Electrophysical characteristics of nonlinear resistors based on polymer-CuInSe2 + 10 mol % MnSe solid solution composite

The current-voltage characteristic and the resistivity of composite resistors (varistors) made of nonpolar propylene and CuInSe₂ (chalcopyrite) + 10 mol % MnSe solid solution are studied. It is found that the amount of the composite’s constituents influences both the current-voltage characteristic and the resistivity.     

Electrophysical characteristics of strontium tantalate

Results are offered from a study of thin film strontium tantalate (SrTa₂O₆) obtained by vacuum hf deposition. Temperature and frequency dependences of electrical conductivity, , tan , and thermostimulted dielectric depolarization current are studied in Al-SrTa₂O₆-Al structures. Point defect parameters and their distribution over energy in the dielectric forbidden zone are determined. Polarization and electrical conductivity mechanisms are considered, and it is concluded that strontium tantalate shows promise as a dielectric material for integrated circuits.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 7, pp. 61–65, July, 1989.     

Electrophysical characteristics of epitaxial cadmium telluride films

Equilibrium electrophysical characteristics of epitaxial CdTe films grown by the thermal screen method and the quasiclosed volume method are investigated. It is established that the films in both cases are semiconductors with inhomogeneous potential relief of the band to whose formation the main contribution is from barriers on the boundaries of the growth patterns. It is shown that jump conductivity with a variable jump length due to inhomogeneity of the potential relief of the bands and the high states density at the Fermi level is observed in CdTe films synthesized by the quasiclosed volume method for relatively high temperatures.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 3, pp. 72–76, March, 1990.     

Reciprocity relations for the nonlinear conductivity of fractal resistors

Reciprocity relations are derived for the conductivity of finite-size samples of inhomogeneous weakly nonlinear two-dimensional media. Zh. Tekh. Fiz. 68, 121–124 (November 1998)     

Electrophysical characteristics of 2D three-component regular structures

Electrophysical characteristics of two 2D double-periodic three component systems (models) are studied analytically and numerically. For a number of model parameters, the effective conductivity, the partial electric field strength moments of second order, and the effective Hall coefficient for both models are calculated and graphically tabulated.     

Electrical properties and stability of Tb-doped zinc oxide-based nonlinear resistors

The microstructure, electric field-current density (E-J), capacitance-voltage (C-V), and stability characteristics of Zn-Pr-Co-Cr-Tb oxide-based nonlinear resistors were investigated for different Tb₄O₇ amounts. It increased in the range of 8.9-42.0 in the nonlinear coefficient and in the range of 1026-6514 V/cm in the breakdown field with increasing Tb₄O₇ amount. As Tb₄O₇ amount increased, the donor density decreased in the range of 1.23×10¹⁸-0.70×10¹⁸/cm³, whereas the barrier height at grain boundaries increased in the range of 0.73-0.93 eV. A good stability was obtained in the range of 0.25-0.5 mol% in Tb₄O₇ amount.     

Electrophysical characteristics of accidental-doping defects in epitaxial n-type gallium arsenide

The Hall effect and electrical conductivity in the temperature range 10–900?K were used to investigate the electrophysical parameters of accidental defects in epitaxial n-type gallium arsenide. The experimentally determined parameters of the shallow donor impurity found in n-type gallium arsenide are similar to those of silicon. The anomalous behavior of the Hall constant at T>500?K can be accounted for by the hypothesis of thermal conversion of oxygen-containing defects (complexes of intrinsic and extrinsic defects) from a neutral state to an electrically active state. The kinetic parameters of this process are evaluated. The deviation of the experimental behavior of the electron mobility at temperature above 500?K can be attributed largely to the nonuniformity of the electrophysical parameters over the thickness of the gallium arsenide films and to the presence of accidental oxygen-containing defects in the investigated material.     

