The effect of the structural environment on the Cl− ion conductivity was demonstrated in LaOCl‐based solid electrolytes. By replacing the La3+ site with lower‐valent Mg2+ or Ca2+ ions, the conductivity was enhanced owing to the formation of a Cl− ion vacancy. Despite the same dopant content, the conductivity of La0.8Ca0.2OCl0.8 was considerably greater than La0.8Mg0.2OCl0.8. This enhancement of the conductivity was influenced by the high ionicity of the Cl− ions, which facilitated the weakening of the La‐Cl bond cleavage to conduct inside the lattice. The elongation of the La‐La distance, associated with the Cl− ion conduction, could also cause an increase of the conductivity.

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A Pt/CeO 2-ZrO 2-Bi 2 O 3 /SBA-16 catalyst was prepared to realize highly selective oxidation of glycerol to produce dihydroxyacetone (DHA). An active oxygen supply from the CeO 2-ZrO 2-Bi 2 O 3 promoter effectively oxidized glycerol to produce DHA under moderate conditions (i.e. at 30°C without applied pressure). After a 4 h catalytic reaction using the Pt/CeO 2-ZrO 2-Bi 2 O 3 / SBA-16 catalyst, the DHA yield and selectivity rose to 76% and 84%, respectively.

Compounds of LiGa 1−x Al x GeO 4 with 0 ≤ x ≤ 1 were examined using powder X-ray diffraction measurements and electrochemical impedance spectroscopy, to clarify their structures and Li-ion conductivity (σ Li ) as a function of x, and to compare with those for a wide variety of AB 2 O 4 -type oxides. The x = 0 and 0.25 samples were found to exhibit a phenacite structure with R 3 space group, whereas the x ≥ 0.5 samples were found to exhibit an ordered phenacite structure with R3 space group due to the 1:1 cation order between Ga 3+ /Al 3+ and Ge 4+ ions. The σ Li value for the x = 0 sample was 2.81(1) × 10 −5 S•cm −1 at 973 K. Owing to the 1:1 cation order, both σ Li and activation energy (E a ) were slightly improved at x = 1. The structural details of LiGa 1−x Al x GeO 4 , possible conduction pathway of Li + ions, and correlation between crystal structure and σ Li (E a ) are presented.

The Sc3+ ion migration in the scandium tungstate solid was qualitatively demonstrated. For clarifying the exact migrant quantitatively, modified Tubandt electrolysis was performed for the Sc2(WO4)3 solid. As a result of the strict compensation, that is, vaporization and adherence compensations, a weight increase at the cathodic side and a weight decrease at the anodic side were reproducibly observed after the electrolysis. In addition, the Sc concentration at the cathodic side was increased and a corresponding decrease at the anodic side was observed. Therefore, the Sc3+ ion conduction in the Sc2(WO4)3 solid was quantitatively demonstrated.