The Electrical Conductivity of Molten Oxides

Abstract

Electrical conductivities of some molten oxides have been determined. In order of decreasing equivalent conductances a t their melting points the oxides investigated were: LitO, I'bO, TeO?, Moo?, BitO3, V?Os, Sb,Oa, an! CrOS. The variation of the observed values of the s~e c~f i c conduct~vities. K. w~t h the absolute tern-, , perature, T, can be described b; an equation of the form,where A , B, C , etc. are constants. While the experimental data are adequately described by an equation of this form containing only the constants A and B, a sliahtlv better tit is obtained usinn three constants. The conductivities of the mzlten oxides follow a pattern of -variation from element to element which is substalltially the same as that of the molten halides. For elements giving more than one oxide stable in the molten state, the oxide corresponding to the highest state of valency has the lowest conductivity. Manzrscribt

Flash Microwave Sintering of Transparent Yb:(LaY)2O3 Ceramics

“…We have no data on the high‐temperature electrical conductivity of the 5 at.% Yb 3+ doped (La 0.1 Y 0.9 ) 2 O 3 composition. However, it should be noted that the obtained values are slightly less than the conductivity of pure Y 2 O 3 above the melting point, which equals 0.9 (Ω·cm) −1 …”

“…However, it should be noted that the obtained values are slightly less than the conductivity of pure Y 2 O 3 above the melting point, which equals 0.9 (ΩÁcm) À1 . 30 An SEM study of the surfaces of a sample microwave heated at a rate of 200°C/min to 1500°C has revealed that the surface relief is uneven on the grain size scale (Fig. 6, a).…”

Electrochemical Study of a Pendant Molten Alumina Droplet and Its Application for Thermodynamic Property Measurements of Al-Ir

“…Assessment of Al 2 O 3 conductivity.-Previous efforts to measure the electrical conductivity of Al 2 O 3 (l) are numerous, 21,[56][57][58][59][60][61][62][63] which is uncommon for refractory melts. Although recent researchers have compared their results with a partial selection of previous efforts, the last complete review of Al 2 O 3 (l) conductivity is that of Shpil'rain et al 60 More recent reviews, e.g., 67 have omitted without justification contributions from the aerodynamic levitation method.…”

“…A summary of previous measurements and the results of this assessment in the temperature range range T m (Al 2 O 3 ) = 2327 K 64,65 to T m (Ir) = 2719 K 65,66 are presented in Figure C1. Van Arkel et al 56 were the first to report the conductivity of Al 2 O 3 (l). Their estimate, 15 S cm −1 , was derived indirectly from the performance of an electric arc above Al 2 O 3 (l)…”

On the Mechanism of Microwave Flash Sintering of Ceramics

“…The high-temperature electric conductivity of the 5 at % Yb 3+ doped (La 0.1 Y 0.9 ) 2 O 3 composition is not known. However, it should be noted that the estimated values are slightly lower than the conductivity of pure Y 2 O 3 above the melting point, which equals 0.9 (Ω·cm) −1 [46]. …”