Kazuhiro S. Goto

Permeability, diffusivity, and solubility of oxygen gas in liquid slag

An experimental procedure for measurement of the permeability of dissolved oxygen gas in liquid slag has been developed using an oxygen concentration cell. The small amount of oxygen gas which penetrated through the liquid oxide from a pure oxygen compartment to a pure argon compartment was determined by the galvanic cell. The permeabilities of oxygen through liquid PbO-SiO2 and FeO-PbO-SiO2 were found to be in the range 3 x 10-8 to 3 x 1O-7 moles/cm s. The permeabilities were little influenced by temperature but more influenced by the composition. In separate experiments, the oxygen pressure change at the bottom of a column of slag was detected by another galvanic cell. By this method, it is not necessary to quench the specimen to determine the concentration profile of dissolved oxygen and to determine its diffusivity. Liquid oxides in the PbO-SiO2, CaO-SiO2-Al2O3and FeO-PbO-SiO2 systems were studied. The oxygen diffusion coefficients (5 x 10-5 to 3 x 10-3 cm2/s) were found to increase with temperature for a fixed composition of slag, and with an increase of network-modifier oxide content at constant temperature. The solubility of oxygen gas in PbO-SiO2 melts was estimated to be 2 x 10-4 to 2 x 10-5 moles/cm3 from the determined diffusivities and permeabilities. The solubilities decreased with increasing temperature in the composition range studied. Physical solubilities of gases and metals in slags determined by other investigators are compared with the present results.

Degradation of electrochromic amorphous WO sub 3 film in lithium-salt electrolyte

The electrochromic behavior of amorphous WO{sub 3} films prepared by electron-beam deposition has been studied. SIMS analysis has revealed the lithium accumulates in amorphous WO{sub 3} films during reversible coloring and bleaching in propylene carbonate solution of LiClO{sub 4}. When a large quantity of lithium has been injected into WO{sub 3} films, an absorption spectrum different from tungsten bronze is observed. In these films, lithium tungstate has been observed using x-ray photoelectron spectroscopy and x-ray diffraction analysis. It has been concluded that the degradation of electrochromism of amorphous WO{sub 3} is caused by the formation of stable lithium tungstate.

Ionic conductivity of solid calcium sulfide at 650 to 1000° C

The electrical conductivity of solid calcium sulfide has been measured at various temperatures and sulfur pressures with the aid of an alternating current bridge. At partial pressures less than about 10−6 atm at 770°C to 1000°C, the conductivity is independent of sulfur pressure and can be expressed by log10 σ (Ω−1 ·cm−1) = −5.185/T(K) − 0.0901 The apparent activation energy for the conduction is 23.7 (± 1.04) kilocalories per mole. Both the relatively large activation energy and the lack of dependence of the specific conductivity on sulfur pressure suggest that the conduction is predominantly ionic for sulfur pressures less than about 10−6 atm. However, for pressures greater than 10−6 atm, the specific conductivity increases with an increase of the sulfur pressure, suggesting positive hole conduction. Some comments are included on the possibility of the application of calcium sulfide as a solid electrolyte of a sulfur concentration cell.

Interdiffusivities matrix of CaO-AI2O3-SiO2 melt at 1723 k to 1823 k

AbstractTernary oxide mixtures of lime, alumina, and silica were premelted and quenched to produce glassy cylinders. A diffusion couple was selected from the mixtures of six different compositions in such a way that the average composition could be 40 wt pct CaO-20 wt pct A12O3 = 40 wt pct SiO2. Penetration curves of the components were measured with a X-ray microprobe analyzer.The interdiffusivities matrix defined with the Matano interface has been obtained from 52 successful diffusion runs at 1723 K to 1823 K as follows;1 % MathType!MTEF!2!1!+-% feaafiart1ev1aaatCvAUfKttLearuqr1ngBPrgarmWu51MyVXgatC% vAUfeBSjuyZL2yd9gzLbvyNv2CaeHbd9wDYLwzYbItLDharyavP1wz% ZbItLDhis9wBH5garqqtubsr4rNCHbGeaGqiVy0df9qqqrpepC0xbb% L8F4rqqrFfpeea0xe9Lq-Jc9vqaqpepm0xbba9pwe9Q8fs0-yqaqpe% pae9pg0FirpepeKkFr0xfr-xfr-xb9adbaqaaeGaciGaaiaabeqaam% aaeaqbaaGceaqabeaacuWGebargaacamaaDaaaleaaiqaacaWFXaGa% a8hmaiaa-1cacaWFXaGaa8hmaaqaaiaa-ndacaWFWaaaaOGaeyypa0% Jaa8hoaiaa-5cacaWF5aGaa8hiaiabgEna0kaa-bcacaWFXaGaa8hm% amaaCaaaleqabaGaa8xlaiaa-fdacaWFXaaaaOGagiyzauMaeiiEaG% NaeiiCaaNaeiikaGIaeyOeI0YaaSaaaeaacaWFYaGaa8xnaiaa-nda% caWFSaGaa83naiaa-bdacaWFWaaabaaceiGaa4Nuaiaa+rfaaaGaei% ykaKIaeiikaGIaa8xBamaaCaaaleqabaGaa8Nmaaaakiabc+caViaa% -nhacqGGPaqkaeaacuWGebargaacamaaDaaaleaacaWFXaGaa8hmai% aa-1cacaWFYaGaa8hmaaqaaiaa-ndacaWFWaaaaOGaeyypa0JaeyOe% I0Iaa8Nmaiaa-5cacaWF1aGaa8hiaiabgEna0kaa-bcacaWFXaGaa8% hmamaaCaaaleqabaGaa8xlaiaa-fdacaWFXaaaaOGagiyzauMaeiiE% aGNaeiiCaaNaeiikaGIaeyOeI0YaaSaaaeaacaWFXaGaa8xoaiaa-r% dacaWFSaGaa83maiaa-bdacaWFWaaabaGaa4Nuaiaa+rfaaaGaeiyk% aKIaeiikaGIaa8xBamaaCaaaleqabaGaa8Nmaaaakiabc+caViaa-n% hacqGGPaqkaaaa!818E!

