scholarly journals Thickness- and temperature-dependent structural and electromechanical properties of (100)-oriented Sc-doped (Na0.85K0.15)0.5Bi0.5TiO3 ferroelectric films

RSC Advances ◽  
2017 ◽  
Vol 7 (70) ◽  
pp. 44136-44143
Author(s):  
Yunyi Wu ◽  
Yonghong Hu ◽  
Xiaohui Wang ◽  
Caifu Zhong ◽  
Longtu Li
Keyword(s):  
Film Thickness ◽  
Composite Films ◽  
Temperature Dependent ◽  
Electromechanical Properties ◽  
Ferroelectric Films

NKBT-Sc film thickness- and LNO layer insertion mode-dependent structural and electromechanical properties of the composite films were investigated.

(111) Monocrystalline Nickel Films

1972 ◽  
Vol 30 ◽  
pp. 512-513
Author(s):  
T.E. Pratt ◽  
R.W. Vook
Keyword(s):  
Film Thickness ◽  
Deposition Rate ◽  
Room Temperature ◽  
Narrow Range ◽  
High Vacuum ◽  
Residual Pressure ◽  
Temperature Dependent ◽  
Deposition Parameters ◽  
Transmission Electron ◽  
Substrate Temperatures

(111) oriented thin monocrystalline Ni films have been prepared by vacuum evaporation and examined by transmission electron microscopy and electron diffraction. In high vacuum, at room temperature, a layer of NaCl was first evaporated onto a freshly air-cleaved muscovite substrate clamped to a copper block with attached heater and thermocouple. Then, at various substrate temperatures, with other parameters held within a narrow range, Ni was evaporated from a tungsten filament. It had been shown previously that similar procedures would yield monocrystalline films of CU, Ag, and Au.For the films examined with respect to temperature dependent effects, typical deposition parameters were: Ni film thickness, 500-800 A; Ni deposition rate, 10 A/sec.; residual pressure, 10-6 torr; NaCl film thickness, 250 A; and NaCl deposition rate, 10 A/sec. Some additional evaporations involved higher deposition rates and lower film thicknesses.Monocrystalline films were obtained with substrate temperatures above 500° C. Below 450° C, the films were polycrystalline with a strong (111) preferred orientation.

scholarly journals Temperature Dependence of Electrical Properties and Crystal Structure of 0.29Pb(In1/2Nb1/2)O3–0.44Pb(Mg1/3Nb2/3)O3–0.27PbTiO3Single Crystals

2013 ◽  
Vol 2013 ◽  
pp. 1-5
Author(s):  
Qian Li ◽  
Yun Liu ◽  
Andrew Studer ◽  
Zhenrong Li ◽  
Ray Withers ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Phase Transition ◽  
Electrical Properties ◽  
Dielectric Permittivity ◽  
Neutron Diffraction ◽  
Electrical Measurement ◽  
Temperature Dependent ◽  
Electromechanical Properties ◽  
Polar Order

We characterized the temperature dependent (~25–200°C) electromechanical properties and crystal structure of Pb(In1/2Nb1/2)O3-Pb(Mg1/3Nb2/3)O3-PbTiO3single crystals usingin situelectrical measurement and neutron diffraction techniques. The results show that the poled crystal experiences an addition phase transition around 120°C whereas such a transition is absent in the unpoled crystal. It is also found that the polar order persists above the maximum dielectric permittivity temperature at which the crystal shows a well-defined antiferroelectric behavior. The changes in the electrical properties and underlying crystal structure are discussed in the paper.

Non-epitaxial, Highly Textured (001) CoPt:B2O3 Composite Films for Perpendicular Recording

2002 ◽  
Vol 721 ◽  
Author(s):  
M. L. Yan ◽  
N. Powers ◽  
D. J. Sellmyer
Keyword(s):  
Thin Films ◽  
Film Thickness ◽  
Epitaxial Growth ◽  
Thermal Processing ◽  
Composite Films ◽  
Annealing Process ◽  
Perpendicular Anisotropy ◽  
Perpendicular Recording ◽  
Nanocomposite Thin Films ◽  
Deposited Films

AbstractWe report the non-epitaxial growth of highly textured (001) CoPt:B2O3 nanocomposite thin films that are deposited directly on thermally-oxidized Si wafers. Multilayers of Co/Pt/Co/B2O3 are deposited followed by appropriate thermal processing. The as-deposited films are disordered fcc CoPt phase, and magnetically soft. After annealing, an (001) orientation of CoPt-ordered grains is developed. The texture development is dependent both on the total film thickness and the annealing process. Nearly perfect (001) texture can be obtained in films with thinner initial layer thicknesses. Strong perpendicular anisotropy is shown to be related to this (001) texture.

