Dissolution behavior of palladium and rhodium in glass melts: Implications for the viscosity and electrical conductivity of high-temperature melts.

This article investigated the solubility of platinum group metals (PGMs) in sodium borosilicate glass and its effect on the viscosity and electrical conductivity of melts. The role of PGMs in the viscosity and electrical conductivity of melts was examined using the rotating cylinder method and impedance spectroscopy, respectively. Moreover, XRD, XPS, and SEM were used to measure the phase compositions, valence states, and microstructures, respectively, of the glass samples with different PGMs contents. The results showed that the solubility of Pd and Rh in sodium borosilicate glass was estimated to be less than 110 ppm by weight. The higher concentrations of Pd and Rh resulted in Pd-rich and Rh-rich inclusions in the glass matrix, which eventually agglomerated to form metallic Pd, Rh and Rh 2 O 3. The evolution of viscosity and electrical conductivity with different temperatures followed the Arrhenius equation with a fairly good linear relationship between ln η and ln κ. • The solubility of PGMs in borosilicate glass was less than 110 ppm by weight. • The aggregation and crystallization trends of PGMs in glass were investigated. • The temperature dependence of viscosity and conductivity of glass melts obeyed Arrhenius equation at high temperature region. • The viscous/electrical activation energy of glass melts containing 0–1 wt% PGMs was calculated. • The impact of PGMs concentration on the structure of PGMs aggregates had a nonlinear threshold effect. [ABSTRACT FROM AUTHOR]