Grain growth in BaTiO3 ceramics assisted by an intergranular glass film

Nien, Chih-Hung; Hsieh, C.-C.; Hong, J.K.; Lu, Hong-Yang

doi:10.1016/j.ceramint.2013.06.103

Cited by 3 publications

(3 citation statements)

References 28 publications

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“…Those samples sintered at 960 ○ C had a homogeneous microstructure while obvious abnormal growth appeared in the grains sintered at 980 ○ C. It had been reported that the abnormal growth grains with perovskite structure often had interweaving feature which was due to a crystallographic twin or penetration twin. 25,26 In addition, the trapped small grains were observed around large grain boundary in Figs. 1(f)-1(i).…”

Section: Resultsmentioning

confidence: 87%

Large electro-strain signal of the BNT–BT–KNN lead-free piezoelectric ceramics with CuO doping

Zhao

Dai

2019

J. Adv. Dielect.

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This paper investigates a system of 0.93[Formula: see text][Formula: see text]TiO3–0.06BaTiO3–0.01[Formula: see text][Formula: see text]NbO3–[Formula: see text]CuO (BNT–BT–KNN–[Formula: see text]CuO, [Formula: see text][Formula: see text]mol.%) ceramics, which were fabricated by the conventional solid-state process through the granulation of vacuum freeze drier. The results show that the CuO doping made a significant enhancement on the piezoelectric properties of the BNT–BT–KNN ceramics. With the doping of CuO, the transition temperature between ferroelectric phase and ergodic relaxor state is reduced to near room temperature, resulting in pinched [Formula: see text]–[Formula: see text] loops and “sprout” shape [Formula: see text]–[Formula: see text] curves. For the composition with [Formula: see text], a high unipolar strain of 0.39% under 5[Formula: see text]kV/mm contributes a large [Formula: see text][Formula: see text]pm/V at room temperature, which is competitive with the other BNT-based ceramics.

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Section: Resultsmentioning

confidence: 87%

Large electro-strain signal of the BNT–BT–KNN lead-free piezoelectric ceramics with CuO doping

Zhao

Dai

2019

J. Adv. Dielect.

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“…The statistical analysis of the remnant polarization indicates that the improved remnant polarization is dependent on the phase fraction ξ and lattice distortion. According to phenomenological theory, the improved ferroelectric polarization can be ascribed to the low-symmetry phase and underlying phase boundary polarization . The occupation of the orthogonal phase fraction reaches the largest level at x = 0.5, while the remnant polarization deteriorates severely.…”

Section: Resultsmentioning

confidence: 99%

“…According to phenomenological theory, the improved ferroelectric polarization can be ascribed to the low-symmetry phase and underlying phase boundary polarization. 19 The occupation of the orthogonal phase fraction reaches the largest level at x = 0.5, while the remnant polarization deteriorates severely. The minimum distortion parameters, such as c/a and c/b, are obtained, which indicate minimal lattice distortion and are consistent with the above results.…”

Section: Grain Boundary Derived Ferroelectric and Dielectricmentioning

confidence: 95%

Microscopic Insight into Structure Determination of Ferroelectric Photovoltaics in Aurivillius-Phase Ferroelectrics

Zhang

Bao

et al. 2023

J. Phys. Chem. C

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Recently, a high open-circuit voltage of the ferroelectric photovoltaic effect driven by the polar order of the ferroelectrics has been intensively reported in the Aurivillius-phase perovskite structure. However, the factors limiting the ferroelectric photovoltaic effect are not clearly understood. Here, we observed a correlation between the polar phase fraction and ferroelectric photovoltage in Sr 1−x Ba x Bi 4 Ti 4 O 15 polycrystalline films, where the output intensity was regulated by the change in the phase fraction parameter ξ (I4 1 am/A2 1 am tetragonal−orthogonal phase), and lattice distortion was caused by the different dopant concentrations in the range of (x = 0, 0.2, 0.5, 0.8, and 1.0). The ferroelectric photovoltaic effect is outstanding in the SrBi 4 Ti 4 O 15 films, which confirms that the polar phase fraction plays a crucial role in the photocurrent intensity. The photovoltaic external efficiency can reach 28% at the spectrum response peak of 340 nm, and we also constructed a function relation to describe the intensity. These results indicate that the ferroelectric polarization and bandgap are significantly related to the phase fraction evolution. Further, our experimental results not only confirm the speculated mechanism of enhanced electron−hole separation in ferroelectrics but also clarify the unsymmetrical dispersion of photoelectrons as a key factor, which offers an opportunity to understand its nature.

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