Yu. G. Zaynulin

Synthesis and properties of high-pressure phase [ErxCu3](V4)O12

AbstractA new perovskite-like compound Er0.73Cu3V4O12 (space group Im

Structure of the monoclinic modification of Re3B

\bar 3

Electrical properties of the perovskite-like phase of CaCoCu2V4O12 at pressures of up to 50 GPa

, Z = 2, a = 7.266 Å) has been synthesized barothermally (P = 8.0 GPa, t = 1000°C). Its electrical and magnetic properties have been studied. It is found that the temperature dependence of the electrical conductivity (in the range 78–300 K) has of semiconductor type. The behavior of the impedance and admittance has been analyzed at 290 K and frequencies of 200 Hz to 200 kHz under atmospheric pressure and at high (15–42 GPa) pressures.

Synthesis of CeCu3–xMnxV4O12 (x = 0–3) at High Pressures and Temperatures

TmxCu3V4O12, a perovskite-like oxide (space group, Im-3; Z = 2; a = 7.279–7.293 Å) containing vacancies in its cationic sublattice, was obtained barothermally (P = 7.0–9.0 GPa, t = 1000–1100°C) for the first time. The temperature dependences on the electrical resistivity (10–300 K) and the magnetic susceptibility (0–300 K) were investigated. It was shown that the oxide TmxCu3V4O12 is characterized by metal-type conductivity and paramagnetic properties.

Fractal analysis of fracture of powder metallurgical hard alloy

By powder X-ray diffraction the structure of the monoclinic modification of Re3B is studied. The phase is obtained under high pressure and high temperature (10 GPa, 1800°C) using nanocrystalline rhenium and amorphous boron. The results of the comparative crystal chemical analysis are reported.

Synthesis and electrical properties of new perovskite-like AMn3V4O12 (A = Ca, Ce, and Sm) compounds

New ACu3V4O12 (A=Gd, Tb, Er) phases have been prepared at high pressure and high-temperature conditions (P∼8–9 GPa, T∼1000°C) in a toroid-type high pressure cell. These compounds crystallize in the cubic symmetry with a perovskite-like structure. At ambient pressure, they are paramagnetic and have activation-type conductivity. The effect of high pressure (10–50 GPa) on the electrical properties of the materials was analyzed in the temperature range from 78 to 300 K. Pressure ranges of the transition from activation type to metallic conductivity have been determined. The crystal structure of ACu3V4O12 (A=Gd, Tb, Er) was found to be stable up to 50 GPa.

Influence of external effects on the electrical properties of high pressure perovskite-like phases CaCu3Ti4-xVxO12

The results from experimental investigations on the effect of high pressures (10–50 GPa) on the electrical properties and magnetoresistance of the perovskite-like high-pressure state of CaCoCu2V4O12 are presented. The pressure ranges of substantial changes in the behavior of electrical characteristics are determined.

Variation of Electroresistive Properties of Nanocrystalline Nd0.7Sr0.3MnO3 by Thermobaric Treatment under a Pressure of 9 GPa

CeCu3–xMnxV4O12 (x = 0–3) with perovskite-like structure are synthesized at high pressures and temperatures. Their crystal structures are characterized by X-ray diffraction (space group Im