The Formation of a Tin Dioxide Sol during Electrolysis
of a Tin(IV) Chloride Solution

L. M. Sharygin, V. I. Barybin, and S. M. Vovk

“Termoksid” Production–Research Company, Zarechnyi, Sverdlovsk oblast, 624051 Russia

Received June 28, 1996

Abstract—In the process of electrolysis of a SnCl₄ solution, the dimensions of polymeric tin–oxygen com-
plexes (chlorostannic acids) increase as the Cl/Sn atomic ratio decreases. In these complexes, the fraction of
Sn–O internal bonds with dimensions characteristic of cassiterite increases, whereas the fraction of the Sn–Cl
end bonds decreases, and a sol with the crystalline structure of particles is formed. The colloidal particles have
a radially nonuniform structure: the core of a particle consists of tin dioxide of the cassiterite modification,
whereas the surface layer is composed of tin oxy- and hydroxychloride. The colloidal processes of the forma-
tion of the tin dioxide sol during the electrolysis of a tin tetrachloride solution in a two-compartment electro-
lyzer are similar to the processes occurring during the electrolysis of a SnCl₄ solution in a three-compartment
electrolyzer. The current efficiency for chlorine during electrolysis in the two-compartment electrolyzer is
higher than that in the three-compartment one.

Pleiades Publishing home page | journal home page | top

If you have any problems with this server, contact webmaster.