Ceramics-Silikáty 47, (2) 51 - 55 (2003) |
|
VOLTAMMETRIC MEASUREMENT OF THE Pt ELECTRODE CAPACITY AND THE DETERMINATION OF THE POLYVALENT IONS DIFFUSION COEFFICIENTS IN THE GLASS MELT
|
Vondrák Jiří 1, Rohanová Dana 2, Klápště Břetislav 1,
Velická Jana 1
|
1 Institute of Inorganic Chemistry, Academy of Sciences of the Czech Republic, 250 68 Řež, Czech Republic
2 Laboratory of Inorganic Materials
Joint Workplace of the Institute of Inorganic Chemistry of the Academy of Sciences of the Czech Republic
and the Institute of Chemical Technology Prague
Technická 5, 166 28 Prague, Czech Republic
|
Keywords: Electric capacity of Pt electrode, Polyvalent ions, Fe³⁺ and Cr³⁺ ions, Ion diffusion coefficients, Glass melt
|
The cyclic voltammetry has been used to investigate the kinetic behaviour of polyvalent ions in a silicate glass melt within a
temperature range from 900 to 1300°C. Standard potentials of oxidation-reduction reactions of the polyvalent elements present
in glass melt as refining or colouring agents (Fe and Cr) were measured. Diffusion coefficients of Fe³⁺ and Cr³⁺ ions in
the melt were calculated from the shape of cyclic voltammograms. Their values were found from 10⁻⁹ to 10⁻⁷ cm² s⁻¹ respectively.
Double layer capacity (480 μ F/cm²) measured in the basic glass without of polyvalent elements corresponds to the high concentration
of ions in the melt. |
 PDF (0.5 MB) |
|
