Investigation of the electrocaloric effect in strontium barium niobate (SBN) ceramics with rare-earth dopants

Es’kov, A. V.; Anokhin, A. S.; Bui, Minh Tuan; Pakhomov, O. V.; Семенов, А. А.; Belyavskiy, P. Yu; Устинов, А. Б.

doi:10.1088/1742-6596/1038/1/012115

Cited by 3 publications

(3 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Согласно [10], ионы K занимают в структуре TTB позиции ионов Ba, и их вклад в дополнительный (по сравнению с беспримесной керамикой CBN30) дипольный момент незначителен. Ион Li, благодаря его малому радиусу, может занимать вакантные треугольные каналы в структуре TTB [8], что, по всей видимости, приводит к созданию дополнительного смещения зарядовых состояний в элементарной ячейке, и, как следствие к увеличению макроскопической переключаемой поляризации.…”

Section: заключениеunclassified

“…В последнее время все большее внимание привлекают соединения со структурой тетрагональных вольфрамовых бронз (TTB) [8][9][10][11], поскольку их общая формула, имеющая вид: A1 2 A2 4 C 4 B 10 O 30 , дает большие возмож-ности в изменении структуры и улучшению пьезоэлектрических и пироэлектрических свойств. Наиболее исследуемой является керамика на основе ниобата бариястронция (SBN), поскольку увеличение концентрации стронция усиливает сегнетоэлектрические свойства в этой керамике.…”

Section: Introductionunclassified

See 1 more Smart Citation

Процессы переключения в керамике твердых растворов на основе Ca-=SUB=-0.3-=/SUB=-Ba-=SUB=-0.7-=/SUB=-Nb-=SUB=-2-=/SUB=-O-=SUB=-6-=/SUB=-

Гусева,

Малышкина

2023

Физика Твердого Тела

View full text Add to dashboard Cite

In this work, ceramic samples with a structure of the type of tetragonal tungsten bronzes, composition Са0.3Ba0.7Nb2O6 (CBN30) pure and with modifying additives SrTiO3, KTaO3 or LiTaO3 (5 mass %) were studied by the oscillographic method. It is shown that the introduction of modifying additives into CBN30 ceramics leads to an increase in the reversal polarization and to a decrease in dielectric losses, both at room temperature and at high temperatures. The introduction of LiTaO3 impurity into the CBN30 composition leads to the greatest increase in the reversal polarization. In contrast to ceramics based on lead zirconate titanate, which have a perovskite type structure, the introduction of SrTiO3 into CBN30 (having the structure of tetragonal tungsten bronzes) does not significantly improve the ferroelectric properties. It has been found that at temperatures above 100 °C for pure CBN30 ceramics, above 165 °C for CBN30 + 5% SrTiO3 and CBN30 + 5% KTaO3, and above 200 оС for CBN30 + 5% LiTaO3, there is a strong increase in dielectric losses. The contribution of dielectric losses to switching processes makes it impossible to determine the temperature of the ferroelectric phase transition for solid solutions based on CBN30 from the temperature dependences of dielectric hysteresis loops.

show abstract

Section: заключениеunclassified

Section: Introductionunclassified

Процессы переключения в керамике твердых растворов на основе Ca-=SUB=-0.3-=/SUB=-Ba-=SUB=-0.7-=/SUB=-Nb-=SUB=-2-=/SUB=-O-=SUB=-6-=/SUB=-

Гусева,

Малышкина

2023

Физика Твердого Тела

View full text Add to dashboard Cite

show abstract

“…Наиболее изученным из данного класса материалов является кристалл ниобата бария−стронция (SBN), в связи с этим большинство работ по керамикам на основе TTB также посвящено различным модификациям материала SBN [10][11][12][13]. В то же время, одним из недостатков для практического применения SBN является его низкая температура фазового перехода (менее 100 • C).…”

