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[en] In arc-melted nickel-tantalum-nitrogen alloys annealed at 1,0000C and water quenched, the composition of the ternary nitride corresponds to Ni2Ta4N and its structure is that of a filled NiTi2 (eta-carbide) type with a lattice constant between 11.547 and 11.556 A. A binary phase with the NiTi2 structure type is not observed. The effect of contamination by oxygen is discussed. (orig.)
[de]In im Lichtbogen geschmolzenen Nickel-Tantal-Stickstoff-Legierungen, die bei 1.0000C geglueht und in Wasser abgeschreckt worden sind, entspricht die Zusammensetzung des ternaeren Nitrides Ni2Ta4N. Es hat die Struktur des aufgefuellten NiTi2-Typs (eta-Karbidtyp) mit einer Gitterkonstante zwischen 11,547 und 11,556 A. Eine binaere Phase mit dem aufgefuellten NiTi2-Strukturtyp wird nicht beobachtet. Der Einfluss der Verunreinigung durch Sauerstoff wird besprochen. (orig.)
[en] Recently, the humidity sensors have captivated huge attention for making human life more comfortable and to diagnose several diseases. Here, we reported the excellent humidity responsiveness of V0.5Sn0.5Se2 ternary alloy for human breath monitoring and touchless positioning interface. The resistive sensor based on direct vapour transport grown bulk crystal of V0.5Sn0.5Se2 ternary alloy is fabricated and explored for its static response in different humidity levels ranging from 20 to 90%. The sensor showed excellent dynamic switching characteristics between relative humidity of 20% and 90% with responsivity of 6.78%, response time of 3.2 s and recovery time of 2.3 s. Subsequently, the sensor is exploited for giant responsiveness for human breath monitoring and words recognitions. The sensor exhibited quite distinct response towards different words namely, “Pratik”, “Chetan” and “Mohit”. Besides, novel touch-less positioning interface is explained with respect to humidity variation. Overall, the results advocate development of resistive sensors for intended humidity, biomedical as well as for intelligent touch-less sensing applications.
[en] Research highlights: → The full experimental results of the Ti-Al-Cr ternary system and its sub-binary systems are reviewed and analysed in detail. → Based on the latest thermodynamic assessments of the Ti-Al, Ti-Cr and Al-Cr systems and the ternary experimental data in literature, the thermodynamic parameters of the Ti-Al-Cr ternary system are fully assessed by the Calphad method. → The transformation of disorder to order (bcca2 to B2) and the new ternary compound L12Ti25Cr8Al67 are considered in this work. - Abstract: The Ti-Al-Cr ternary system is one of the most important systems to studying the titanium alloys. Some experimental data of this ternary system are available and a few partial thermodynamic assessments are reported. However, no full thermodynamic descriptions were published. In this study, the previous work on the Ti-Al-Cr system and its related binary systems are reviewed. Based on the thermodynamic descriptions of the Ti-Al, Ti-Cr and Al-Cr systems and the ternary experimental data in literature, the Ti-Al-Cr ternary system is assessed by means of the Calphad method. Several isothermal sections from 1073 K to 1573 K and some invariant reactions are calculated, which are in good agreement with the most of the experimental results.
[en] The concentration dependence of the resistance of the alloys of Ni_3Mn_xAl_1_−_x system is described in the framework of the percolation theory in the model of an effective medium. The regions corresponding to the alloys of terminal compositions are present in the entire volume of the samples. The formation of an infinite cluster occurs near the percolation threshold x=0.3 for the phase of the Ni_3Al and x=0.7 for the phase of the Ni_3Mn type. This makes it possible to suppose that in the ternary Ni_3Mn_xAl_1_−_x alloys in the intermediate region of concentrations there is realized an inhomogeneous heterophase structure.
[en] Research highlights: → The effect of F doping on the optical, structural and surface properties of ultrasonically sprayed CdO films has been investigated. F doping affected each of these properties. → The low cost of the production system is an advantage for potential applications of these films. CF4 film caused the transmittance values to increase which is a desired development for transparent conducting oxide industry. → Low reflectance value of CF2 film makes this sample a promising material for anti-reflection coatings. → F doping has found to be an alternative solution to increase the narrow band gap of CdO films. This is an other development of CdO:F films for optoelectronic and photovoltaic solar cell applications. → Rough samples may be an alternative in single-junction μc-Si solar cells having superstrate configuration. When we take into account the refractive index and rough surface of the samples, rough interface between a low refractive index material (CdO:F, n ∼ 1.6) and a high refractive index material (for Si n ∼ 3.7) results in reduced reflection due to gradual refractive index matching. In order to increase this effect high rms roughness (Rq) values needed. Also this will allow light trapping into Si layer and cause back and forth scattering at the interfaces increasing the optical path within the Si layer. - Abstract: In this work, we report the effect of F doping on some physical properties of CdO films. Ultrasonic spray pyrolysis technique has been used to obtain the films. Thicknesses, refractive indices and extinction coefficients of the films have been determined by spectroscopic ellipsometry technique using Cauchy-Urbach model for fitting. Transmission and reflectance spectra have been taken by UV spectrophotometer, and band gap values have been determined by optical method. X-ray diffraction patterns have been used to study the structural properties such as crystallinity level, texture coefficient, crystallite size and lattice constants. Atomic force microscope images have been taken to see the effect of F doping on surface topography and roughness of CdO films. Finally, it has been concluded that both of the F doped CdO films have improved properties and are promising materials for solar cell applications.
[en] The 'gas-like' model of viscosity for liquid alloys is examined in evaluation for the viscosity of binary and ternary liquid alloys of Ag, Au and Cu. The detail procedure to evaluate the viscosity of multi-component liquid alloys is given. The model predicts the overall experimental data of the viscosities for Ag-Au-Cu liquid alloys consistently with those for the component atomic liquid metals and the respective binary liquid alloys
[en] A highly ordered long-period stacking order (LPSO) structure of 10H-type is found to form in Mg75Zn10Y15 (at.%) alloys annealed at 773 K, with a remarkably developed in-plane long-range order of Zn/Y atoms. The degree of order of the present 10H-LPSO Mg–Zn–Y phase is similar to that of the Mg–Al–Gd alloys, the structural characteristics of which are described according to order/disorder-type intermetallic polytypes. The measured composition Mg77.2Zn9.7Y13.1 appears to be precisely consistent with an ideal stoichiometry of the 10H-Mg23Zn3Y4 (Mg76.7Zn10Y13.3) phase
[en] A positive vetting approach to the assessing of experimental phase diagram data is described and is illustrated by examples taken from binary systems. Methods for checking the validity of ternary phase diagrams are reviewed using examples taken from the literature. (orig.)
[en] In calculating phase diagrams of ternary alloys, the conventional method uses the Bragg--Williams approximation and solves simultaneous equations by the Newton--Raphson iteration method. A completely new iteration technique called the Natural Iteration (NI) method is explained in this paper for the pair approximation of the cluster-variation method. The advantages of the NI technique are that it converges whatever the choice of the initial state may be and that the free energy always decreases monotonically as the iteration progresses. It is then shown that a modified NI method works for the B--W approximation. In the NI technique, the chemical potentials play the key role; the chemical potential diagram for ternary alloys is introduced and its general properties are discussed