Nagoya Institute of Technology

About: Nagoya Institute of Technology is a education organization based out in Nagoya, Japan. It is known for research contribution in the topics: Thin film & Catalysis. The organization has 10766 authors who have published 19140 publications receiving 255696 citations. The organization is also known as: Nagoya Kōgyō Daigaku & Nitech.

Rare Earth Doped Zinc Oxide Nanophosphor Powder: A Future Material for Solid State Lighting and Solar Cells

Abstract: A comprehensive review of up-conversion (UP) and down-conversion (DC) or down shifting of rare earth (RE) doped zinc oxide (ZnO) nanophosphors is presented. Research interest in the development of RE3+ doped ZnO for UP and DC nanophosphors has been encouraged by the potential application of these materials in light emitting diodes and different types of photovoltaic cells. A range of remarkable characteristics, which are organized into different sections describing the structure, optical, and luminescence properties of these materials, are discussed in detail. Undoped ZnO has two characteristic emissions in the ultraviolet and visible regions related, respectively, to excitonic recombination and intrinsic defects. X-ray photoelectron spectroscopy (XPS) data demonstrated a correlation between the visible emission and intrinsic defects. In the case of the DC or shifting process, there was simultaneous emissions related to f → f transitions of RE ions and defects in ZnO host. These emissions were dependent o...

Effects of TiO2 on sinterability and dielectric properties of high-Q forsterite ceramics

Abstract: High- Q plain forsterite ceramics with Q · f =240,000 GHz were developed by the usual solid sintering process using raw materials of highly purified MgO and SiO 2 . The τ f (temperature coefficient of the resonant frequency) was negative in range −60 to −70ppm/°C. To adjust this to zero we added rutile with high τ f (450ppm/°C). The addition of TiO 2 increased dielectric constant ( e r ), did not affect the Q value, but decreased the sintering temperature by about 100 °C for addition of 0.5 to 10 wt.% TiO 2 . These results were attributed to increasing the sinterability at low temperature by the TiO 2 and the almost pore-free and glassy-phase free grain boundary microstructures. It was not possible to develop a compostion which had τ f =0 ppm/°C, as a result of the chemical reaction between MgO–TiO 2 and TiO 2 during sintering.

JCPDS--International Centre for Diffraction Data round robin study of silver behenate. A possible low-angle X-ray diffraction calibration standard

Abstract: A task group of the JCPDS—International Center for Diffraction Data (ICDD) was established with the charge of investigating the use of silver behenate, CH 3 (CH 2 ) 20 COO·Ag, as a possible low-angle calibration standard for powder diffraction applications. Utilizing several data collection and analysis techniques, long-period spacing ( d 001 ) values with a range of 58.219–58.480 A were obtained. Using the same collected data and one data analysis refinement calculation method resulted in dm values with a range of 58.303–58.425 A. Data collected using a silicon internal standard and the same singular data analysis calculation method provided d 001 values with a range of 58.363–58.381 A.

Science of tungstenbronze-type like Ba6–3xR8+2xTi18O54 (R=rare earth) microwave dielectric solid solutions

Abstract: The crystallography of tungstenbronze-type like Ba6−3xR8+2xTi18O54 solid solutions for microwave dielectric materials applied for mobile phone and base station were studied. The crystal data and crystal structure of the fundamental lattice and supperlattice, and derivation of chemical formula and structural formula are summarized. Fourier map of the fundamental structure showed that oxygen ion positions of TiO6 octahedra were splitted. This fact proved the tilting of octahedra which is cause of superlattice. The mechanisms of microwave dielectric properties are summarized. Finally, guidelines for the design of the microwave dielectric materials are presented.