scholarly journals Growth of Functional FeTi Clusters Covered with Carbon Layer

2008 ◽  
Vol 2008 ◽  
pp. 1-3
Author(s):  
Chihiro Kaito ◽  
Akihito Kumamoto ◽  
Ryoichi Ono ◽  
Yoshio Saito ◽  
Shigeru Morikawa
Keyword(s):  
Cluster Formation ◽  
Carbon Layer ◽  
Gas Pressure ◽  
Inert Gas ◽  
Graphitic Layer ◽  
Gas Atmosphere ◽  
Ar Gas

FeTi clusters with a diameter of less than 10 nm and covered with a graphitic layer have been preferentially produced in an gas atmosphere at pressures of 10 and 26.6 kPa by the simultaneous evaporation of Fe and Ti wires from a concave carbon boat. To compare this result with cluster formation in an inert gas atmosphere, the result for an Ar gas pressure of 10 kPa is also discussed. The formation of disordered FeNi clusters predominately took place in an gas atmosphere.

scholarly journals Recovery of Hydrogen Isotopes by Pd-coated ZrNi from Inert Gas Atmosphere Containing Impurities

2001 ◽  
Vol 38 (11) ◽  
pp. 952-958 ◽  
Author(s):  
Kan ASHIDA ◽  
Yuji HATANO ◽  
Wataru NISHIDA ◽  
Kuniaki WATANABE ◽  
Asami AMANO ◽  
...  
Keyword(s):  
Hydrogen Isotopes ◽  
Inert Gas ◽  
Gas Atmosphere

Experimental and theoretical study of the characteristics of LSPR peaks for metal NPs produced by controlling Ar ambient gas pressure to enhance the efficiency of solar cells

2021 ◽  
pp. 1-6
Author(s):  
Serap Yiğit Gezgin ◽  
Abdullah Kepceoğlu ◽  
Hamdi Şükür Kiliç
Keyword(s):  
Metal Nanoparticles ◽  
Ag Nanoparticles ◽  
Solar Spectrum ◽  
Wavelength Region ◽  
Gas Pressure ◽  
Metal Nanoparticle ◽  
Ag Nanoparticle ◽  
Extinction Cross Section ◽  
Ambient Gas ◽  
Ar Gas

In this study, silver (Ag) nanoparticle thin films were deposited on microscope slide glass and Si wafer substrates using the pulsed-laser deposition (PLD) technique in Ar ambient gas pressures of 1 × 10−3 and 7.5 × 10−1 mbar. AFM analysis has shown that the number of Ag nanoparticles reaching the substrate decreased with increasing Ar gas pressure. As a result of Ar ambient gas being allowed into the vacuum chamber, it was observed that the size and height of Ag nanoparticles decreased and the interparticle distances decreased. According to the absorption spectra taken by a UV–vis spectrometer, the wavelength where the localised surface plasmon resonance (LSPR) peak appeared was shifted towards the longer wavelength region in the solar spectrum as Ar background gas pressure was decreased. This experiment shows that LSPR wavelength can be tuned by adjusting the size of metal nanoparticles, which can be controlled by changing Ar gas pressure. The obtained extinction cross section spectra for Ag nanoparticle thin film was theoretically analysed and determined by using the metal nanoparticle–boundary element method (MNPBEM) toolbox simulation program. In this study, experimental spectrum and simulation data for metal nanoparticles were acquired, compared, and determined to be in agreement.

scholarly journals Effect of Ar Gas Pressure on Mechanical Properties of Sputtered Ti Thin Films

2005 ◽  
Vol 125 (7) ◽  
pp. 313-318 ◽  
Author(s):  
Hirofumi Ogawa ◽  
Shinji Kaneko ◽  
Kiyoteru Suzuki ◽  
Ryutaro Maeda
Keyword(s):  
Thin Films ◽  
Mechanical Properties ◽  
Gas Pressure ◽  
Ar Gas

Effect of Ar Gas Pressure on Magnetic Properties of Sputter-Deposited Fe–Cu Alloys

1989 ◽  
Vol 28 (Part 1, No. 3) ◽  
pp. 361-367 ◽  
Author(s):  
Kenji Sumiyama ◽  
Koichi Takemura ◽  
Noriyuki Kataoka ◽  
Yoji Nakamura
Keyword(s):  
Magnetic Properties ◽  
Gas Pressure ◽  
Cu Alloys ◽  
Sputter Deposited ◽  
Ar Gas

Characterization of nanomagnetites co-precipitated in inert gas atmosphere for plant nutrition

2018 ◽  
Vol 239 (1) ◽  
Author(s):  
A. Lengyel ◽  
Z. Homonnay ◽  
K. Kovács ◽  
Z. Klencsár ◽  
Sz. Németh ◽  
...  
Keyword(s):  
Plant Nutrition ◽  
Inert Gas ◽  
Gas Atmosphere

Pouring of steel and alloys in an inert gas atmosphere

Metallurgist ◽  
1969 ◽  
Vol 13 (1) ◽  
pp. 30-32
Author(s):  
N. S. Vachugova ◽  
N. V. Sidorov ◽  
G. A. Khasin ◽  
S. K. Filatov
Keyword(s):  
Inert Gas ◽  
Gas Atmosphere

scholarly journals One-Step Soft Chemical Synthesis of Magnetite Nanoparticles under Inert Gas Atmosphere. Magnetic Properties and In Vitro Study

