Effect of sintering temperature on dielectric properties of barium titanate ceramics and composite

Malyshkina, O. V.; Shishkov, G. S.; Martyanov, A. A.; Иванова, А. И.

doi:10.3897/j.moem.6.4.65576

Cited by 4 publications

(6 citation statements)

References 12 publications

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“…In the “as-sintered” state, the 1.0% Cu-doped BTO yields the highest polarization (∼9.3 μC/cm 2 ) and strain (∼0.1%) when compared to the 1.0% Fe and Co-doped BTO, with polarizations of 4.8 and 3.7 μC/cm 2 and strains of 0.03% and 0.025%, respectively. In comparison, undoped BTO sintered at similar conditions yield polarizations between 15 and 18 μC/cm 2 ( Tan et al, 2015 ; Malyshkina et al, 2020 ). Additionally, Figure 2B shows that all three dopants yielded little to no negative strain, showing recoverable strain across each dopant.…”

Section: Resultsmentioning

confidence: 98%

“…With respect to the

of the three samples, it is important to note that the accepted value of T c for undoped BTO lies between 120°C and 135°C, with samples processed under comparable conditions yielding Curie temperatures ranging between 120°C and 130°C ( Tan et al, 2015 ; Malyshkina et al, 2020 ). It is generally expected that doping BTO with these cations or ones of similar valency will decrease the T c due to oxygen vacancy formation ( Tewatia et al, 2021 ).…”

Section: Resultsmentioning

confidence: 99%

“…Upon electron dispersive spectroscopy (EDS) analysis, there was a lack of apparent dopant segregation into grain boundaries or secondary phases in the cross-sections of the doped samples. Undoped BTO sintered under similar conditions have grains averaging approximately 4 µm in diameter, the size of which is very dependent on the sintering temperature and time ( Hoshina et al, 2008 ; Tan et al, 2015 ; Malyshkina et al, 2020 ). The choice of dopant itself is likely driving the observed differences in grain sizes between the three samples, since they were sintered intentionally under the same conditions to achieve similar high density (>91%) rather than optimizing the sintering conditions to create a specific grain size.…”

Section: Resultsmentioning

confidence: 99%

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Effect of sub-micron grains and defect-dipole interactions on dielectric properties of iron, cobalt, and copper doped barium titanate ceramics

Mills,

Patterson,

Staruch

2023

Front. Chem.

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Introduction: Dilutely doped ferroelectric materials are of interest, as engineering these materials by introducing point defects via doping often leads to unique behavior not otherwise achievable in the undoped material. For example, B-site doping with transition metals in barium titanate (BaTiO3, or BTO) creates defect dipoles via oxygen vacancies leading enhanced polarization, strain, and the ability to tune dielectric properties. Though defect dipoles should lead to dielectric property enhancements, the effect of grain size in polycrystalline ferroelectrics such as BTO plays a significant role in those properties as well.Methods: Herein, doped BTO with 1.0% copper (Cu), iron (Fe), or cobalt (Co) was synthesized using traditional solid-state processing to observe the contribution of both defect-dipole formation and grain size on the ferroelectric and dielectric properties.Results and discussion: 1.0% Cu doped BTO showed the highest polarization and strain (9.3 μC/cm2 and 0.1%, respectively) of the three doped BTO samples. While some results, such as the aforementioned electrical properties of the 1.0% Cu doped BTO can be explained by the strong chemical driving force of the Cu atoms to form defect dipoles with oxygen vacancies and copper’s consistent +2 valency leading to stable defect-dipole formation (versus the readily mixed valency states of Fe and Co at +2/+3), other properties cannot. For instance, all three Tc values should fall below that of undoped BTO (typically 120°C–135°C), but the Tc of 1.0% Cu BTO actually exceeds that range (139.4°C). Data presented on the average grain size and distribution of grain sizes provides insight allowing us to decouple the effect of defect dipoles and the effect of grain size on properties such as Tc, where the 1.0% Cu BTO was shown to possess the largest overall grains, leading to its increase in Tc.Conclusion/future work: Overall, the 1% Cu BTO possessed the highest polarization, strain, and Tc and is a promising dopant for engineering the performance of the material. This work emphasizes the challenge of extricating one effect (such as defect-dipole formation) from another (grain size modification) inherent to doping polycrystalline BTO.

