The Ceramic Society of JapanActa Medica Okayama1882-0743128102020Crystal structure of Ca(Fe0.4Si0.6)O2.8 oxygen-deficient perovskite843846ENMasamiKanzakiInstitute for Planetary Materials, Okayama UniversityThe crystal structure of Ca(Fe3+0.4Si0.6)O2.8 oxygen-deficient perovskite phase synthesized at 12 GPa and 1400 C was studied using synchrotron powder X-ray diffraction. The phase is isostructural to low-pressure phase of Ca(Al0.4Si0.6)O2.8. The structure was refined by the Rietveld method and is consists of a perovskite-like triple-layer of corner-shared (Fe3+,Si)O6 octahedra and a double-layer of SiO4 tetrahedra those are stacked alternatively in the [111] direction of ideal cubic perovskite. Small degree of Fe3+/Si disorder was detected between two octahedral sites. The structure is compared with other oxygen-deficient perovskites.No potential conflict of interest relevant to this article was reported.The Ceramic Society of JapanActa Medica Okayama1882-074311713642009The preparation and characterization of TiO2/ZrO2 composites doped with PMA/PWA411414ENThanganathanUmaMasayukiNogamiA new class of glass composite membranes of various compositions was prepared via a sol-gel technique. The membranes, consisting of (phophotungsticacid/phosphomolybdicacid) PWA/PMA-P2O5-SiO2 mixed with either ZrO2 or TiO2 displayed varying properties depending on their composition and mode of fabrication. The structure and property of the obtained glass ceramic composite membranes were investigated by FTIR, TG/DTA and textural analysis. The results included good mechanical, textural and thermal properties and the materials were deemed to be suitable electrolytes for fuel cell applications.No potential conflict of interest relevant to this article was reported.The Ceramic Society of JapanActa Medica Okayama0914-540011313132005Consideration on the Correlation between Basicity of Oxide Glasses and O1s Chemical Shift in XPS4450ENTokuroNanbaYoshinariMiuraShinichiSakidaO1s binding energy measured by X-ray photoelectron spectroscopy (XPS) is candidate as a new tool to determine a new scale of Lewis basicity of oxide ions in glass. Some mathematical expressions for the basicity or XPS chemical shift, such as charge parameter and optical basicity, were compared with the experimental O1s binding energy in binary alkali oxide glasses. The expressions so far in use needed some modification in parameters. A new empirical expression introduced in this paper gives a new concept and universal scale of basicity.No potential conflict of interest relevant to this article was reported.The Ceramic Society of JapanActa Medica Okayama1882-074311613502008Chemical recycling of inorganic wastes by using phase separation of glass220223ENTokuroNanbaShuheiMikamiTakuyaImaokaShinichiSakidaYoshinariMiuraA chemical recycling process using phase separation of glass was applied to a granulated blast furnace slag with high CaO content. Glasses were prepared by adding B(2)O(3) to the slag in order to promote phase separation, and the glasses were heat-treated above glass transition temperature. In the subsequent acid-treatment, however, gelation due to the elution of SiO(2) phase containing CaO occurred, not obtaining high SiO(2) solids. Then, pretreatment was introduced to reduce CaO content in slag, where the raw slag was briefly washed in acid. The slag glasses prepared from the pretreated slag were commonly phase-separated by heat-treatment regardless of B(2)O(3) content. After subsequent acid-treatment, colorless insoluble solids were successfully recovered. The end products consist of 70-90 mass% SiO(2), and coloring ions such as Mn, Fe and Cr were almost completely removed from the slag glasses. Reutilization as raw materials for glass is expected.No potential conflict of interest relevant to this article was reported.The Ceramic Society of JapanActa Medica Okayama1882-074311713712009Chemical recycling of municipal waste slag by using phase separation11951198ENTokuroNanbaYutaroKurodaShinichiSakidaYasuhikoBeninoA chemical recycling method by using phase separation was applied to municipal waste slags. Glasses were prepared from incineration ash and ash-melted slag, where B(2)O(3) was added to promote phase separation. The glasses were heat-treated at temperatures higher than their glass transition temperatures, and they were soaked in hydrochloric acid, leaching CaO, Fe(2)O(3), K(2)O, and S. Transparent and colorless solids containing ca. 80 mass% of SiO(2) were successfully obtained as residues. It was suggested that phase separation took place not in the heat-treatment but in the vitrification process, and further characterizations are however required to investigate the phenomena at microscopic levels in the recycling processes.No potential conflict of interest relevant to this article was reported.The Ceramic Society of JapanActa Medica Okayama1882-074311813792010Phase separation of borosilicate glass containing sulfur603607ENKeijiSaikiShinichiSakidaYasuhikoBeninoTokuroNanbaA 10Na(2)S·30B(2)O(3)·60SiO(2) (mol %) glass was prepared, and the changes in glass structure and chemical state of sulfur caused by phase separation were investigated. In the as-prepared and heat-treated glasses, sulfur was present as S(2)| anion and polysulfide S(2)| and S(3)| anions, and Si–S and B–S bonds were not confirmed. A phase separation by spinodal decomposition was observed after heat-treatment, where sulfur was preferentially distributed to borate-rich phase. Even after the phase separation, formation of non-bridging oxygen was not recognized. The preferential distribution of sulfur anions in the present glass was explainable on the basis of the change in population of sodium ions, which compensated the negatively-charged sulfur anions.No potential conflict of interest relevant to this article was reported.