Electrical and Piezoelectric Studies of (Na1-xKx)1/2Bi1/2TiO3

Rao, P. Vijaya Bhaskar; Sankaram, T. Bhima

doi:10.1080/10584587.2010.503803

Cited by 8 publications

(3 citation statements)

References 18 publications

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“…29 Consequently, there is a reduction in the overall polarization, resulting in a mismatch in polarization at the nanoscale level. [30][31][32] The P max is reduced from 55.6 µC/cm 2 to 9.1 µC/cm 2 , and the P-E loop becomes progressively narrower as entropy increases. Figure 5D demonstrates that the polarization does not reach saturation at 100 kV/cm.…”

Section: Resultsmentioning

confidence: 99%

“…The substitution of Zr 4+ , Sn 4+ , and Hf 4+ in high‐entropy NKBT ceramics disrupts the long‐range ferroelectric order, evident in the weakening of the maximum polarization ( P max ) throughout the process of increasing entropy 29 . Consequently, there is a reduction in the overall polarization, resulting in a mismatch in polarization at the nanoscale level 30–32 . The P max is reduced from 55.6 µC/cm 2 to 9.1 µC/cm 2 , and the P – E loop becomes progressively narrower as entropy increases.…”

Section: Resultsmentioning

confidence: 99%

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High‐entropy strategies boosting dielectric temperature stability in (Na_0.4K_0.1Bi_0.5)TiO₃ ceramics

Meng,

Zhang,

Huang

et al. 2024

J Am Ceram Soc.

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Utilizing a high‐entropy strategy, we propose a novel approach for synthesizing (Na0.4K0.1Bi0.5)TiO3 (NKBT)‐based ceramics endowed with exceptional dielectric stability at elevated temperatures. The high‐entropy effect induces a random tilt in the oxygen octahedra of NKBT ceramics, leading to a broad dielectric response characterized by diffuse phase transitions. By weakening the dielectric abnormal peak at Ts of BNT, the dielectric stability of high‐entropy NKBT ceramics is significantly enhanced. Notably, at 100 kHz, the temperature stability range of (Na0.4K0.1Bi0.5)(Ti0.65Zr0.1Sn0.15Hf0.1)O3, synthesized through the traditional solid reaction method, reaches an impressive 311°C, surpassing undoped NKBT by 257%. This significant enhancement underscores the feasibility of our high‐entropy strategy in improving dielectric performance. Our work demonstrates a straightforward and cost‐effective method for significantly improving the dielectric temperature stability of NKBT ceramics.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

High‐entropy strategies boosting dielectric temperature stability in (Na_0.4K_0.1Bi_0.5)TiO₃ ceramics

Meng,

Zhang,

Huang

et al. 2024

J Am Ceram Soc.

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“…Unlike NBT, there are no reports of KNBT solid solutions being "leaky" which means that the insulating behaviour of the stoichiometric KNBTs (x-series) is reproducible and the loss of (K þ Na) during processing surpasses the loss of Bi under different experimental conditions to ensure that (K þ Na):Bi is < 1 in the perovskite lattice of sintered ceramics. [28][29][30][31][32][33][34] KNBTs therefore always possess insulating behaviour unless extra K is intentionally added into the starting composition to compensate for the loss such that (K þ Na):Bi ! 1, as in the y-series.…”

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confidence: 99%

The influence of excess K2O on the electrical properties of (K,Na)1/2Bi1/2TiO3 ceramics

Sinclair

2018

Applied Physics Letters

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The solid solution (K x Na 0.50-x )Bi 0.50 TiO 3 (KNBT) between Na 1/2 Bi 1/2 TiO 3 and K 1/2 Bi 1/2 TiO 3 (KBT) has been extensively researched as a candidate lead-free piezoelectric material because of its relatively high Curie temperature and good piezoelectric properties, especially near the morphotropic phase boundary (MPB) at x $ 0.10 (20 mol. % KBT). Here, we show that low levels of excess K 2 O in the starting compositions, i.e., (K yþ0.03 Na 0.50-y )Bi 0.50 TiO 3.015 (y-series), can significantly change the conduction mechanism and electrical properties compared to a nominally stoichiometric KNBT series (K x Na 0.50-x )Bi 0.50 TiO 3 (x-series). Impedance spectroscopy measurements reveal significantly higher bulk conductivity (r b ) values for y ! 0.10 samples [activation energy (E a ) 0.95 eV] compared to the corresponding x-series samples which possess bandgap type electronic conduction (E a $ 1.26-1.85 eV). The largest difference in electrical properties occurs close to the MPB composition (20 mol. % KBT) where y ¼ 0.10 ceramics possess r b (at 300 C) that is 4 orders of magnitude higher than that of x ¼ 0.10 and the oxide-ion transport number in the former is $0.70-0.75 compared to <0.05 in the latter (between 600 and 800 C). The effect of excess K 2 O can be rationalised on the basis of the (K þ Na):Bi ratio in the starting composition prior to ceramic processing. This demonstrates the electrical properties of KNBT to be sensitive to low levels of Asite nonstoichiometry and indicates that excess K 2 O in KNBT starting compositions to compensate for volatilisation can lead to undesirable high dielectric loss and leakage currents at elevated temperatures. V

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Enhanced electrical properties in Rb-substituted sodium bismuth titanate ceramics

et al. 2016

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Electrical and Piezoelectric Studies of (Na_1-xK_x)_1/2Bi_1/2TiO₃

Cited by 8 publications

References 18 publications

High‐entropy strategies boosting dielectric temperature stability in (Na_0.4K_0.1Bi_0.5)TiO₃ ceramics

High‐entropy strategies boosting dielectric temperature stability in (Na_0.4K_0.1Bi_0.5)TiO₃ ceramics

The influence of excess K2O on the electrical properties of (K,Na)1/2Bi1/2TiO3 ceramics

Enhanced electrical properties in Rb-substituted sodium bismuth titanate ceramics

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Electrical and Piezoelectric Studies of (Na1-xKx)1/2Bi1/2TiO3

Cited by 8 publications

References 18 publications

High‐entropy strategies boosting dielectric temperature stability in (Na0.4K0.1Bi0.5)TiO3 ceramics

High‐entropy strategies boosting dielectric temperature stability in (Na0.4K0.1Bi0.5)TiO3 ceramics

The influence of excess K2O on the electrical properties of (K,Na)1/2Bi1/2TiO3 ceramics

Enhanced electrical properties in Rb-substituted sodium bismuth titanate ceramics

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Product

Resources

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Electrical and Piezoelectric Studies of (Na_1-xK_x)_1/2Bi_1/2TiO₃

High‐entropy strategies boosting dielectric temperature stability in (Na_0.4K_0.1Bi_0.5)TiO₃ ceramics

High‐entropy strategies boosting dielectric temperature stability in (Na_0.4K_0.1Bi_0.5)TiO₃ ceramics