Effect of Sintering Temperature on the Ferroelectric Properties and the Electro-caloric Effect in Barium-Titanate Ceramics

Kim, Bit Chan; Chae, Ki‐Woong; Cheon, Chae Il

doi:10.3938/jkps.76.226

Cited by 11 publications

(22 citation statements)

References 33 publications

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“…Для получения наибольшего значения величины ЭКЭ следует получать зерна примерно одинаковых размеров. Полученное в эксперименте максимальное значение ЭКЭ для керамики титаната бария при комнатной температуре, равное 0.42 K, превосходит ранее известные [6][7][8][9]. Этот результат показывает превосходство метода двуступенчатого синтеза.…”

Section: заключениеunclassified

“…Вблизи фазовых переходов кристаллический BaTiO 3 обладает значительным ЭКЭ, достигающим 1.6 K при не очень больших напряжениях в 1 MV/m [5]. Для керамики ЭКЭ несколько меньше и составляет 1.3 K при напряжении 2 MV/m [6]. При комнатных температурах, где титанат бария испытывает фазовый переход от тетрагональной к орторомбической фазе, ЭКЭ весьма мал.…”

Section: Introductionunclassified

“…Наибольшее изменение температуры при ЭКЭ в этом температурном диапазоне примерно в 4−5 раз меньше, чем в окрестности температуры Кюри-Вейсса. Так, при электрическом поле 2 MV/m величина T не превышает 0.22 K по данным [7] и 0.1 K по данным [6,8,9].…”

Section: Introductionunclassified

“…Исследование микро-и нанокристаллических керамик показывает сильную зависимость их физических свойств от условий синтеза и размера зерен [6,8,9,12,[14][15][16]. Изменение температуры синтеза влияет не только на размеры зерен, но и на их форму, распределение, плотность керамики, пористость.…”

Section: Introductionunclassified

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Влияние Температуры Обжига На Размер Зерен И Электрокалорический Эффект Керамики Титаната Бария

Старков¹,

Анохин²,

Мыльников³

et al. 2022

Физика Твердого Тела

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A theoretical study of the polarization distribution and mechanical stresses in a ferroelectric ball located in an unlimited dielectric space has been carried out. The ball is covered with a dielectric and air shell. The external electric field far from the ball is assumed to be uniform. The polarization in the ball satisfies the nonlinear Landau-Ginzburg equation, which takes into account the presence of electrostriction. It is also assumed that for a small ball, the effect of local elastic stresses on polarization can be replaced by their homogenized value over the volume of the ball. Under this assumption, the distribution of the stress and the electric field can be obtained both in the ball and outside it. The dependence of the Curie-Weiss temperature on the radius of the ball is derived. The resulting solution is used to simulate the properties of microgranular ceramics. Along with the developed theoretical model, a series of experiments was carried out to measure the temperature dependence dielectric constant and the electrocaloric effect (ECE) for BaTiO$_3$ ceramics synthesized at different temperatures. The change in temperature during ECE was measured by direct methods. The greatest value of the ECE was achieved for ceramics synthesized at 1350℃. The magnitude of the change in temperature with a change in the electric field by 2mV/m was ΔT=0.42K. The observed experimental results demonstrate the possibility of using the theoretical four-phase model of ceramics to predict the dependence of the properties of ceramics on the sintering temperature.

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Section: заключениеunclassified

Section: Introductionunclassified

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Влияние Температуры Обжига На Размер Зерен И Электрокалорический Эффект Керамики Титаната Бария

Старков¹,

Анохин²,

Мыльников³

et al. 2022

Физика Твердого Тела

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“…Several other authors obtained BT using spark plasma sintering (SPS). [19][20][21] Some authors reported that sintering of BT below the eutectic temperature, approximately 1320 °C, favours the growth of the {111} faceted twin grains making them giant in a finely grained matrix 22,23 . This report makes a quenched sintering plausible, which avoids this temperature range on heating and cooling of the sample.…”

Section: Introductionmentioning

confidence: 99%

Uncovering the symmetry of the induced ferroelectric phase transformation in polycrystalline barium titanate

Silva

Lee

Petrick

et al. 2021

Journal of Applied Physics

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Microstructural design is a widespread approach to tailor the properties of functional materials, with the size effect being an effective constraint that modifies physical phenomena. In this work, we investigate the grain size effect on the properties and the electric field-induced phase transformation behaviour in barium titanate. A broad range of unimodal average grain size distribution between 0.4 µm and 15 µm were successfully sintered avoiding abnormal grain growth. Samples with a grain size close to the range of 1 to 2 µm, balancing microstructural strain, presence and mobility of domain walls to allow the field induced crystal phase transformation, showed optimal electromechanical and dielectric properties. By means of in situ high energy X-ray diffraction and a high-resolution multianalyser detector we distinguish and quantify a tetragonal-orthorhombic phase transformation induced by an electric field, providing unambiguous proof of this induced phase transformation. These results contribute to the understanding of fundamental questions about the piezoelectric effect in barium titanate and consequently other similar systems.

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A Very Low Temperature Growth of BaTiO₃ Nanoparticles by Sol‐Hydrothermal Method

Dushyant

Kumar

et al. 2022

Physica Status Solidi (a)

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Low‐temperature intercessions are the most proficient technique to control the particle size in the nanometres range with low agglomeration. Herein, BaTiO3 (BT) nanoparticles (NPs) are prepared at low temperatures by using the sol‐hydrothermal technique. An X‐ray diffraction (XRD) pattern of the powder signifies the pure tetragonal phase, and the average crystallite size (43.2 nm) is calculated using different methods: Scherrer's, uniform deformation model (UDM), uniform stress deformation model (USDM), and uniform deformation energy density model (UDEDM) analysis, and the structure is refined by Rietveld refinement method with a good fit value (χ2 = 1.66). Spherical and uniform surface morphology is counted up for BT NPs. Under suitable conditions, BT NPs can be prepared with an average particle size of ≈115 ± 10 nm. However, after sintering, the average grain size (335 ± 10 nm) of the BaTiO3 nanopowder is found to increase with dense grain boundaries. The dielectric behavior of the sample is analyzed with the variation of frequency at different temperatures. The effect of grain and grain boundary on the electrical properties of the material is also investigated by using complex impedance spectroscopy (CIS).

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Effect of Sintering Temperature on the Ferroelectric Properties and the Electro-caloric Effect in Barium-Titanate Ceramics

Cited by 11 publications

References 33 publications

Влияние Температуры Обжига На Размер Зерен И Электрокалорический Эффект Керамики Титаната Бария

Влияние Температуры Обжига На Размер Зерен И Электрокалорический Эффект Керамики Титаната Бария

Uncovering the symmetry of the induced ferroelectric phase transformation in polycrystalline barium titanate

A Very Low Temperature Growth of BaTiO₃ Nanoparticles by Sol‐Hydrothermal Method

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Effect of Sintering Temperature on the Ferroelectric Properties and the Electro-caloric Effect in Barium-Titanate Ceramics

Cited by 11 publications

References 33 publications

Влияние Температуры Обжига На Размер Зерен И Электрокалорический Эффект Керамики Титаната Бария

Влияние Температуры Обжига На Размер Зерен И Электрокалорический Эффект Керамики Титаната Бария

Uncovering the symmetry of the induced ferroelectric phase transformation in polycrystalline barium titanate

A Very Low Temperature Growth of BaTiO3 Nanoparticles by Sol‐Hydrothermal Method

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A Very Low Temperature Growth of BaTiO₃ Nanoparticles by Sol‐Hydrothermal Method