Blagoveschensk State Pedagogical University

Blagoveshchensk, Russia

Blagoveschensk State Pedagogical University

Blagoveshchensk, Russia

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Baryshnikov S.V.,Blagoveschensk State Pedagogical University | Charnaya E.V.,National Cheng Kung University | Charnaya E.V.,Saint Petersburg State University | Stukova E.V.,Blagoveschensk State Pedagogical University | And 2 more authors.
Ferroelectrics | Year: 2010

Studies of complex permittivity and third harmonic generation were carried out for a Rochelle salt loaded porous alumina film within a temperature range from 80 to 325 K in comparison with studies of Rochelle salt single crystals. Only one peak of real part of permittivity corresponding to the lower (re-entrant) phase transition in confined Rochelle salt was observed which temperature was reduced by 10 K compared to the relevant temperature in bulk. The upper phase transition was shifted beyond the decomposition temperature in agreement with previous findings. The amplitude of the third harmonic which correlates to the emergence of ferroelectricity was found to be enhanced above 245 K till 325 K. The results obtained evidence the strong extension of the ferroelectric phase in confined Rochelle salt due to the decrease and the increase of the lower and upper phase transition temperatures, respectively. The physical nature of such extension is discussed. Copyright © Taylor & Francis Group, LLC.


Baryshnikov S.V.,Blagoveschensk State Pedagogical University | Charnaya E.V.,National Cheng Kung University | Milinskiy A.Y.,Blagoveschensk State Pedagogical University | Shatskaya Y.A.,Blagoveschensk State Pedagogical University | And 2 more authors.
Physica B: Condensed Matter | Year: 2010

Measurements of the linear permittivity and third-order harmonic generation were carried out for KNO3 loaded molecular sieves MCM-41 with pores of 37 and 26 in comparison with bulk potassium nitrate. The samples were warmed up to 423 and 463 K from room temperature. The ferroelectric phase III was shown to occur upon cooling in both nanocomposites after warming till 463 K when it emerges also in bulk KNO3. Nanoconfinement led to the pronounced broadening of the temperature range of ferroelectricity. While under the thermal conditions when phase III does not arise in bulk KNO3, ferroelectricity was found only within pores of 26 . © 2010 Elsevier B.V. All rights reserved.


Charnaya E.V.,National Cheng Kung University | Charnaya E.V.,Saint Petersburg State University | Lee M.K.,National Cheng Kung University | Tien C.,National Cheng Kung University | And 7 more authors.
Journal of Magnetism and Magnetic Materials | Year: 2012

Dc magnetization and ac electric permittivity were measured for the CuO-porous glass nanocomposite made and for pressed powder CuO. Magnetization curves showed a bend between two linear segments for both the nanocomposite and bulk cupric oxide at 230 K evidencing that the temperature of the transition from the paramagnetic into multiferroic phase did not change noticeably under nanoconfinement. Results suggested also a reduction of the temperature of the second transition into the collinear antiferromagnetic phase. ZFC and FC magnetizations were found to bifurcate for the nanocomposite and bulk CuO. The bifurcation was accompanied with peaks on ZFC magnetization. © 2012 Elsevier B.V. All rights reserved.


Letyanina I.A.,Novgorod State University | Smirnova N.N.,Novgorod State University | Markin A.V.,Novgorod State University | Ruchenin V.A.,Novgorod State University | And 3 more authors.
Journal of Thermal Analysis and Calorimetry | Year: 2011

In the present research for the first time, the heat capacity C p 0 of crystalline tetraphenylantimony acetophenoneoxymate Ph4SbONCPhMe has been measured using the methods of precision adiabatic vacuum calorimetry over the range from 6 to 350 K, the standard thermodynamic functions: heat capacity Cp 0 T, enthalpy H°(T) - H°(0), entropy S°(T), and Gibbs function G°(T) - H°(0) have been calculated over the range from T → 0 K to 350 K. Low-temperature (20 K ≤ T ≤ 50 K) heat capacity data have shown a chain-layered structure topology of the compound under study. The energy of combustion of the compound has been determined in the isothermal combustion calorimeter with a stationary bomb. The standard thermodynamic functions of formation of crystalline Ph4SbONCPhMe at 298.15 K have been calculated. The differential scanning calorimetry and thermogravimetric analysis studies have shown the compound melts with decomposition and its melting temperature has been estimated. Thermodynamic properties of Ph 4SbONCPhMe, Ph5Sb and Ph4SbONCPh2 have been compared. © 2011 Akadémiai Kiadó, Budapest, Hungary.


