Special Features of Thermal and Stress Hysteresis of B2–R–B19' Martensitic Transformations in Aged [001]-Oriented Ti–50.6 at.% Ni Single Crystals

Russian Physics Journal - Stress-induced and thermal-induced martensitic transformations (MTs) in compression were investigated in [001]-oriented Ti–50.6 at.% Ni single crystals aged at 573 K...     

Ultrasonic transducers based on piezoelectric polymer films for operation in air

The paper presents the results of experimental studies of radiating piezoelectric elements made on the basis of self-supported piezoelectric polymer films. The dependences of the sensitivity of these elements on the geometric parameters and frequency are investigated within a frequency band of 10?C70 kHz. A radiating device containing an ensemble of more than 4000 piezoelectric elements is constructed.     

Oligomeric epoxy binders with controllable molecular characteristics: Shrinkage upon curing

Experimental data and generalized dependences of the effect of molecular characteristics of epoxy diane oligomers (EDOs) and mixtures thereof of various compositions on the value of volume shrinkage are presented. It is established that EDOs and mixtures thereof with a low molecular weight (to 400) and the content of the first fraction over 90 vol % have the highest value of shrinkage by the moment of gel formation, which allows one to obtain polymeric composite materials and adhesive joints with a low level of residual stresses and high physicomechanical characteristics.     

Tunneling Relaxation Mechanisms of the Jahn–Teller Complexes in a CaF2:Cr2+ Crystal

JETP Letters - The temperature dependences of attenuation and the velocity of ultrasonic waves at frequencies of 26–158 MHz in a CaF2 fluorite crystal at the substitution of...     

Low-temperature relaxation in the ZnSe : V<Superscript>2+</Superscript> crystal

Low-temperature anomalies in absorption of the fast transverse and longitudinal ultrasonic waves are revealed in a ZnSe crystal lightly doped (5.6 × 10¹⁸ cm^?3) with V²⁺ ions. These anomalies are interpreted as a manifestation of the Jahn-Teller effect. The temperature dependence of the relaxation time of the impurity 3d electrons is established.     

Solubility of monazite chemical components in humic acid solutions

The α-factor is a measure of the epithermal neutron flux deviation from the ideal distribution 1/E, where E is neutron energy. It defends on the position of the irradiation channel in reactor. A determination method of the α-factors in irradiation channels of Dalat reactor is presented by fitting the epithermal neutron spectrum obtained from the calculation using MCNP code. The fitting α-values were compared to those by experiment used the “Cd-ratio” method with monitors ¹⁹⁷Au–⁹⁴Zr and ¹⁹⁷Au–⁶⁴Zn. It shows that the α-values calculated from neutron spectra agree well with experimental ones. The difference between both data is about 6%.     

Transport Properties of Solid Electrolytes: Effect of the Isotope Composition of Lithium Charge Carriers

The isotope composition of lithium charge carriers is experimentally found to severely affect transport in solid electrolytes -Li₃BO₃, Li₃N, Li₃AlN₂, Li₅SiN₃, Li₆MoN₄, Li₆WN₄, and LiCl. The lithium cation conduction of these decreases with increasing content of ⁶Li or ⁷Li and reaches a minimum at [⁶Li] = [⁷Li]. The activation energy for conduction increases, reaches a maximum in the same compositions, and then diminishes. Rates of spin–lattice relaxation of ⁷Li nuclei in electrolytes are studied by an NMR method at 15–35 MHz. The calculated activation energy for short-range motion (to one interatom distance) of lithium charge carriers in crystal lattices of electrolytes is lower than that for ionic conduction by 2–3 times, which is attributed to two types of correlation (electrostatic, isotopic) of charge carriers.     

Iron-Alloyed Vanadium Dioxide Analysis Using X-Ray Photoelectron Spectroscopy Technique

Russian Physics Journal - The paper presents the qualitative and quantitative elemental analysis of V0.93Fe0.07O2 compound powder performed by the X-ray photoelectron spectroscopy (XPS) technique....     

Hyperfine fields in the half-metallic ferromagnet NiMnSb

Using nuclear spin-echo technique the distribution of the hyperfine fields in the half-metallic ferromagnet NiMnSb is measured. An asymmetry of the NMR spectra is observed. At liquid helium temperatures a resolution of the⁵⁵Mn and¹²¹Sb resonance lines is obtained in zero applied field.