The interdiffusivity matrix of Fe2O3-CaO-SiO2 melt at 1693 to 1773 K

\begin{gathered} \tilde D_{10 - 10}^{30} = 8.9 \times 10^{ - 11} \exp ( - \frac{{253,700}}{{RT}})(m^2 /s) \hfill \\ \tilde D_{10 - 20}^{30} = - 2.5 \times 10^{ - 11} \exp ( - \frac{{194,300}}{{RT}})(m^2 /s) \hfill \\ \end{gathered}

Velocity and absorption coefficient of ultrasonic waves in molten and glassy silicates and borates

2 % MathType!MTEF!2!1!+-% feaafiart1ev1aaatCvAUfKttLearuqr1ngBPrgarmWu51MyVXgatC% vAUfeBSjuyZL2yd9gzLbvyNv2CaeHbd9wDYLwzYbItLDharyavP1wz% ZbItLDhis9wBH5garqqtubsr4rNCHbGeaGqiVy0df9qqqrpepC0xbb% L8F4rqqrFfpeea0xe9Lq-Jc9vqaqpepm0xbba9pwe9Q8fs0-yqaqpe% pae9pg0FirpepeKkFr0xfr-xfr-xb9adbaqaaeGaciGaaiaabeqaam% aaeaqbaaGceaqabeaacuWGebargaacamaaDaaaleaaiqaacaWFYaGa% a8hmaiaa-1cacaWFXaGaa8hmaaqaaiaa-ndacaWFWaaaaOGaeyypa0% JaeyOeI0Iaa8hnaiaa-5cacaWFWaGaa8hiaiabgEna0kaa-bcacaWF% XaGaa8hmamaaCaaaleqabaGaa8xlaiaa-fdacaWFXaaaaOGagiyzau% MaeiiEaGNaeiiCaaNaeiikaGIaeyOeI0YaaSaaaeaacaWFXaGaa83n% aiaa-DdacaWFSaGaa8Nnaiaa-bdacaWFWaaabaaceiGaa4Nuaiaa+r% faaaGaeiykaKIaeiikaGIaa8xBamaaCaaaleqabaGaa8Nmaaaakiab% c+caViaa-nhacqGGPaqkaeaacuWGebargaacamaaDaaaleaacaWFYa% Gaa8hmaiaa-1cacaWFYaGaa8hmaaqaaiaa-ndacaWFWaaaaOGaeyyp% a0Jaa8Nnaiaa-5cacaWFXaGaa8Nmaiaa-bcacqGHxdaTcaWFGaGaa8% xmaiaa-bdadaahaaWcbeqaaiaa-1cacaWFXaGaa8xmaaaakiGbcwga% LjabcIha4jabcchaWjabcIcaOiabgkHiTmaalaaabaGaa83maiaa-f% dacaWF4aGaa8hlaiaa-rdacaWFWaGaa8hmaaqaaiaa+jfacaGFubaa% aiabcMcaPiabcIcaOiaa-1gadaahaaWcbeqaaiaa-jdaaaGccqGGVa% WlcaWFZbGaeiykaKcaaaa!8239!

Kinetics of the solid state reaction between zinc oxide and aluminum oxide

\begin{gathered} \tilde D_{20 - 10}^{30} = - 4.0 \times 10^{ - 11} \exp ( - \frac{{177,600}}{{RT}})(m^2 /s) \hfill \\ \tilde D_{20 - 20}^{30} = 6.12 \times 10^{ - 11} \exp ( - \frac{{318,400}}{{RT}})(m^2 /s) \hfill \\ \end{gathered}