Tohoku University · 공학
이 교수의 연구실은 첨단 페로브스카이트 소재의 합성 및 전기적 특성 분석을 중심으로, 주로 바륨지르코네이트 기반의 수소 이온 도핑 소재와 비금속 포함물의 정밀 분석 기술 개발에 중점을 두고 있습니다. 특히, 수소 이온 전도도 향상을 위한 도핑 요소 선정과 미세구조 제어, 그리고 철강 산업에서의 비금속 포함물(예: BN, AlN, 스파이널 등)의 신속 정밀 분석을 위한 캐서모루미네센스(CL) 및 X선 유도 광발광(XEOL) 기반 분석 기술을 개발하고 있습니다. 연구는 실용적 현장 적용을 목표로 하며, 특히 포터블 분석 장비를 활용한 현장 실시간 분석 기술의 실현 가능성을 탐색하고 있습니다.
표시된 성과는 수집된 데이터 기준으로 산출되며, 일부 차이가 있을 수 있습니다.
The effects of various cations (, , , , , , , , , , and ) were examined as dopants into the B site of perovskite barium zirconate. The solubility of In, Yb, Tm, Er, and Ho, whose ionic radii are close to that of zirconium ion, into the B site is more than 0.075 at . In contrast, when there is a large difference of ionic radii between trivalent cations (, , , and ) and zirconium ion, the solubility of trivalent cations into barium zirconate is less than . The microstructure of sintered pellets an
Scandium and yttrium co-doped barium zirconate [ ] have been investigated in terms of phase relationship, microstructures, and electrical conductivity. The bulk conductivity of the scandium and yttrium co-doped barium zirconate increased with the dopant ratio of yttria. had the highest grain-boundary conductivity among the scandium and yttrium co-doped barium zirconates in this study. But, , , , and consisted of a single cubic perovskite phase at 1600°C and their densities of grain-boundary were
Typical microstructures of sintered for at were mixtures of larger and smaller grains. Well-grown and homogeneous grains of were observed by adding an extra amount of barium oxide from stoichiometric composition or extending the sintering time to . Such an extra amount of barium oxide is expected to decrease chemical stability in a wet atmosphere, and we observed the precipitation of yttria after sintering. However, we did not meet such difficulties in sintering . Large and uniform grains were o
Scanning electron microscope – cathodoluminescence (SEM ‐ CL) analysis was carried out for the rapid phase identification of a single particle with the size of approximately 100 µm consisting of alumina (Al 2 O 3 ) and spinel (MgAl 2 O 4 ) phases. We selected this particle as the analyte because Al 2 O 3 and MgAl 2 O 4 are typical inclusions in steel, and their identification is important for steel production. Samples were prepared by pressing a mixture of Al 2 O 3 and magnesia (MgO) powders hea
Identification of nitride inclusions such as boron nitride (BN) and aluminum nitride (AlN) is important in the steelmaking industry because BN inclusions deteriorate the creep strength of ferritic heat‐resistant steel, and AlN inclusions cause transverse cracking in twin‐induced‐plasticity steel. The conventional method employed for the analysis of such inclusions in steel comprises both optical microscopy and electron probe microanalysis (EPMA), which is the time‐consuming. The aim of this stud
Increasing oxygen permeation from oxide membranes can enable the development of next-generation power generation technologies with high efficiency and reduced CO2 mission. Here we introduce a new approach to design oxygen permeation membranes by covering the surfaces of pure oxygen-ion conductors with porous precious metal (Au and Ag) network or MIECs (LNO and LSCF). Oxygen permeation flux was enhanced by greatly by coating porous silver on the whole surface of pure oxygen ion-conducting membran
