Dissociation and Vaporization of Gold Chlorides and Gold Bromides.
Visnapuu-A; Marek-BC; Jensen-JW
NTIS: PB 200 697 :22 pages
Dissociation and vaporization of gold chlorides and bromides were investigated by a static pressure method and by knudsen cell mass spectrometer. Two distinct chlorine and three distinct bromine pressure-temperature relationships were observed for the respective salts. The chlorine pressures are attributed to the dissociation of au2cl6 and au2cl2 and the bromine pressures to the dissociation of au2br6, au2br4, and au2br2. These pressure-temperature relationships were used to calculate dissociation pressure equations, enthalpies, and entropies of dissociation for each salt. Mass analysis of the vapors over au2cl6 between 83 deg and 152 deg c confirmed the existence of gaseous au2cl6. Ionization potential of this molecule is 11.0+/-0.1 Ev and enthalpy of vaporization is 28.1+/-2.0 Kcal/mole. Mass analysis of the vapors over the gold bromides detected only br2 in the temperature range 15 deg to 150 deg c.
IH; Report of Investigation;
NTIS Accession No.
NTIS: PB 200 697