Mass-spectrometric study of the vaporization of tin oxides. Dissociation energy of SnO

Abstract

The evaporation of tin oxide SnO2 and mixtures of tin and tin oxide was studied. The vaporization reactions are 1 1SnOz(s) *$sno),(g) + 5 0 2 9 (n = 1, 21, 1 1 1 -Sn(s,l)+zSnO~(s) -.;;(SnO),,(n = 1,2,3,4.) 2The dissociation energy of the molecule SnO was determined : Dg = 126.5+2.0 kcal/mole ; as well as the polymerization energies = 66.814, 136.515, 207.6f5 kcal/mole for (Sn0)2, (Sn0)S snd (SnO)4 respectively. A re-interpretation of the total vapour pressures given in the literature was made. The presence of the polymeric molecules is the cause of previously unexplained differences.* The research reported in this document has been sponsored in part by Air Force Materials Laboratory, Research and Technology Division, AFSC under Contracts AF 61 (052)-225 and -764 through the European O f f i c e of Aerospace Research (OAR), United States Air Force.

The 115Sn, 117Sn and 119Sn nuclear spin-rotation constants in stannous monoxide, SnO, and a new multi-isotopomer analysis

“…This agrees well with a value of 526 kJ mol À1 [26] determined from an extrapolation of data from the E-X electronic transition, and also the D 0 value of 529(8) kJ mol À1 , determined using a mass spectrometric technique [27].…”

Volatilization behavior of SnO2 reduced under different CO–CO2 atmospheres at 975°C–1100°C

“…From the view of thermodynamics, SnO (s) with big saturated vapor pressure was readily to volatilize as the form of SnO (g) under high temperatures and the saturated vapor pressure increases with the rising of roasting temperature (Colin et al, 1965).…”

Matrix Isolation Studies of Group IV Oxides. III. Infrared Spectra and Structures of SnO, Sn2O2, Sn3O3, and Sn4O4

“…Mass spectrometric studies3 show that under nonreducing conditions the vaporization of solid Sn02 yields predominantly SnO and O 2 , together with a small proportion of Sn202. Mixtures of Sn/Sn02, however, produce significant amounts of SnO, Sn202, SnaOa, and Sn 4 04.…”