Crystal Structures and Conduction Paths of Sc-Doped CaTiO Fast Oxide-Ion Conductors with Orthorhombic Symmetry.

The crystal structures and electron density distributions (EDDs) of Ca-deficient Sc-doped CaTiO fast oxide-ion conductors, Ca(TiSc)O (CTS3) and Ca(TiSc)O (CTS10), were investigated in the temperature range of 298-1173 K in N to analyze the effect of composition on the perovskite structure and oxide-ion transport mechanism. CTS3 and CTS10 exhibited orthorhombic symmetry in temperature ranges of 298-1173 K and 973-1173 K, respectively, with CTS10 exhibiting lower symmetry and reduction in oxide-ion conductivity below 973 K. The EDDs of CTS3 and CTS10 at 1173 K indicated unique chemical bonds and conduction paths.

Massive red shift of Ce in YAlO incorporating super-high content of Ce.

In light emitting diodes, YAlO:Ce (YAG:Ce) is used as a yellow phosphor in combination with blue LEDs but lacks a red component in emission. Therefore, considerable efforts have been directed toward shifting the emission of YAG:Ce to longer wavelengths. In this study, a YAlO (YAG) crystal incorporating a high content of Ce, (Y Ce )AlO (0.

Nanocomposite electrodes for high current density over 3 A cm in solid oxide electrolysis cells.

Solid oxide electrolysis cells can theoretically achieve high energy-conversion efficiency, but current density must be further increased to improve the hydrogen production rate, which is essential to realize widespread application. Here, we report a structure technology for solid oxide electrolysis cells to achieve a current density higher than 3 A cm, which exceeds that of state-of-the-art electrolyzers. Bimodal-structured nanocomposite oxygen electrodes are developed where nanometer-scale SmSrCoO and CeSmO are highly dispersed and where submicrometer-scale particles form conductive networks with broad pore channels.

Unusually Small Thermal Expansion of Ordered Perovskite Oxide CaCu₃Ru₄O with High Conductivity.

We measured the coefficient of thermal expansion (CTE) of conducting composite ceramics 30 vol.% CuO-mixed CaCu₃Ru₄O together with CaCu₃Ru₄O and CuO. Although conducting ceramics tend to show higher CTE values than insulators, and its CTE value does not match with other ceramic materials, the CTE of CaCu₃Ru₄O (7⁻9 × 10/K) was as small as those of insulators such as CuO (9 × 10/K), alumina (8 × 10/K), and other insulating perovskite oxides.

Remarkable response of juvenile diffuse sclerosing osteomyelitis of mandible to pamidronate.

We report a juvenile case of diffuse sclerosing osteomyelitis of the mandible that showed a favorable response to pamidronate, a bisphosphonate derivative. Although conventional treatments had been ineffective for 5 years, pamidronate administration brought about conspicuous improvement both clinically and radiographically. Severe adverse reaction was not found except for low-grade fever and lassitude on the day following administration.