Temperature‐Dependent Spin–Orbit Torques in Perpendicular Magnetic [Co/Ni] N /TbCo Composite Films

2019 ◽  
Vol 5 (6) ◽  
pp. 1900014 ◽  
Author(s):  
Hongwei Xue ◽  
Shaohai Chen ◽  
Di Wu ◽  
Weihua Zhu ◽  
Yuanyuan Zhang ◽  
...  
Keyword(s):  
Composite Films ◽  
Spin Orbit ◽  
Temperature Dependent

Numerical Investigation of the Flow in a Hydrodynamic Thrust Bearing With Floating Disk

2013 ◽  
Vol 135 (2) ◽  
Author(s):  
Magnus Fischer ◽  
Andreas Mueller ◽  
Benjamin Rembold ◽  
Bruno Ammann
Keyword(s):  
Film Thickness ◽  
Thrust Bearing ◽  
Rotational Velocity ◽  
Control Unit ◽  
Axial Direction ◽  
Lubricating Oil ◽  
Temperature Dependent ◽  
Temperature Dependent Viscosity ◽  
Axial Thrust ◽  
Oil Film

In this paper we present a novel method for the numerical simulation of flow in a hydrodynamic thrust bearing with floating disk. Floating disks are commonly employed in turbochargers and are situated between the thrust collar, which is rotating at turbocharger speed, and the static casing. A floating disk reduces wear, improves the skew compensating capacity of the bearing, and is freely movable in the axial direction. The simulation model presented combines a commercial flow solver (ANSYS CFX) with a control unit. Based on physical principles and a predefined axial thrust, the control unit automatically sets the rotational speed of the floating disk, the mass flow of the oil supply, and the oil film thickness between the rotating disk and the casing wall and collar, respectively. The only additional inputs required are the temperature and the pressure of the oil at the oil feed and the turbocharger speed. The width of the computational grid of the thin lubricating oil film in the gaps is adjusted using a mesh-morphing approach. The temperature-dependent variation in viscosity is included in the model. The calculated solution of the flow field in the domain, the oil film thickness, and the resulting rotational velocity of the floating disk are validated against experimental data and demonstrate favorable agreement. The influence of uncertainties in the measurements and the behavior of the systems are thoroughly investigated in parametric studies that reveal the key influencing factors. These are the temperature-dependent viscosity of the oil, the axial thrust, and turbulence effects in the supply grooves and ducts of the floating disk. Using the model presented here, it is now possible to predict design variants for this type of bearing.

Determination of optical constants of Si/ZnO polycrystalline nanocomposites by spectroscopic ellipsometry

2001 ◽  
Vol 16 (12) ◽  
pp. 3554-3559 ◽  
Author(s):  
J. García-Serrano ◽  
N. Koshizaki ◽  
T. Sasaki ◽  
G. Martínez-Montes ◽  
U. Pal
Keyword(s):  
Film Thickness ◽  
Quartz Glass ◽  
Spectroscopic Ellipsometry ◽  
Optical Constants ◽  
Composite Films ◽  
Two Phase ◽  
Glass Substrates ◽  
Optical Functions ◽  
Substrate Film

The optical constants of Si/ZnO composite films grown on quartz glass substrates were determined in the spectral range 1.5–5.0 eV by spectroscopic ellipsometry using a rotating-analyzer ellipsometer. The structure of the samples was modeled by a two-phase (substrate–film) model, and the optical functions of the film were parameterized through different effective medium approximations. The results allowed us to estimate the microstructural film parameters, such as film thickness, the volume fractions of each of the constituents, and optical constants.

Effects of the Fraction of PTFE and Film Thickness on Wear and Friction in an ePTFE and Epoxy Composite Solid Lubricant Coating

2005 ◽  
Author(s):  
N. L. McCook ◽  
D. L. Burris ◽  
J. R. Hanrahan ◽  
W. G. Sawyer
Keyword(s):  
Film Thickness ◽  
Epoxy Composite ◽  
Composite Films ◽  
304 Stainless Steel ◽  
Solid Lubricant Coating ◽  
Wear Rates ◽  
Wear And Friction ◽  
Pin On Disk ◽  
Composite Solid ◽  
Wear Tests

Wear tests were performed on various expanded PTFE / epoxy composite films, using a 304 stainless steel pin, in a pin on disk configuration. The density and thickness of the expanded PTFE films were varied, and the effects on friction and wear were examined. It was found that there are trends for increased wear resistance with increasing density, and increasing film thickness. Wear rates less than 10−8 mm3/Nm were calculated on some of the composite films. The film thickness range from 75–510μm and the density ranged from 0.304 to 0.904 g/cm3. The tests were run at a 5N load and 1m/s sliding speed with varying sliding distances.

Effect of Film Thickness and Air Atmosphere on Photochromic Properties of WO3-Based Composite Films

2016 ◽  
Vol 89 (1) ◽  
pp. 20-23 ◽  
Author(s):  
Hidetoshi Miyazaki ◽  
Takumi Ishigaki ◽  
Hisao Suzuki ◽  
Toshitaka Ota
Keyword(s):  
Film Thickness ◽  
Composite Films ◽  
Photochromic Properties ◽  
Air Atmosphere
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