Section: Introductionunclassified

Влияние модификаторов SrTiO-=SUB=-3-=/SUB=-, KTaO-=SUB=-3-=/SUB=- и LiTaO-=SUB=-3-=/SUB=- на диэлектрические свойства керамики Ca-=SUB=-0.3-=/SUB=-Ba-=SUB=-0.7-=/SUB=-Nb-=SUB=-2-=/SUB=-O-=SUB=-6-=/SUB=-

Малышкина¹,

Гусева²,

Митченко³

et al. 2022

Физика Твердого Тела

View full text Add to dashboard Cite

Using the method of solid-phase synthesis, we obtained ceramic samples with a structure like tetragonal tungsten bronzes, pure Ca0.3Ba0.7Nb2O6 (CBN30) and with modifying additives SrTiO3, KTaO3, or LiTaO3. The dispersion of the permittivity in the frequency range from 1 Hz to 10 MHz, the temperature dependences of the permittivity (in the given frequency range) and the pyroelectric coefficient are studied. It is shown that if the introduction of the LiTaO3 impurity into the composition of CBN30 destabilizes the dielectric characteristics at frequencies above 100 kHz, then the SrTiO3 impurity increases both the permittivity and the pyroelectric coefficient, significantly reducing dielectric losses at low (1 – 10 Hz) frequencies. At the same time, both of these impurities (SrTiO3 and LiTaO3) lead to sample depolarization during heating above 150°C, while the KTaO3 impurity, which slightly increases the permittivity and pyroelectric coefficient, does not affect the stability of the polarized state during heating up to higher temperatures.

show abstract

Electrocaloric effect of alkali co-substituted Sr0.6Ba0.4Nb2O6 ceramics

Kurnia

Emriadi

Mufti

et al. 2020

Journal of Alloys and Compounds

View full text Add to dashboard Cite

We have investigated the electrocaloric properties of K + and Na + co-substituted Sr 0.6 Ba 0.4 Nb 2 O 6 (SBN) ceramics using the indirect method. Tetragonal tungsten bronze (K 0.5 Na 0.5 ) 2x (Sr 0.6 Ba 0.4 ) 5-x Nb 10 O 30 (KNSBN) with x = 0.24 was synthesized using dual-step sintering. Despite the low amount, K + and Na + co-substitution resulted in normal ferroelectric behaviour, showing no significant shift in the dielectric maximum temperature of 111°C with increasing frequency. Maximum electrocaloric temperature change (ΔT) of 0.3 K was observed at an electric field of 30 kV/cm (ΔE) yielding the largest electrocaloric responsivity (ΔT/ΔE) among SBN based ceramics. This relatively large value is in agreement with the larger pyroelectric coefficient of KNSBN compared to SBN based ceramics.

show abstract

Investigation of the electrocaloric effect in strontium barium niobate (SBN) ceramics with rare-earth dopants

Cited by 3 publications

References 4 publications

Процессы переключения в керамике твердых растворов на основе Ca-=SUB=-0.3-=/SUB=-Ba-=SUB=-0.7-=/SUB=-Nb-=SUB=-2-=/SUB=-O-=SUB=-6-=/SUB=-

Процессы переключения в керамике твердых растворов на основе Ca-=SUB=-0.3-=/SUB=-Ba-=SUB=-0.7-=/SUB=-Nb-=SUB=-2-=/SUB=-O-=SUB=-6-=/SUB=-

Влияние модификаторов SrTiO-=SUB=-3-=/SUB=-, KTaO-=SUB=-3-=/SUB=- и LiTaO-=SUB=-3-=/SUB=- на диэлектрические свойства керамики Ca-=SUB=-0.3-=/SUB=-Ba-=SUB=-0.7-=/SUB=-Nb-=SUB=-2-=/SUB=-O-=SUB=-6-=/SUB=-

Electrocaloric effect of alkali co-substituted Sr0.6Ba0.4Nb2O6 ceramics

Contact Info

Product

Resources

About