium, the Ag2CO3 was partially decomposed evolving CO2(7-35% depending upon the method of preparation) giving rise to peaks at 190 to 200C; at 350 to 400C, two endothermic peaks were observed at which CO2 and O2 were given off simultaneously, leaving silver metal. In CO2 the initial partial decomposition gave rise to a peak at about 265C. The partially decomposed Ag2CO3(Ag2O.nCO2, where n is less than one) gave the same X-ray diffraction pattern as Ag2O, which slowly converted to that for Ag2CO3 if left exposed to air or CO2. The Ag2O.nCO2 behaves like a clathrate-type of structure in which CO2 can be entrapped in the Ag2O lattice. (Author)

Descriptors :   (*SILVER COMPOUNDS, *DIFFERENTIAL THERMAL ANALYSIS), (*PYROLYSIS, SILVER COMPOUNDS), CARBONATES, CARBON DIOXIDE, CHEMICAL EQUILIBRIUM, OXIDES, PHASE STUDIES, CANADA

Subject Categories : Inorganic Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE