Nanotube Morphology Changes on the Ti–xNb–Ag–Pt Alloy with Nb Contents

2020 ◽  
Vol 20 (9) ◽  
pp. 5751-5754 ◽  
Author(s):  
Hyun-Jun Kim ◽  
Han-Cheol Choe
Keyword(s):  
Power Supply ◽  
Equilibrium Structure ◽  
Vacuum Furnace ◽  
Dc Power ◽  
Arc Melting ◽  
Nb Content ◽  
Pt Alloy ◽  
The Difference ◽  
Morphology Changes ◽  
Anodization Method

The purpose of this study was to investigate the nanotube morphology changes of Ti–xNb–Ag–Pt alloys with Nb content. Ti–xNb–Ag–Pt was fabricated using arc melting vacuum furnace. The Ti– xNb–Ag–Pt ingot was further homogenized in an Ar atmosphere at 1100 °C for 1 h in a vacuum and then quenched at 0 °C. Nanotube formation on the samples was performed using anodization method with a DC power supply at 30 V for 2 h in 1 M H3PO4 +0.8 wt.% NaF at 25 °C. The surface morphology was observed using OM, FE-SEM, EDS, and XRD. In the microstructure of Ti–xNb–Ag–Pt alloy, needle-like structures on α and α″ gradually disappeared with increasing Nb, β-phase equilibrium structure appeared, and particle size decreased. The nanotube morphology of the Ti–xNb–Ag–Pt alloy changed according to the content of Nb. As the Nb content increases, the highly ordered nanotubes have changed to irregular nanotubes. The difference in dissolution area at the bottom of the nanotube was depending on the Nb content.

The Synthesis and Structure of Anodized Titania Nanotubes for Energy Conversion Materials

2015 ◽  
Vol 1105 ◽  
pp. 220-224 ◽  
Author(s):  
Rinnatha Vongwatthaporn ◽  
Narongsak Kodtharin ◽  
Udom Tipparach
Keyword(s):  
Power Supply ◽  
Ammonium Fluoride ◽  
Deionized Water ◽  
Titania Nanotubes ◽  
X Ray Diffraction ◽  
X Ray ◽  
Dc Power ◽  
Conversion Materials ◽  
Anodic Voltage ◽  
Anodization Method

Titania nanotubes (TiO2NTs) photoanodes were synthesized by anodization method. The electrolytes were the mixtures of ethylene glycol (EG), ammonium fluoride (0.3 wt % NH4F) and deionized water (2 Vol % H2O) with different concentrations of dopant Fe (NO3)3∙9H2O. A constant dc power supply at 50 V was used as anodic voltage. The samples were annealed at 450 °C for 2 hours. The resultant products were characterized by Scanning Electron Microscopy (SEM) and X-ray diffraction (XRD) to determine their microstructure when TiO2NTs were doped with different amounts of Fe atoms. The diameters of TiO2NTs were about60-120 nm. The highest density of TiO2NTs was obtained when the nanotubes were doped with 0.01 M of Fe.

Measurement and Testing of the NSRRC Power Supply for Conduction EMI

2013 ◽  
Vol 818 ◽  
pp. 153-158
Author(s):  
Chen Yao Liu ◽  
Kuo Bin Liu
Keyword(s):  
Power Supply ◽  
Electromagnetic Interference ◽  
High Performance ◽  
Current Mode ◽  
Beam Current ◽  
Power Supplies ◽  
Output Current ◽  
Power Bus ◽  
Dc Power ◽  
The Difference

The correction power supplies are working in the Taiwan Photon Source (TPS) of NSRRC. They are required to output current at high quality and with high performance and that has long-term stability, with output current ripple required to be less than 10ppm. The TPS comprises more than 1200 units of independent power-supplymodules working together when the beam current is at3-GeV status. The power supplies are all working in current mode. We willplan to build a new measurement laboratory for conduction Electromagnetic Interference (EMI) to measure and to test the switching DC power bus thatfeeds the correction power supplies. We can get conduction electromagnetic interferencenoise from the measurement equipmentto measure the switching DC power bus is an AC-to-DC voltage bus source.With the LISN obtainingthe conduction noise, it is a high-frequency voltage noise generated by the switching mode of the power-supply conduction noise. The current signal passes an AC source-impedance stabilized network LISN, and a spectrum analyzer obtains the conduction noise. We use a noise separator to separate the common EMI noise and the difference-mode EMI noise for EMI filtering design. The measurement results are illustrated in this paper.

High power density of AlGaAs/InGaAs doped-channel FETs with low DC power supply

2001 ◽  
Vol 37 (9) ◽  
pp. 597
Author(s):  
H.C. Chiu ◽  
S.C. Yang ◽  
F.T. Chien ◽  
Y.J. Chan
Keyword(s):  
Power Density ◽  
High Power ◽  
Power Supply ◽  
High Power Density ◽  
Dc Power ◽  
Dc Power Supply

scholarly journals Study of Structural, Magnetic, and Mossbauer Properties of Dy2Fe16Ga1−xNbx (0.0 ≤ x ≤ 1.0) Prepared via Arc Melting Process

2021 ◽  
Vol 7 (3) ◽  
pp. 42
Author(s):  
Jiba N. Dahal ◽  
Kalangala Sikkanther Syed Ali ◽  
Sanjay R. Mishra
Keyword(s):  
Isomer Shift ◽  
Cell Volume ◽  
Intermetallic Compounds ◽  
Unit Cell Volume ◽  
Rietveld Analysis ◽  
Unit Cell ◽  
X Ray Diffraction ◽  
X Ray ◽  
Arc Melting ◽  
Nb Content

Intermetallic compounds of Dy2Fe16Ga1−xNbx (x = 0.0 to 1.00) were synthesized by arc melting. Samples were investigated for structural, magnetic, and hyperfine properties using X-ray diffraction, vibration sample magnetometer, and Mossbauer spectrometer, respectively. The Rietveld analysis of room temperature X-ray diffraction data shows that all the samples were crystallized in Th2Fe17 structure. The unit cell volume of alloys increased linearly with an increase in Nb content. The maximum Curie temperature Tc ~523 K for x = 0.6 sample is higher than Tc = 153 K of Dy2Fe17. The saturation magnetization decreased linearly with increasing Nb content from 61.57 emu/g for x = 0.0 to 42.46 emu/g for x = 1.0. The Mössbauer spectra and Rietveld analysis showed a small amount of DyFe3 and NbFe2 secondary phases at x = 1.0. The hyperfine field of Dy2Fe16Ga1−xNbx decreased while the isomer shift values increased with the Nb content. The observed increase in isomer shift may have resulted from the decrease in s electron density due to the unit cell volume expansion. The substantial increase in Tc of thus prepared intermetallic compounds is expected to have implications in magnets used for high-temperature applications.

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