Electrophysical properties of composite films based on multiwalled carbon nanotubes under hydrostatic pressure

The effect hydrostatic pressure of up to 9 GPa has on the electrical behavior of polymer composites based on multiwalled carbon nanotubes (MWCNT) is investigated at room temperature. The ratio R _9GPa/R ₀ ≈ 7 for samples with resistance in the kilo-ohm range is higher than for samples in the ohm range. Pressure-induced MWCNT features at P ≈ 1.5 GPa are associated with the deformation of the circular form of nanotube walls, in agreement with theoretical predictions. Measurements of direct and reverse resistance and current voltage characteristics under pressure demonstrate the reversibility of electrophysical properties, which could find practical application in creating pressure sensors.     

The flow of electric current through the chain of nonlinear inertial resistors and capacitors

The stability conditions for an electric current flowing through a chain consisting of nonlinear inertial resistors and capacitors have been investigated. The necessary conditions for the field dependent conductivity and the inertia of the resistors and applied voltage leading to undamped oscillations in the chain have been derived. For the threshold voltage this condition has the form ₀+V ₀(/V) _v0 cos _I ^T =0, similar to that obtained in an earlier work of one of the authors from thermodynamical considerations.Computer simulation gives results for the frequency and threshold conditions in good agreement with approximate analytical solutions.     

Electrophysical properties of GaAs layers and the characteristics of fast particle GaAs detectors

Results of complex experiments aimed at finding a relationship between the properties of initial GaAs single-crystal wafers and epitaxial films and the threshold spectrometric characteristics of ionizing radiation detectors are reported.     

Preparation of well-defined polymer-silicon wafer hybrids via surface-initiated RAFT-mediated process

A simple method was developed for the immobilization of reversible addition-fragmentation chain-transfer (RAFT) initiators on the silicon surface. Well-defined polymer-silicon hybrids, including the tethered brushes of glycidyl methacrylate (GMA) polymer, poly(ethylene glycol) monomethacrylate (PEGMA) polymer and block copolymer on a silicon wafer, were prepared via surface-initiated RAFT living radical polymerization. The “living” chain ends were used as the macroinitiator for the subsequent synthesis of diblock copolymers.     

Stability of solitons in nonlinear composite media

An analysis is made of the dynamic stability of soliton solutions of the Hamilton equations describing plane waves in nonlinear elastic composite media in the presence and absence of anisotropy. In the anisotropiccase two two-parameter soliton families, fast and slow, are obtained in analytic form; in the absence of anisotropy there is a single three-parameter soliton family. It is shown that solitons from the slow family in an anisotropic composite and solitons in an isotropic composite are dynamically stable if their velocities lie in a certain range known as the range of stability. The analysis of stability is based on the spectral properties of the “linearized Hamiltonian” ?. It is shown that the operator ? is positively semidefinite on some linear subspace of the main solution space from which stability follows. Problems of instability of the fast soliton family in the anisotropic case and representatives of soliton families whose velocities lie outside the range of stability in the presence and absence of anisotropy are discussed.     

Investigation of Electrophysical Properties of ITO Films

Russian Physics Journal - The results of a study of the electrophysical characteristics of ITO films obtained by magnetron sputtering are presented. It is shown that a significant increase in the...     

Dynamic characteristics of composite laminates

An exact solution for the vibration of elastic composite laminates in cylindrical bending is presented. Dispersion curves for multi-layer symmetrical and unsymmetrical laminates with materials possessing high and low degrees of anisotropy at various fiber orientations are compared with those obtained from an approximate shear deformation theory. Mode shapes are also drawn for different wavelengths and their variation with fiber orientation is studied. Equations are developed for the wave propagation in an infinite medium consisting of a repeated pair of anisotropic layers by extending the “continuum” theory of Sun, Achenbach and Herrmann. Dispersion characteristics for 0–90° fiber orientations obtained by the “continuum” approach are also compared with those obtained by the exact method. The range of validity of each approximate theory is then assessed.