I. S. Ustinova

I. S. Ustinova
Ural Federal University | UrFU · Institute of Natural Sciences (1)

About

14
Publications
399
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43
Citations
Citations since 2017
1 Research Item
19 Citations
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2017201820192020202120222023012345
2017201820192020202120222023012345
2017201820192020202120222023012345

Publications

Publications (14)
Article
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 Im3 ¯ , Z = 2). The temperature dependences of their electroresistance are studied.
Article
We have prepared ceramic CaCu3Ti4O12 samples by solid-state reaction and investigated the effect of high-pressure/high-temperature processing (p = 8.0 GPa, t = 1100°C) on the structure and electrical properties of CaCu3Ti4O12.
Article
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Samples of high pressure perovskite-like phases CaCu3Ti4-xVxO12, x = 0.1, 0.2, 0.3, 0.4 and 0.5 were synthesized at high-pressure and high-temperature conditions in a toroid-type high-pressure chamber. Their electrical properties were studied by impedance spectroscopy in the frequency range from 1 Hz to 30 MHz at temperatures of 300 to 600 K and at...
Article
CaCu3Ti4O12 is prepared by means of solid-state sintering. The effect of thermobaric treatment (P = 8.0 GPa and T = 1100°C) and partial replacement of titanium by vanadium on the microstructure and dielectric properties of CaCu3Ti4O12 are investigated.
Article
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This paper is devoted to the analysis of structure of amorphous ionic conductors AgGe1+xAs1-xS3 with carbon nanotubes content, x = 0.4; 0.5; 0.6 by means X-ray and Raman spectroscopy. The influence of DC and AC electric field on the electrical properties of materials at ambient pressure, and at pressures up to 50 GPa was studied.
Article
Full-text available
The effects of high pressures on the electrical properties of the polycrystalline CuInSe2 and CuInS2 are studied. The resistance, magnetoresistance, thermoelectromotive force, impedance, admittance and loss tangent in high-pressure phases are estimated. The baric ranges of substantial changes in the behavior of all the investigated characteristics...
Article
Full-text available
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 pr...
Article
Full-text available
The perovskite-like compound Dyx Cu3V4O12 (x = 0.67–0.75) is synthesized under high pressure (P = 4.0–9.0 GPa) and temperature (T = 1000°C). Its crystal structure is determined (Im-3 space group, Z = 2, a = 7.29348(7) Å) by means of powder X-ray diffraction. The basic lengths and bond angles are defined. It is found that the high-pressure phase of...
Article
Full-text available
A new perovskite-like compound Gdx Cu3V4O12 (x = 0.67−0.73) is synthesized under high pressures (P = 4−9 GPa) and at high temperatures (T = 1000°C). Its structure (space group Im3, Z = 2, a = 7.2930(5) Å) is estrablished by X-ray analysis. The bond lengths and bond angles are determined. The temperature dependences of electrical resistivity (10–300...
Article
The electrical properties of new perovskite-like compounds ACu3V4O12 (A = Gd, Er, Tm) were studied at high pressures (10–50 GPa). The effect of the composition and structure of the compounds on the baric ranges of substantial changes in the behavior of the electrical characteristics was analyzed.
Article
Full-text available
A perovskite-like compound of composition CaCu3 − x Fex V4O12 (x = 0.7−1.0) has been synthesized at high pressures (p = 5.0−8.0 GPa) and temperatures (t = 1000−1300°C). Its crystal structure has been determined by X-ray diffraction (sp. gr. $Im\bar 3$ , Z = 2, a = 7.3051(5) angles have been evaluated. The electrical conductivity of the high-press...
Article
Full-text available
Tmx Cu3V4O12, 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 wa...
Article
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.
Article
A new perovskite-like compound Er0.73Cu3V4O12 (space group Im $ \bar 3 $ , 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 beha...

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