Synthesis and Ion-Transport Properties of EuKGeO-, CaFeGeO-, and BaCuGeO-Type Oxide-Ion Conductors.

EuKGeO-, CaFeGeO-, and BaCuGeO-type germanates are synthesized by a conventional solid-state method and characterized to reveal their oxide-ion-conducting properties. Materials of the EuKGeO group exhibit oxide-ion conductivity (e.g.

Phosphorescent Material Search Using a Combination of High-Throughput Evaluation and Machine Learning.

High-throughput experiments including combinatorial chemistry are useful for generating large amounts of data within a short period of time. Machine learning can be used to predict the regularity of a response variable using a statistical model of a data set. Because a combination of these methods can accelerate the material development, we applied such a combination to a search of semiconducting thin films prepared on an Eu and Dy codoped SrAlO-based phosphorescent material to improve the lifetime of its afterglow.

Development of a High-Throughput Screening Method for Oxide-Ion Conductors and Its Application to Bismuth-Based Oxide Library Thin Films.

To accelerate material discovery, we develop a screening method for oxide-ion conductors that comprises combinatorial synthesis using chemical-solution deposition and high-throughput measurements using X-ray diffraction and conductivity. The present method allows us to form an arbitrary and uniform composition within an evaluation area at an arbitrary position in the library on a substrate. This screening method is applied to ABiZr (NbTa )O bismuth-layered compounds, which are known to have relatively high oxide-ion conductivities but are yet to be examined thoroughly.

Improving Powder Magnetic Core Properties via Application of Thin, Insulating Silica-Nanosheet Layers on Iron Powder Particles.

A thin, insulating layer with high electrical resistivity is vital to achieving high performance of powder magnetic cores. Using layer-by-layer deposition of silica nanosheets or colloidal silica over insulating layers composed of strontium phosphate and boron oxide, we succeeded in fabricating insulating layers with high electrical resistivity on iron powder particles, which were subsequently used to prepare toroidal cores. The compact density of these cores decreased after coating with colloidal silica due to the substantial increase in the volume, causing the magnetic flux density to deteriorate.

Selective CO2 conversion to formate in water using a CZTS photocathode modified with a ruthenium complex polymer.

Highly selective photoelectrochemical CO(2) reduction (>80% selectivity) in water was successfully achieved by combining Cu(2)ZnSnS(4) (CZTS) with a metal-complex electrocatalyst. CZTS, a sulfide semiconductor that possesses a narrow band gap and consists of earth-abundant elements, is demonstrated to be a candidate photoabsorber for a CO(2) reduction hybrid photocatalyst.

Transmission electron microscopy on thin film of high density magnetic composite prepared by FIB method.

A thin specimen of a high density magnetic composite (HDMC), which is a type of powder magnetic cores was prepared for transmission electron microscopy (TEM) using a focused ion beam (FIB) method. A homogeneous thin film containing an insulator boundary between the constituent Fe powders was obtained successfully. Using this thin film, detailed flow of magnetic flux was visualized by electron holography, and the magnetic flux density was estimated to be 1.