E.I. Pogoreltsev
Siberian Federal University
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Featured researches published by E.I. Pogoreltsev.
Ferroelectrics | 2010
E.I. Pogoreltsev; I. N. Flerov; N. Laptash
In order to understand the role of central atom in the nature of phase transitions in two series of ammonium oxyfluorides, A2MeO2F4 and A2A′MeOxF6-x, the permittivity was studied in wide temperature range. In most cases structural distortions are associated with the ferroelasticity. The ferro- and antiferroelectric properties were revealed only in molybdates.
Ferroelectrics | 2016
E.I. Pogoreltsev; E. V. Bogdanov; A. V. Kartashev; Maxim S. Molokeev; I. N. Flerov; N. M. Laptash
ABSTRACT The heat capacity, thermal expansion, and T-p phase diagrams of (NH4)3TiF7 and (NH4)3SnF7 were studied in wide temperature and pressure ranges. The total excess entropies at successive Pa-3 ↔ P4/mnc ↔ 4/m (Ti) and single Pa-3 ↔ Pm-3m (Sn) phase transitions are close to each other and characteristic for the order–disorder processes. The Pm-3m cubic phase and direct Pa-3 ↔ Pm-3m transformation were found at high pressure in (NH4)3TiF7. The different sign of baric coefficients for phase transition between two cubic phases in (NH4)3TiF7 and (NH4)3SnF7 was supposed due to nonlinear phase boundary with pressure in the latter fluoride.
Inorganic Chemistry | 2017
E. V. Bogdanov; E.I. Pogoreltsev; M. V. Gorev; I. N. Flerov
Thermal and dielectric studies of (ND4)2MoO2F4 crystals undergoing successive phase transitions at T1 = 272 K and T2 = 181 K showed that deuteration is accompanied by an increase in the chemical pressure in the crystal lattice (Δp ≈ 0.02 GPa), which shifts the Cmcm ↔ Pnma transformation for the first order to the tricritical point. The direct participation of ammonium groups in the mechanism of structural distortions is demonstrated by a decrease in the entropy of the high-temperature phase transition (ΔS1 = R ln 6.0). An external hydrostatic pressure leads to an expansion of the temperature interval of the intermediate antiferroelectric Pnma phase. The triple point on the T-p phase diagram, where the Cmcm, Pnma, amd Pnma* phases coexist, can be realized at a negative pressure of ptrp ≈ -0.8 GPa.
Journal of Fluorine Chemistry | 2014
S.V. Mel’nikova; E.I. Pogoreltsev; I. N. Flerov; N. M. Laptash
Journal of Fluorine Chemistry | 2014
E.I. Pogoreltsev; I. N. Flerov; A.V. Kartashev; E. V. Bogdanov; N. M. Laptash
Journal of Fluorine Chemistry | 2013
V.D. Fokina; M. V. Gorev; E. V. Bogdanov; E.I. Pogoreltsev; I. N. Flerov; N. M. Laptash
Journal of Fluorine Chemistry | 2015
I. N. Flerov; Maxim S. Molokeev; N. M. Laptash; A.A. Udovenko; E.I. Pogoreltsev; S.V. Mel’nikova; S. V. Misyul
Journal of Fluorine Chemistry | 2011
I. N. Flerov; M. V. Gorev; V.D. Fokina; A.F. Bovina; E. V. Bogdanov; E.I. Pogoreltsev; N. M. Laptash
Journal of Fluorine Chemistry | 2016
I. N. Flerov; A.V. Kartashev; M. V. Gorev; E. V. Bogdanov; Svetlana V. Mel’nikova; Maxim S. Molokeev; E.I. Pogoreltsev; Natalia M. Laptash
Dalton Transactions | 2017
S. V. Mel'nikova; Maxim S. Molokeev; N. M. Laptash; E.I. Pogoreltsev; S. V. Misyul; I. N. Flerov