Nanomaterials ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 1500
Author(s):  
Laura Madalina Cursaru ◽  
Roxana Mioara Piticescu ◽  
Dumitru Valentin Dragut ◽  
Robert Morel ◽  
Caroline Thébault ◽  
...  
Keyword(s):  
Crystallite Size ◽  
Magnetite Nanoparticles ◽  
Biomedical Applications ◽  
Magnetic Measurements ◽  
Magnetic Moments ◽  
Inert Gas ◽  
Size Analysis ◽  
Hydrodynamic Diameter ◽  
Magnetic Cores ◽  
Gas Atmosphere

Iron oxide nanoparticles have received remarkable attention in different applications. For biomedical applications, they need to possess suitable core size, acceptable hydrodynamic diameter, high saturation magnetization, and reduced toxicity. Our aim is to control the synthesis parameters of nanostructured iron oxides in order to obtain magnetite nanoparticles in a single step, in environmentally friendly conditions, under inert gas atmosphere. The physical–chemical, structural, magnetic, and biocompatible properties of magnetite prepared by hydrothermal method in different temperature and pressure conditions have been explored. Magnetite formation has been proved by Fourier-transform infrared spectroscopy and X-ray diffraction characterization. It has been found that crystallite size increases with pressure and temperature increase, while hydrodynamic diameter is influenced by temperature. Magnetic measurements indicated that the magnetic core of particles synthesized at high temperature is larger, in accordance with the crystallite size analysis. Particles synthesized at 100 °C have nearly identical magnetic moments, at 20 × 103 μB, corresponding to magnetic cores of 10–11 nm, while the particles synthesized at 200 °C show slightly higher magnetic moments (25 × 103 μB) and larger magnetic cores (13 nm). Viability test results revealed that the particles show only minor intrinsic toxicity, meaning that these particles could be suited for biomedical applications.

Oxygen Reduction Effect on T’-Pr2-xCexCuO4 Nanopowders in the Underdoped Regime Studied by X-Ray Absorption near Edge Structure

2018 ◽  
Vol 936 ◽  
pp. 93-97 ◽  
Author(s):  
Irfanita Resky ◽  
Putu Eka Dharma Putra ◽  
Triono Bambang ◽  
Saiyasombat Chatree ◽  
Kamonsuangkasem Krongthong ◽  
...  
Keyword(s):  
Oxidation State ◽  
Oxidation States ◽  
Edge Structure ◽  
X Ray ◽  
Reduction Annealing ◽  
Gas Atmosphere ◽  
Reduction Effect ◽  
Ar Gas ◽  
X Ray Absorption ◽  
Cu Ions

This research is aimed to examine oxidation state of Copper (Cu) in both as-synthesized and reduced T’-Pr2-xCexCuO4 (T’-PCCO) with x = 0, 0.10, and 0.15 using Cu K-edge x-ray absorption near edge structure (XANES). The T‘-PCCO nanopowders were successfully synthesized by the chemically dissolved method with HNO3 as a dissolving agent continued by calcination at 1000°C for 15 h. The reduced T’-PCCO nanopowders were obtained by reduction annealing process at 700°C for 5 h under Ar gas atmosphere. The analyses of XANES spectra show that oxidation states of the Cu ions in all of the T'-PCCO nanopowders have values between +1 and +2. This indicates the existence of electron doping in the CuO2 planes, even in the undoped T’-structure. It is found that the oxidation states of the Cu ions change after reduction annealing depending on the existence of apical oxygen in the T'-structure. Based on the XANES analyses, it is revealed that the change of oxidation state is influenced by the presence of both electron and hole carriers in the two-carrier model of T’-structure.

LIGHT EMISSION DURING EVAPORATION OF Ge IN AN Ar-GAS ATMOSPHERE

1996 ◽  
Vol 03 (01) ◽  
pp. 499-504
Author(s):  
Y. SASAKI ◽  
J. SATO ◽  
A. KASUYA ◽  
Y. NISHINA
Keyword(s):  
Emission Spectrum ◽  
Emission Intensity ◽  
Light Emission ◽  
Evaporation Process ◽  
Vapor Density ◽  
Gas Atmosphere ◽  
High Emission ◽  
Evaporation Source ◽  
Ar Gas ◽  
High Emission Intensity

We have observed light emission from Ar atoms [Ar(I)], Ge atoms [Ge(I)]/clusters[Ge2], and Ge ions [Ge(II)] during the evaporation process of Ge in an Ar-gas atmosphere of a few Torr. The Ar(I) lines are observed regardless of whether the crucible is empty or filled with Ge. Ar atoms are excited through discharge initiated by electrons thermionically emitted from the hot W wire heating the crucible and accelerated by the potential applied to the wire. Since the emission due to Ge is observed only when the Ar(I) lines are observed, it is concluded that Ge atoms are excited by excited Ar atoms and possibly ions. Intensities of Ar(I) lines decrease by transferring energy to Ge atoms/clusters if the density of Ge vapor is high. Emission intensity diminishes with distance from the crucible surrounded by a heat reflector and a water-cooled shroud, dropping most rapidly for Ge(II), and progressively less rapidly for Ge(I), Ar(I), and Ge2. The Ge(II) lines are stronger for lower Ar pressures and for lower Ge vapor density, while the Ge2 line is stronger for higher Ar pressures. The relative intensities of Ar(I), Ge(I), GE(II), and Ge2 also depend on the structure of the evaporation source. Reabsorption of emitted light by Ge clusters modifies the profile of the emission spectrum at ~3.7 and 4.3 eV.

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