The internal luminescence quantum efficiency and color properties of AVO3 (A: Li, Na, K, Rb, Cs), M2V2O7 (M: Mg, Ca, Sr, Ba, Zn), M3V2O8 Zn) have been investigated. These vanadate phosphors exhibited broadband emission from 400 nm to over 800 due the one-electron charge transfer transition in VO4 tetrahedra, luminescent materials ranged green yellow-orange via white, corresponding 0.277 < x 0.494 0.389 y 0.488 on CIE chromaticity diagram. We found that with tetrahedra was strongly enhanced...

Undoped cuprates have long been considered to be antiferromagnetic insulators. In this article, however, we report that superconductivity is achieved in undoped T'-RE2CuO4 (RE = Pr, Nd, Sm, Eu, and Gd). Our discovery was performed by using metal-organic decomposition (MOD), an inexpensive easy-to-implement thin-film process. The keys prepare the superconducting films are firing with low partial-pressure of oxygen reduction at temperatures. highest Tc over 30 K, substantially higher than...

We report an up-to-4-fold enhancement in the in-magnetic-field critical current density at 77 K of epitaxial YBa2Cu3O7 films on CeO2-buffered SrTiO3 substrates by 3-MeV Au2+ irradiation. This indicates that irradiation using industrially practical ion beam, which generally has kinetic energy less than 5 MeV, can provide a substantial increase in-field performance high-temperature superconductor films. Transmission electron microscopy results show point-like defects smaller 6 nm diameter were created

The magnetic-field angle dependence of the critical current density Jc(H, θ) was measured in Y Ba2Cu3O7 − δ (YBCO) thin films with strong flux pinning (Jc ≥ 2.5 MA cm 2 at 77.3 K) prepared by a fluorine-free (FF) metal organic deposition (MOD) method and thermal co-evaporation. Steep Jc(θ) peaks around were observed FF-MOD films, anisotropic scaling analysis showed that is mainly due to small random (point) pins ab-plane-correlated pins. Few precipitates diameter less than 10 nm transmission...

The effects of temperature and atmosphere on the BYCO formation reaction BaCO 3 , Y 2 O CuO, prepared by pyrolysis metal acetylacetonate solution, were examined TG-DTA, XRD resistivity measurement. This was found to proceed readily below 900°C under low oxygen partial pressures. Superconducting Ba YCu 7- y films with T c,zero \cong90 K J c (77 K)=300–400 A/cm dipping-pyrolysis process using above solution through heat treatments at 820°–880°C controlled pressures ρ(O )=1×10 -3 –2×10 -4 atm...

Epitaxial VO2 films were prepared on the C-planes of α-Al2O3 substrates by a metal organic deposition (MOD) process. It was difficult to obtain single phase (010)M-oriented films, in which subscript M refers monoclinic indices, heat treatment amorphous precursor VO2-stable region after pyrolysis coating solution. The product consisted discontinuous circular grains 1–2 µm size substrate surface. Therefore, we epitaxial using postepitaxial topotaxy (PET), that is, topotactic oxidation...

In order to assess the benefits of superior rooting ability rice (Oryza sativa L.) for growth after transplanting under water-limiting conditions, genetic differences in seedlings 30 d sowing, with their visible roots either pruned or not pruned, were quantified by several root parameters 4 (DAT), flooded non-flooded paddy fields (four treatments total), together production traits at maturity. Ninety-eight recombinant inbred lines from two japonica ecotypes, a lowland variety Otomemochi, and...

La 0.7 Ca 0.3 MnO 3 (LCMO) thin films have been prepared on LaAlO3 and SrTiO3 (STO) (001) single-crystal substrates by the metal-organic deposition process. These were characterized transmission electron microscopy (TEM) temperature dependence of resistance R(T). The microstructure LCMO LCMO/substrate interfaces investigated through cross-sectional TEM observations. High-resolution (HRTEM) observations electron-diffraction patterns demonstrate epitaxial growth both LAO STO substrates. local...

An up-to-11-fold enhancement was observed in the in-magnetic-field critical current density (Jc) epitaxial YBa2Cu3O7 films on CeO2-buffered SrTiO3 substrates by irradiation with 200- to 750-keV Si and 200-keV B ions. This indicates that ion beams range of 100 1000 keV, which are widely used for modifying conductive properties semiconducting materials, can significantly improve vortex-pinning second-generation superconducting wires. Also a scaling relation between Jc vacancies (i.e., Frenkel...

TiO 2 (rutile) films have been successfully prepared by the coating photolysis process using ArF excimer laser irradiation at room temperature. The choice of Ti-alkoxide type as starting material and effects atmosphere on product studied Fourier transformation infrared (FT-IR) X-ray diffraction (XRD). When Ti(O-i-C 3 H 7 ) 4 material, rutile were obtained in a dry N atmosphere, whereas amorphous air. Ti(OCH CH(C 5 )-n-C 9 even air atmosphere. Crystallization mechanism is also discussed.

Epitaxially grown Pb(Zr, Ti)O 3 (PZT, Pb:Zr:Ti=1:0.52:0.48) thin films were prepared on Nb-doped SrTiO (100) substrates by dipping-pyrolysis process with metal naphthenates used as starting materials. The alignments of the investigated based X-ray diffraction (XRD) θ–2θ scans, β scans (pole figures), and asymmetric ω–2θ (reciprocal-space maps). Epitaxial smooth surfaces obtained heat treatment prefired at 600°–750° C; a film heat-treated 750° C showed strongest peak intensities in XRD scans....