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Following recent computational studies of the processes of ion-bombardment-induced amorphization and re-crystallization in Si, which identified a possible major role of interstitial–vacancy (i–v) pairs or bond defects in these, a phenomenological model is developed which explains qualitatively, and semi-quantitatively, experimental and computational results. The model includes the effects of both...
The influence of the initial Si surface state on pore formation has been studied. For this purpose, samples were implanted by phosphorous ions at different doses and energies. Electrochemical characterisations and scanning electron microscopy (SEM) observations were made on phosphorous-implanted p-Si during the first stages of anodisation. After a short anodisation period in HF electrolyte, the topography...
Low-pressure RF argon gas discharge was used for surface modification of Safflower (Carthamus tinctorium L. semen) to increase the germination rate and activity and reduce the germination time. The results showed that plasma-treated C. tinctorium L. semen has 50% higher germination rate, 100% increase in the activity and 24h reduction in germination time relativeto untreated. The effect of two different...
The interfacial structure of the Mg/Al diffusion-bonded joint was studied by means of SEM, EPMA and TEM. The test results indicated that the interface zone of Mg/Al diffusion-bonded joint included the transition region on Mg side, the mid-diffusion region and the transition region on Al side. The concentration distribution of Mg and Al atoms in the diffusion zone includes three different regions....
The high-crystallinity and low-defect-density microcrystalline silicon films (μc-Si:H) was prepared by using a new hot-wire-assisted microwave electron cyclotron resonance–chemical vapor deposition (HWAMWECR–CVD) system. In this system the hot wire plays an important role in suppressing the growth of a-Si:H in favor of μc-Si:H, thus improving the physical properties. The experimental results show...
Crystal structure and microstructural properties of titanium dioxide thin films prepared by cathodic electrodeposition on indium-tin-oxide coated glass substrates from aqueous peroxo-titanium complex solutions have been investigated as a function of sintering temperature (25–500°C) for the first time. We have noticed pronounced photoinduced hydrophilicity for such thin films on exposure to ultraviolet...
The optical constants (absorption coefficient (α), refractive index (n), extinction coefficient (k), real and imaginary part of dielectric constant) have been studied for a-Se 96−x Te 4 Ag x (where x=0, 4, 8, 12) thin films as a function of photon energy in the wavelength range (500–1000nm). It has been found that the optical band gap increases while n and k decreases...
GaP 1−x N x thin films were deposited on glass substrates by RF sputtering employing a nitrogen–argon atmosphere in a partial pressure of 2×10 −2 Torr. We varied the growth temperature in the range 420–520°C. The film's optical properties were studied by transmittance and absorbance spectroscopy. Characterization by scanning electron microscopy in cross-sectional view,...
The plasma polymerised (PP) films were deposited on silicon substrates and used to bond the substrates at a low temperature (130°C). Different types of monomers were used to deposit PP films on μ-electrode and μ-channel of micro-fluidic devices (MFD) to tailor the surface properties. To confirm the PP film deposition on the substrates the surface chemistry was characterized using X-ray photoelectron...
FePt (50nm) and [FePt(xnm)/AlN(1, 2, 3nm)] 10 (x=2, 3nm) films were prepared by RF magnetron sputtering technique, then were annealed at 550°C for 30min. This work investigates the effect of AlN layer thickness on structure and magnetic properties of FePt/AlN multilayers. Superlattice (001) peaks can be found in the grazing incidence X-ray diffraction of FePt and [FePt (3nm)/AlN (1, 2, 3nm)]...
Fe-28Al(Cr) alloy and low-carbon steel were diffusion bonded in a vacuum of 10 −4 –10 −5 Pa. The relationship of the bond parameters and shear strength at the interface was discussed. Microstructure characteristics and the reaction products at the interface were investigated by scanning electron microscopy (SEM) and X-ray diffractometry (XRD). The thickness of the diffusion reaction...
In the present work, the effect of low temperature short-time rapid thermal processing (RTP) pretreatment on the average grain size and the crystallinity of the polycrystalline silicon thin films, fabricated by subsequent solid phase crystallization (SPC) of amorphous silicon (a-Si) thin films grown by radio-frequency plasma-enhanced chemical vapor deposition (RF-PECVD) at high temperature has been...
This paper reports the axial profiles of the electron temperature T e in the RF capacitive discharge in oxygen recorded with a probe technique. We observed the T e peaks near the boundaries of the sheaths as well as inside the near-electrode sheath. The T e peak inside the sheath is, probably, due to the formation of the double layer at the anode phase of this near-electrode...
The feasibility of 50μm thick diaphragms with a metallic film heater integrated on a quartz disc and working up to 500°C has been demonstrated. The diaphragms have been realized with the coupling of abrasive jet machining and mechanical polishing techniques. The metallic film has been obtained by means of a sequence of e-gun evaporation and electrochemical growth steps. No degradation of the adhesion...
It is known that boriding has been employed to increase the service life of parts such as orifices; ingot molds, and dies for hot forming made of AISI H13 steel. In this study, case properties and kinetics of borided AISI H13 steel have been investigated by conducting a series of experiments in Ekabor-I powders at the process temperature of 1073, 1173 and 1273K for periods of 1–5h. The presence of...
The world's largest cyclotron was built at TRIUMF in 1972 and commissioned to full energy in 1974 [Harwood VJ, Yandon JC. TRIUMF Design Note, TRI-69-7, 1969 [1], Blakely RG, Moore RW, Harwood VJ. TRIUMF Design Note, TRI-69-9, 1969 [2]]. The cyclotron accelerates negatively charged hydrogen ions up to 500MeV, and protons are produced by inserting a stripping foil in the beam which removes two electrons...
Metal-dielectric multilayers have versatile optical properties that can be used in many applications. The special properties of metal films in the near UV region are analyzed in terms of the d-band contribution to the plasma oscillation. The important parameters that determine the multilayer optical properties such as skin depth dependence on the wavelength and the thickness of silver films have been...
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