Network


Latest external collaboration on country level. Dive into details by clicking on the dots.

Hotspot


Dive into the research topics where E.I. Pogoreltsev is active.

Publication


Featured researches published by E.I. Pogoreltsev.


Ferroelectrics | 2010

Dielectric Properties and Phase Transitions in Some Oxyfluorides with the MeOxF6-x (x = 1, 2, 3) Anion in Structure

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

Thermal properties of (NH4)2MeF6·NH4F (Me: Ti, Sn) crystals undergoing transformation between two cubic phases

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

Effect of Deuteration on the Thermodynamic Properties of Dioxotetrafluoromolybdate(VI), (NH4)2MoO2F4

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

Unusual sequence of phase transitions in (NH4)3TiF7 detected by optic and calorimetric studies

S.V. Mel’nikova; E.I. Pogoreltsev; I. N. Flerov; N. M. Laptash


Journal of Fluorine Chemistry | 2014

Heat capacity, entropy, dielectric properties and T–p phase diagram of (NH4)3TiF7

E.I. Pogoreltsev; I. N. Flerov; A.V. Kartashev; E. V. Bogdanov; N. M. Laptash


Journal of Fluorine Chemistry | 2013

Thermal properties and phase transitions in (NH4)3ZrF7

V.D. Fokina; M. V. Gorev; E. V. Bogdanov; E.I. Pogoreltsev; I. N. Flerov; N. M. Laptash


Journal of Fluorine Chemistry | 2015

Structural transformation between two cubic phases of (NH4)3SnF7

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

Disorder and phase transitions in oxyfluoride (NH4)3Ta(O2)2F4

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

Thermal, structural, optical, dielectric and barocaloric properties at ferroelastic phase transition in trigonal (NH4)2SnF6: A new look at the old compound

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

Sequence of phase transitions in (NH4)3SiF7

S. V. Mel'nikova; Maxim S. Molokeev; N. M. Laptash; E.I. Pogoreltsev; S. V. Misyul; I. N. Flerov

Collaboration


Dive into the E.I. Pogoreltsev's collaboration.

Top Co-Authors

Avatar

I. N. Flerov

Russian Academy of Sciences

View shared research outputs
Top Co-Authors

Avatar

E. V. Bogdanov

Russian Academy of Sciences

View shared research outputs
Top Co-Authors

Avatar

N. M. Laptash

Russian Academy of Sciences

View shared research outputs
Top Co-Authors

Avatar

M. V. Gorev

Siberian Federal University

View shared research outputs
Top Co-Authors

Avatar

Maxim S. Molokeev

Siberian Federal University

View shared research outputs
Top Co-Authors

Avatar
Top Co-Authors

Avatar

Natalia M. Laptash

Russian Academy of Sciences

View shared research outputs
Top Co-Authors

Avatar

S. V. Misyul

Siberian Federal University

View shared research outputs
Top Co-Authors

Avatar

O. A. Bayukov

Russian Academy of Sciences

View shared research outputs
Top Co-Authors

Avatar

A. Tressaud

University of Bordeaux

View shared research outputs
Researchain Logo
Decentralizing Knowledge