Size Effect in Nanocomposites Based on Molecular Ferroelectric Diisopropylammonium Bromide

Барышников, С. В.; Milinskii, A. Yu.; Charnaya, E. V.; Егорова, И. В.

doi:10.1134/s1063783419020057

Cited by 11 publications

(4 citation statements)

References 22 publications

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“…The changes in phase transition temperature for DIPAB inclusion (see table 1) can be compared with similar results obtained for Rochelle salt and sodium nitrite introduced into porous alumina [8,[17][18][19][20][23][24][25]. For Rochelle salt in porous Al 2 O 3 , the expansion of ferroelectric phase was detected with a simultaneous occurrence of a decrease and increase in the temperatures of the lower and upper structural transitions, respectively [23][24][25].…”

Section: Resultssupporting

confidence: 68%

“…Over inorganic ferroelectrics, organic ferroelectrics have several advantages as light weight and environmental friendliness due to the absence of heavy metals in their structures, making them potential for applications in organic microelectronics. The size effects in ferroelectrics belonging to the diisopropylammonium family have been studied in several papers [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

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Dielectric properties of an organic ferroelectric of bromide diisopropylammonium embedded into the pores of nanosized Al₂O₃ films

Milinskiy¹,

Барышников²,

Charnaya³

et al. 2019

J. Phys.: Condens. Matter

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The study presents experimental results for investigating linear and nonlinear dielectric properties of nanocomposites based on bromide diisopropylammonium (C6H16NBr, DIPAB) and aluminum oxide films (Al2O3) with pore diameter of 330, 100 and 60 nm. It was indicated that the phase transition was blurred and shifted toward lower temperatures. This anomaly became more significant with decreasing pore size. The reduction of phase transition temperature in the nanocomposites, containing DIPAB, was consistent with theoretical models for the influence of size effects on the structural phase transition.

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Section: Resultssupporting

confidence: 68%

Section: Introductionmentioning

confidence: 99%

Dielectric properties of an organic ferroelectric of bromide diisopropylammonium embedded into the pores of nanosized Al₂O₃ films

Milinskiy¹,

Барышников²,

Charnaya³

et al. 2019

J. Phys.: Condens. Matter

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“…В связи с перспективами практического использования новых органических сегнетоэлектриков, значительный интерес вызывают исследования влияния понижения размеров на их свойства. Фазовые переходы в наноструктурированных сегнетоэлектриках DIPAС и DIPAB изучались в [5][6][7][8]. Были обнаружены сдвиги температур и изменение последовательности сегнетоэлектрических фазовых переходов.…”

Section: Introductionunclassified

Влияние Наноконфайнмента На Кинетику Фазовых Переходов В Органическом Сегнетоэлектрике DIPAI

Милинский¹,

Барышников²,

Чарная³

et al. 2020

Физика Твердого Тела

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The results of studying the linear and nonlinear dielectric properties of a new organic ferroelectric diisopropylammonium iodide (DIPAI), embedded in porous alumina films, in comparison with bulk DIPAI, are presented. It was found, for DIPAI in pores 300 and 60 nm in diameter the ferroelectric phase is formed in the heating and cooling modes in the temperature interval between two structural phase transitions above room temperature. No noticeable temperature hysteresis was observed for both phase transitions. It was shown that the boundaries of the intermediate polar phase for nanostructured DIPAI shift to low temperatures with decreasing pore size. For bulk DIPAI, two structural transitions were revealed during heating with the formation of an intermediate polar phase and only one transition during cooling, below which ferroelectricity occurred. The temperature of this transition was much lower than the corresponding temperature during heating. It is assumed that the observed differences in phase transitions for DIPAI in pores and bulk DIPAI are associated with acceleration of the phase transitions kinetics under conditions of nanoconfinement.

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“…Owing to their promising ferroelectric characteristics, DIPAC and DIPAB were extensively studied by different techniques, including dielectric spectroscopy and x-ray diffraction [4][5][6][7][8][9][10][11][12][13]. Recently a thin film of DIPAB [14], DIPAB 2D monolayer crystal [15], and nanocomposites with DIPAC and DIPAB nanoparticles were also fabricated and studied [16,17]. However, no nuclear resonance studies of these ferroelectrics were performed until now except for 14 N NQR below the ferroelectric phase transition and proton NMR measurements within a large temperature range including the transition temper ature in DIPAC [18].…”

Section: Introductionmentioning

confidence: 99%

¹³C NMR of DIPAC and DIPAB organic ferroelectrics

Uskova

Charnaya

Podorozhkin

et al. 2019

J. Phys.: Condens. Matter

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The diisopropylammonium chloride (C 6 H 16 ClN, DIPAC) and diisopropylammonium bromide (C 6 H 16 BrN, DIPAB) molecular crystals are recently discovered ferroelectrics with sufficiently high spontaneous polarization and Curie temperature. We performed first studies of these crystals by 13 C NMR. CP MAS spectra were collected within large temperature ranges covering the Curie points. The reconstructive phase transition from the initial orthorhombic P2 1 2 1 2 1 structure of DIPAB to the monoclinic ferroelectric P2 1 structure leads to an abrupt alteration in the 13 C spectrum. The 13 C spectra for DIPAC and DIPAB in the ferroelectric P2 1 phase are quite similar with four lines at lower frequencies, which correspond to the CH 3 groups, and two lines with close chemical shifts, which correspond to two CH groups. The transition into the paraphase leads to gradual reduction of the interline distances in the low-frequency quadruplet and in the doublet. The step-like changes in the interline frequency shifts at this transition indicating its first order. The analysis of the spectrum evolution in the paraphase shows that only a CH group lays in the reflection plane above the P2 1 → P2 1 /m transition, while the second CH group only moves closer to the reflection plane upon further heating.

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Size Effect in Nanocomposites Based on Molecular Ferroelectric Diisopropylammonium Bromide

Cited by 11 publications

References 22 publications

Dielectric properties of an organic ferroelectric of bromide diisopropylammonium embedded into the pores of nanosized Al₂O₃ films

Dielectric properties of an organic ferroelectric of bromide diisopropylammonium embedded into the pores of nanosized Al₂O₃ films

Влияние Наноконфайнмента На Кинетику Фазовых Переходов В Органическом Сегнетоэлектрике DIPAI

¹³C NMR of DIPAC and DIPAB organic ferroelectrics

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Size Effect in Nanocomposites Based on Molecular Ferroelectric Diisopropylammonium Bromide

Cited by 11 publications

References 22 publications

Dielectric properties of an organic ferroelectric of bromide diisopropylammonium embedded into the pores of nanosized Al2O3 films

Dielectric properties of an organic ferroelectric of bromide diisopropylammonium embedded into the pores of nanosized Al2O3 films

Влияние Наноконфайнмента На Кинетику Фазовых Переходов В Органическом Сегнетоэлектрике DIPAI

13C NMR of DIPAC and DIPAB organic ferroelectrics

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Dielectric properties of an organic ferroelectric of bromide diisopropylammonium embedded into the pores of nanosized Al₂O₃ films

Dielectric properties of an organic ferroelectric of bromide diisopropylammonium embedded into the pores of nanosized Al₂O₃ films

¹³C NMR of DIPAC and DIPAB organic ferroelectrics