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1.
Russian Physics Journal - The temperature dependences of the linear dielectric permittivity ε′ and the third harmonic coefficient γ3ω for nanocomposites obtained by embedding a... 相似文献
2.
A. Yu. Milinskiy E. V. Stukova 《Bulletin of the Russian Academy of Sciences: Physics》2016,80(9):1089-1091
Linear and nonlinear dielectric properties of KIO3 polycrystalline samples are investigated. It is shown that linear dielectric permittivity ε' displays four anomalies corresponding to phase transitions in KIO3. Anomalies of third-harmonic coefficient γ3ω are observed at temperatures of 113, 263, and 345 K, corresponding to phase transitions between KIO3 ferroelectric phases. It is established that the third-harmonic coefficient responsible for the nonlinearity of dielectric properties displays no anomalies during the transition to the paraelectric phase of KIO3 at approximately 485 K. Possible reasons for there being no such anomaly are discussed. 相似文献
3.
Temperature dependences of dielectric constant, amplitude of the third harmonic and heat capacity for the organic ferroelectric of diisopropylammonium iodide (C6H16NI) have been investigated. The measurements were carried out through heating and cooling cycles in the range of 300–400?K. It was found that upon the first heating, only one phase transition occurred without the presence of the ferroelectric phase. For samples preheated over 420?K, two phase transitions at 363 and 378?K appeared in the heating process, and the ferroelectric state was also observed between them. Upon cooling, the ferroelectric phase was detected in the range of lower 361?K and persisted up to room temperature. 相似文献
4.
Uskova N. I. Charnaya E. V. Podorozhkin D. Yu. Baryshnikov S. V. Egorova I. V. Milinskiy A. Yu. 《Physics of the Solid State》2020,62(7):1195-1198
Physics of the Solid State - Room-temperature changes in the structure of a new diisopropylammonium chloride (C6H16ClN, DIPAC) molecular ferroelectric have been investigated by high-resolution... 相似文献
5.
S. V. Baryshnikov E. V. Charnaya A. Yu. Milinskiy Yu. V. Patrushev 《Physics of the Solid State》2013,55(12):2566-2570
This paper reports on a comparative study of phase transitions in nanocomposites made up of KNO3 embedded in 10-μm-thick MCM-41 films with unidirectional pores 4.0 nm in size on an aluminum substrate and of nanocomposites prepared in the form of potassium-nitrate-filled pressed MCM-41 powders with 3.7-nm pores. The temperature dependences of linear permittivity and the amplitude of third harmonic generation have been measured under heating and cooling. The structural transition from phase II to phase I shifts under heating relative to that occurring in bulk KNO3 toward lower temperatures for potassium nitrate in the film and toward higher temperatures for the pressed MCM-41-based nanocomposite. A significant difference has been observed also within the region of existence of ferroelectric phase III. The data obtained suggest that the shifts of phase transition temperatures observed in the conditions of nanoconfinement are influenced markedly not only by pore size and geometry but also by other factors. 相似文献
6.
Hoai Thuong Nguyen S. V. Baryshnikov A. Yu Milinskiy I. V. Egorova E.V. Charnaya 《Phase Transitions》2013,86(10):899-906
ABSTRACTThe present work aims at investigating linear and nonlinear dielectric properties of nanocomposites based on diisopropylammonium bromide (C6H16NBr, DIPAB) embedded into Al2O3 films having honeycomb structure with pores of 100?nm in diameter, and into opal matrices with three-dimensional structure containing pores of 100 and 60?nm. The obtained results indicated the shift of Curie point toward lower temperatures for DIPAB in porous aluminum oxide and the appearance of two phase transitions, detected upon heating and cooling for DIPAB in opal matrices. In addition, a ferroelectric phase was found to form between these two phase transitions without significant change of Curie temperature. 相似文献
7.
S. V. Baryshnikov A. Yu. Milinskiy V. A. Parfenov I. V. Egorova 《Phase Transitions》2018,91(3):293-300
The dielectric studies of diisopropylammonium chloride (DIPAC) nanoparticles embedded into opal and MCM-41 silica matrices are presented. It is shown that the ferroelectric phase transition shifts to low temperatures and broadens for DIPAC within the opal pores compared to bulk. The thermal hysteresis of the transition increases under opal nanoconfinement. No anomalies of the permittivity relevant to the ferroelectric transition are observed for DIPAC within the MCM-41 molecular sieves likely due to formation of the amorphous phase. 相似文献
8.
A. Yu. Milinskiy S. V. Baryshnikov A. A. Antonov 《Bulletin of the Russian Academy of Sciences: Physics》2018,82(3):242-245
Temperature dependences of permittivity ε′ and third harmonic amplitude γ3ω of nanocomposites obtained by embedding ferroelectric SC(NH2)2 in porous alumina films with pore sizes of 60 and 100 nm are studied. A substantial increase in the temperatures of ferroelectric phase transition Tc1 and Tc2 and that of phase transition Ti from incommensurate phase to paraphase are also observed. The temperatures of all phase transitions are found to rise as pore diameters shrink. 相似文献
9.
Uskova N. I. Charnaya E. V. Podorozhkin D. Yu. Baryshnikov S. V. Milinskiy A. Yu. Egorova I. V. Nefedov D. Yu. 《Applied magnetic resonance》2020,51(2):129-134
Applied Magnetic Resonance - The properties of the molecular ferroelectric diisopropylammonium bromide (C6H16BrN, DIPAB) particles embedded into a nanoporous opal matrix were studied by... 相似文献
10.
Russian Physics Journal - The results of studies of the dielectric permittivity ε′ and the third harmonic coefficient γ3ω of a new organic ferroelectric diisopropylammonium... 相似文献