Baryshnikov S.V.,Blagoveschensk State Pedagogical University | Charnaya E.V.,Saint Petersburg State University | Shatskaya Yu.A.,Blagoveschensk State Pedagogical University | Milinskii Yu.A.,Blagoveschensk State Pedagogical University | And 3 more authors.
Bulletin of the Russian Academy of Sciences: Physics | Year: 2011

The results of studying triglycine sulphate (TGS) imbedded into nanoscale silicate matrices (opal matrices and SBA-15) by methods of linear and nonlinear dielectric spectroscopy are presented. The ferro-electric phase transition becomes noticeably smeared out, as compared to that in a single crystal, and its temperature rises, both effects becoming more pronounced with the decrease in pore sizes. © 2011 Allerton Press, Inc.


Borisov B.F.,Saint Petersburg State University | Charnaya E.V.,National Cheng Kung University | Baryshnikov S.V.,Blagoveschensk State Pedagogical University | Pirozerskii A.L.,Saint Petersburg State University | And 4 more authors.
Physics Letters, Section A: General, Atomic and Solid State Physics | Year: 2010

Acoustic studies of a nanocomposite consisted of MCM-41 molecular sieves with nanoparticles of ferroelastic LiCsSO4 within pores were carried out. The critical softening of the transverse ultrasound velocity was observed which evidenced the ferroelastic phase transition in confined particles. The transition was moved to low temperatures compared to that in bulk LiCsSO 4. It is shown that acoustic methods are very suitable to reveal the ferroelastic phase transitions under nanoconfinement. © 2010 Elsevier B.V.


Pirozerski A.L.,Saint Petersburg State University | Charnaya E.V.,Saint Petersburg State University | Baryshnikov S.V.,Blagoveschensk State Pedagogical University | Nedbai A.I.,Saint Petersburg State University | And 5 more authors.
International Journal of Applied Engineering Research | Year: 2016

A modified pulse-phase ultrasonic technique for the measurement of the ultrasound velocity is described. It was applied for studies of the temperature dependence of the longitudinal ultrasound velocity in a nanocomposite MCM-41/LiCsSO4in the temperature range 160-300 K. A local decrease of the velocity with minimum at ~195 K was observed. A qualitative explanation of this anomaly and its connection with the ferroelastic phase transition in the nanoparticles within the pores is given. It is shown that ultrasonic methods are very suitable for studies of the ferroelastic phase transitions in the nanocomposites. © Research India Publications.


Baryshnikov S.V.,Amur State University | Charnaya E.V.,Saint Petersburg State University | Milinskii A.Yu.,Amur State University | Antonov A.A.,Blagoveschensk State Pedagogical University | Bugaev A.S.,Moscow Institute of Physics and Technology
Composites Part B: Engineering | Year: 2015

Dielectric studies were carried out for composite ceramics (BaTiO3)x/(BiFeO3)1-x (0 < x < 1) within a temperature range 23-450°C. Linear permittivity studies at various frequencies showed the emergence of peaks near the temperatures of the ferroelectric phase transition in the BaTiO3 grains and of the antiferromagnetic phase transition in the BiFeO3 grains. The positions of the peaks did not depend visibly on frequency. The permittivity peaks near the antiferromagnetic phase transition shifted to low temperature with increasing the barium titanate fraction which suggests the reduction of the Neel temperature. The decrease in the Neel temperature in the composite ceramics was confirmed by measurements of the temperature dependence of the third harmonic generation. © 2015 Elsevier Ltd. All rights reserved.


Milinskiy A.Y.,Blagoveschensk State Pedagogical University | Baryshnikov S.V.,Blagoveschensk State Pedagogical University | Charnaya E.V.,Saint Petersburg State University
Ferroelectrics | Year: 2016

Ferroelectricity was studied in the nanocomposites consisting of KDP loaded MCM-41 molecular sieves with pore sizes 2.6 and 3.8 nm. The ferroelectric phase transition shifted to high temperature by 0.4 K for the MCM-41 nanocomposite with the pore size 3.8 nm and by 0.8 K for that with the pore size 2.6 nm. © 2016 Taylor & Francis Group, LLC.


PubMed | Blagoveschensk State Pedagogical University
Type: Journal Article | Journal: Journal of physics. Condensed matter : an Institute of Physics journal | Year: 2011

Dielectric studies of molecular sieves MCM-41 filled with K(1-x)Na(x)NO(3) salts (x = 0, 0.05 and 0.10) were carried out and compared with results obtained for their bulk counterparts. The regular increase upon warming of the temperature of the reconstructive phase transition from phase II to phase I with decreasing pore sizes was observed for all x. A thermodynamic model for shifts of reconstructive phase transitions was suggested. Ferroelectric phase III was shown to occur upon cooling in bulk binary salts and for all x in confined geometry under the thermal conditions when phase III does not arise in bulk KNO(3). Ferroelectricity persisted below room temperature in the bulk binary salt with x = 0.10.

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