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Section: Resultsmentioning

confidence: 98%

“…With respect to the

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Effect of sub-micron grains and defect-dipole interactions on dielectric properties of iron, cobalt, and copper doped barium titanate ceramics

Mills,

Patterson,

Staruch

2023

Front. Chem.

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“…Both cylinder-shape and disk-shaped samples (five samples of each type of ceramic were made) were produced for the characterization at 10 and 15 kN m −2 units. Finally, the samples of different compositions were sintered in the presence of air at 1250 °C for 4 h [53][54][55][56].…”

Section: Experimental Details 21 Sample Preparationmentioning

confidence: 99%

Giant effect on structural, magnetic, electrical, and optical properties of lead-free Ba_0.6Sr_0.4Ti_1-xAl_xO₃ ceramics via Sr and Al Co-doping engineering

Mahmud

Ahamed

Khan

2022

Mater. Res. Express

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In this research, structural, magnetic, electrical, and optical properties of Al3+ substituted Ba0.6Sr0.4Ti1-xAlxO3 ceramics (where x = 0.00 to 0.20) have been investigated and discussed. The ceramic samples have been successfully synthesized by the conventional solid-state reaction method. The crystallinity of the prepared samples has been confirmed by X-ray peak broadening techniques such as the Williamson Hall (W-H) plot technique and the Scherrer method. The lattice constant "a", showing a significant drop as Al concentration increases, varies from 3.9420A to 3.9210A. The FTIR spectrum revealed a prominent peak between 435 cm−1 to 540 cm−1, without showing any secondary phase. Raman spectroscopic analysis showed that the prepared samples are in cubic phase with no phase transition. The shifting of a dominating peak in Raman at 580 cm-1 is due to the development of AlTi defects. VSM analysis at room temperature showed the ferromagnetic characteristics of all the samples. The highest value of the anisotropic constant (Ka~39.933 emu/cm3) has been seen at x=0.10. The real component of initial permeability is almost constant for the frequency range of about 75 MHz, and above this frequency range, it quickly reduces. At the high-frequency range, the prepared samples show an excellent relative quality factor due to the low dielectric loss, notably when x = 0.05. The prepared perovskites exhibited minimum eddy current loss characteristics due to the increment of AC resistivity at x=0.20. UV–visible spectroscopy shows a significant change in the energy bandgap from 3.23 eV to 3.04 eV with the doping concentrations.

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“…В последнее десятилетие были предприняты значительные усилия по исследованию бессвинцовых керамических материалов на основе ниобатов и титанатов щелочных и щелочноземельных металлов [1][2][3][4][5][6][7]. В улучшении свойств этих материалов имеется значительный прогресс, тем не менее, одним из основных недостатков этих систем является их температурные ограничения.…”

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

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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.

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Effect of sintering temperature on dielectric properties of barium titanate ceramics and composite

Cited by 4 publications

References 12 publications

Effect of sub-micron grains and defect-dipole interactions on dielectric properties of iron, cobalt, and copper doped barium titanate ceramics

Effect of sub-micron grains and defect-dipole interactions on dielectric properties of iron, cobalt, and copper doped barium titanate ceramics

Giant effect on structural, magnetic, electrical, and optical properties of lead-free Ba_0.6Sr_0.4Ti_1-xAl_xO₃ ceramics via Sr and Al Co-doping engineering

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=-

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Effect of sintering temperature on dielectric properties of barium titanate ceramics and composite

Cited by 4 publications

References 12 publications

Effect of sub-micron grains and defect-dipole interactions on dielectric properties of iron, cobalt, and copper doped barium titanate ceramics

Effect of sub-micron grains and defect-dipole interactions on dielectric properties of iron, cobalt, and copper doped barium titanate ceramics

Giant effect on structural, magnetic, electrical, and optical properties of lead-free Ba0.6Sr0.4Ti1-xAlxO3 ceramics via Sr and Al Co-doping engineering

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=-

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Giant effect on structural, magnetic, electrical, and optical properties of lead-free Ba_0.6Sr_0.4Ti_1-xAl_xO₃ ceramics via Sr and Al Co-doping engineering