Hidetoshi Miyazaki

Design of ITO/transparent resin optically selective transparent composite

Abstract Optically selective transparent composites were made using ITO particle mixed into a polymer resin. To fabricate the composites, ITO particles were chosen as filler, and Urethane resin (transparent resin) was chosen as a matrix. Using fine (30 nm ) and small ITO particle (10 μm ) , we obtained a composite with optically selective transparent properties. The best sample was 0.2 vol % of ITO fine particle (30 nm ) dispersed into the composite, it was not transparent in IR wavelength regions and transmitted more than 80% in visible wavelength region; so an optically selective transparent composite was successfully fabricated.

Residual stress in lead titanate thin film on different substrates

This paper describes the effect of thermal expansion coefficients of the substrates on the residual stress in lead titanate (PT) thin film. The residual stress in the film on the different substrates was calculated from the phonon mode shift. In addition, the dielectric constant for the film was calculated from the lattice mode frequency. As a result, the residual stress and the dielectric behavior depended upon the substrates.

Synthesis of CeO2 nanoparticles by rapid thermal decomposition using microwave heating

Abstract This article describes the synthesis of a CeO2 fine powder by thermal decomposition of cerium oxalate and cerium nitrate powders using a microwave furnace. Plate-like crystalline CeO2 particles were obtained using the cerium oxalate precursor powder. Using the cerium nitrate powder as a precursor, spherical crystalline CeO2 particles were obtained with a primary particle diameter of 30 nm and secondary particle size of 550 nm.

Thermochromic VO2-Nanocoated SiO2 Nanopowder Fabricated by Chemical Solution Deposition

VO2-nanocoated SiO2 (VOx–SiO2) particles were prepared by chemical solution deposition. The precursor VOx–SiO2 powder was prepared by coating vanadium 2-methoxyethanol alkoxide solution onto SiO2 nanoparticles. The VO2–SiO2 powder could be obtained easily by annealing the precursor powder at 200 °C for 1 h in air, without an inert or reduction atmosphere. The crystallinity of the precursor VO2–SiO2 powder was improved by heat treatment at 600 °C in Ar atmosphere. The resulting VO2–SiO2 powder showed a thermochromic property and a transition temperature of 68.4 °C.

Synthesis of Photochromic AgCl-Urethane Resin Composite Films

AgCl-resin photochromic composite films were prepared using AgNO3, HCl-EtOH, CuCl2 solution, and a liquid-state urethane resin as starting materials. The obtained composite films showed a photochromic property. The rate of darkening of the composite film increased after mixing with CuCl2. The AgCl particle size in the film without heat treatment was 6–20 nm, and that of the heat-treated film was 25–80 nm; these results were confirmed using TEM observations. The fading rate of the film without heat treatment was higher than that of the heat-treated films.

Piezoelectric and Fatigue Properties of Pb(Zr0.53Ti0.47)O3 Thin Films on LaNiO3 Thin Film Electrode

This paper describes the electrical properties of the CSD-derived ferroelectric PZT thin films on the oxide electrode of LaNiO 3 (LNO), which can improve the electrical fatigue for the PZT thin film. We successfully control the orientation of the resulting LNO thin film electrode by the molecular design of the precursor solution to control the orientation of the PZT thin film with a MPB composition on the LNO. As a result, PZT/LNO thin film capacitors exhibited superior electrical properties with no fatigue, not only for remanent polarization but also for piezoelectric and dielectric properties.

Grain Boundary Geometry of Superplastic Silicon Carbide Ceramic

Two kinds of silicon carbide ceramics were fabricated with Al 2 O 3 -Y 2 O 3 -CaO additives by hot-pressing using different SiC powders. The small pieces of these SiC were deformed by compression at 1650°C and 1700°C under constant cross-head speed, respectively. The specimen which was sintered with very fine powder (90nm) at 1750°C showed superplasticity, but the specimen sintered with less fine powder (280nm) at 1900°C did not. The microstructure of both the superplastic and the non-superplastic SiC ceramics was observed by transmission electron microscopy and scanning electron microscopy. After the deformation at 1650°C, liquid phase in the superplastic specimen redistributed and made large pockets. The orientation relation between adjacent two grains was observed by means of a microdiffraction techniquc. There was no significant difference in percentage of both coincidence site lattice boundary and low angle boundary between superplastic SiC and non-superplastic SiC.

Vanadium oxide-based photochromic composite film

V2O5-based composite films were fabricated using peroxo-iso-poly vanadic acid as the filler and transparent urethane resin as the matrix. The size of the V2O5 particles in the films was around 60–80 nm and the fabricated composite films exhibited photochromic properties when irradiated with ultraviolet (UV) light. The composite films displayed multichromism (yellow ↔ green ↔ pale blue) under UV irradiation. The absorption edge of the films shifted to lower wavelengths (Burstein Moss effect) with the increase of the coloring degree of the films. Almost all the colors of the composite film bleached when placed in a dark room.

Effects of Excess Cu Addition on Photochromic Properties of AgCl-Urethane Resin Composite Films

AgCl-resin photochromic composite films were prepared using AgNO3, HCl-EtOH, CuCl2 ethanol solutions, and a urethane resin as starting materials. The AgCl particle size in the composite films, which was confirmed via TEM observations, was 23–43 nm. The AgCl composite films showed photochromic properties: coloring induced by UV-vis irradiation and bleaching induced by cessation of UV-vis irradiation. The coloring and bleaching speed of the composite film increases with increasing CuCl2 mixing ratio.

Fabrication and Evaluation of Arrayed Needle-Like TiO2 Particle – Transparent Resin Composite Films

Needle-like TiO2-resin composite films were fabricated using needle-like TiO2 particle filler and urethane matrix. The needle-like TiO2 particles in the composite film were arrayed completely under the fabrication condition of applying AC bias of 10 volt with 0.1 Hz for 4 hr, and the transmittance of the resulting composite film showed angularly dependence. The needle-like TiO2 particles in the composite were oriented quickly by a larger applying bias. Furthermore, increase of the mixing ratio of TiO2 particles in the composite film caused increasing an angularly dependence of the transmittance of the composites.