Takehiko Hihara
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View article: Compositional tuning of NaAlI4: effects of Br⁻ substitution and excess Na+ on ionic conductivity
Compositional tuning of NaAlI4: effects of Br⁻ substitution and excess Na+ on ionic conductivity Open
Solid-state electrolytes are gaining attention as safer alternatives to conventional liquid electrolytes in lithium- and sodium-ion batteries, particularly for large-scale applications. Among them, sodium-based systems offer cost and resou…
View article: Experimental study on Na+ conductivity in NaAlBr4 and atomic-scale investigation of Na+ conduction
Experimental study on Na+ conductivity in NaAlBr4 and atomic-scale investigation of Na+ conduction Open
The ionic conduction properties of Li/Na metal halides have been extensively studied, with recent attention turning towards Al-based systems. However, limited studies have focused on alkali Al bromides. In this study, we explored the Na + …
View article: Tenfold Enhancement of Wear Resistance by Electrosynthesis of a Nanostructured Self‐Lubricating Al<sub>2</sub>O<sub>3</sub>/Sn(S)MoS<sub>2</sub> Composite Film on AlSiCu Casting Alloys
Tenfold Enhancement of Wear Resistance by Electrosynthesis of a Nanostructured Self‐Lubricating Al<sub>2</sub>O<sub>3</sub>/Sn(S)MoS<sub>2</sub> Composite Film on AlSiCu Casting Alloys Open
Enhancing tribological performance through nanostructure control is crucial for saving energy and improving wear resistance for diverse applications. We introduce a new electrochemical approach that integrates aluminum (Al) anodization, ti…
View article: Magnetic and transport properties of chiral antiferromagnetic Co2−<i>x</i>Pd<i>x</i>Mo3N thin films
Magnetic and transport properties of chiral antiferromagnetic Co2−<i>x</i>Pd<i>x</i>Mo3N thin films Open
Hall transport and non-collinear magnetoresistance (NCMR) are studied for a chiral antiferromagnet (AFM) with the filled β-Mn-type structure. Magnetic and transport properties of epitaxial thin films of Co2−xPdxMo3N revealed that, in addit…
View article: Relation between Electronic Structure and Thermoelectric Properties of Heusler-Type Ru2VAl Compounds
Relation between Electronic Structure and Thermoelectric Properties of Heusler-Type Ru2VAl Compounds Open
We investigated Heusler-type Ru2VAl, a candidate material for next-generation thermoelectric conversion, by first-principle calculations of its thermoelectric conversion properties and direct experimental observations of its electronic str…
View article: Ionic Conductivity of Ca<sup>2+</sup> Doped NaI–LiI Solid Electrolyte and Its Stability with Li Metal
Ionic Conductivity of Ca<sup>2+</sup> Doped NaI–LiI Solid Electrolyte and Its Stability with Li Metal Open
The effects of Ca2+ doping on the ionic conductivity and the stability with a Li of NaI–LiI solid electrolyte were investigated. Evidence of the Ca2+ doping was found in a Rietveld analysis of the synchrotron X-ray diffraction pattern. The…
View article: Fabrication and Electrochemical Performance of TiO<sub>2</sub>–TiN/Sn–SnO<sub>2</sub> Composite Films on Ti for LIB Anodes with High Capacity and Excellent Conductivity
Fabrication and Electrochemical Performance of TiO<sub>2</sub>–TiN/Sn–SnO<sub>2</sub> Composite Films on Ti for LIB Anodes with High Capacity and Excellent Conductivity Open
According to the requirements for anode materials of safe and high‐capacity lithium‐ion batteries (LIBs), various Sn/TiO 2 and SnO 2 /TiO 2 composite materials have been developed, but no reports have yet combined them by a simple fabricat…
View article: Tailoring of Morphology and Crystalline Structure of Nanoporous TiO<sub>2</sub>–TiO–TiN Composite Films for Enhanced Capacity as Anode Materials of Lithium-Ion Batteries
Tailoring of Morphology and Crystalline Structure of Nanoporous TiO<sub>2</sub>–TiO–TiN Composite Films for Enhanced Capacity as Anode Materials of Lithium-Ion Batteries Open
We report a novel three-dimensional nanoporous TiO2–TiO–TiN (Np-TTT) ternary composite film with cylindrical pores of diameter ϕ30–50 nm and laminated tier thickness of 10–30 nm, which was fabricated straightforwardly on a Ti foil via a on…
View article: Electric and Magnetic Evolution in Sputter-Deposited Fe<sub><i>x</i></sub>Si<sub>1−<i>x</i></sub> Alloy Films
Electric and Magnetic Evolution in Sputter-Deposited Fe<sub><i>x</i></sub>Si<sub>1−<i>x</i></sub> Alloy Films Open
FexSi1−x alloy films have been prepared by an rf sputter-deposition method. X-ray diffraction patterns indicate that an amorphous phase is formed for x < 0.8. Temperature dependence of electrical resistivity indicates the following electri…
View article: Electric Evolution in Sputter-Deposited Sn<sub><i>c</i><sub>Sn</sub></sub>Si<sub>1−<i>c</i><sub>Sn</sub></sub> Alloy Films
Electric Evolution in Sputter-Deposited Sn<sub><i>c</i><sub>Sn</sub></sub>Si<sub>1−<i>c</i><sub>Sn</sub></sub> Alloy Films Open
SncSnSi1−cSn alloy films (cSn : the chemical composition) have been prepared by rf sputter-deposition. X-ray diffraction measurement indicate that almost pure bct Sn and amorphous Si phases coexist for 0.28 ≤ cSn < 1.0. The electrical resi…
View article: Electric and Magnetic Evolutions in Composite Assemblies of Fe and Si Nano-Particles
Electric and Magnetic Evolutions in Composite Assemblies of Fe and Si Nano-Particles Open
Temperature (T)-dependence of electrical resistivity (ρ) and magnetization curves have been observed for Fe and Si nano-particle (NP) composite assemblies prepared using a double-source-plasma-gas-condensation cluster deposition system. Wi…