The intrinsic ⅛ lock-in improper ferroelectric phase in thiourea: dielectric susceptibility and hysteresis loop analysis

Chen, X. K.; Li, G.; Du, Weimin; Cummins, H. Z.

doi:10.1080/00150199208015957

Cited by 5 publications

(4 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…2) agrees perfectly with results of numerous dielectric studies of thiourea published till now [14,16]. The strongest anomaly in permittivity is observed at the phase transition from the ferroelectric phase I.…”

Section: Resultssupporting

confidence: 88%

“…2. Note that the linear permittivity for the thiourea single crystal depended very weakly on frequency in full agreement with results of published studies [16]. In contrast, the frequency dependence was very pronounced for the composite samples.…”

Section: Samples and Experimentssupporting

confidence: 89%

“…The lattice parameters at room temperature are а = 7.65 Å, b = 8.53 Å, с = 5.52 Å. Upon cooling from room temperature, thiourea undergoes the structural phase transition to an incommensurate phase at about 202 K. The spatial modulation is along the b axis [16,17]. In a narrow temperature range near 178 K the structure is commensurate and ferroelectric (phase III).…”

Section: Samples and Experimentsmentioning

confidence: 98%

See 2 more Smart Citations

Dielectric Studies of Thiourea, SС(NH₂)₂, Embedded into Molecular Sieves

2014

View full text Add to dashboard Cite

Studies of temperature dependences of linear permittivity and third harmonic generation were carried out for ferroelectric thiourea, SС(NH 2 ) 2 , particles embedded into molecular sieves SBA-15 and МСМ-41 with pore sizes of 7.5 nm and 4.0 nm, respectively. Temperatures of the ferroelectric phase transition and transition from the incommensurate phase into paraphase were shown to be higher than in bulk thiourea. The shifts of the transitions increased with decreasing pore size. Both phase transitions were strongly diffused. The obtained data evidenced that the third harmonic generation can be used to find temperatures of the diffused ferroelectric transition.

show abstract

Section: Resultssupporting

confidence: 88%

Section: Samples and Experimentssupporting

confidence: 89%

Section: Samples and Experimentsmentioning

confidence: 98%

See 1 more Smart Citation

Dielectric Studies of Thiourea, SС(NH₂)₂, Embedded into Molecular Sieves

2014

View full text Add to dashboard Cite

show abstract

“…Частотная зависимость диэлектриче-ской проницаемости в диапазоне 10 3 −10 6 Hz практиче-ски отсутствует. Температурная зависимость ε ′ , получен-ная для монокристалла, хорошо согласуется с резуль-татами многочисленных диэлектрических исследований тиомочевины, опубликованными ранее [16,19]. Самая сильная аномалия ε ′ (T ), соответствующая фазовому переходу из сегнетоэлектрической фазы I в фазу II, Физика твердого тела, 2017, том 59, вып.…”

Section: результатыunclassified

Исследование фазовых переходов сегнетоэлектрика SС(NH-=SUB=-2-=/SUB=-)-=SUB=-2-=/SUB=- в нанопористых матрицах на основе Al-=SUB=-2-=/SUB=-O-=SUB=-3-=/SUB=-

Милинский¹,

Барышников²,

Antonov³

2017

Физика Твердого Тела

View full text Add to dashboard Cite

Исследованы температурные зависимости линейной диэлектрической проницаемости ε ′ и амплитуды тре-тьей гармоники γ 3ω композиционных материалов, полученных путем внедрения сегнетоэлектрика SС(NH 2 ) 2 в матрицы пористого оксида алюминия Al 2 O 3 с размерами пор 60 и 100 nm. Обнаружено значительное повышение температуры Tc сегнетоэлектрического фазового перехода и температуры Ti фазового перехода из несоразмерной фазы в парафазу. Сдвиги переходов возрастают с уменьшением диаметра пор.

show abstract