Morphotropic phase boundary, segregation effect and crystal growth in the NBT–KBT system

Xie, Huidong; Jin, Li; Shen, Dong; Wang, Xiaoqing; Shen, Guangqiu

doi:10.1016/j.jcrysgro.2009.05.031

Cited by 59 publications

(34 citation statements)

References 15 publications

(19 reference statements)

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“…3 Na + -site. 21 The peaks were shifted to lower frequency via Li substation with Li concentration up to 3 mol.% then increased, indicating that Li substituted at Na-site and phase transition occurred to form with XRD results. In addition, the Li radii 0.98 Å, smaller than other ions at A-sites (Na: 1.18 Å, K: 1.33 Å, Bi: 1.17 Å), results in that the [TiO 6 ] octahedral will tilt in order to fill the free space.…”

Section: Resultsmentioning

confidence: 71%

Band gap modification and ferroelectric properties of Bi0.5(Na,K)0.5TiO3-based by Li substitution

Quan¹,

Hùng²,

Quyet³

et al. 2014

AIP Advances

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We report on the reduction of band gap in Bi0.5(Na0.82-xLixK0.18)0.5(Ti0.95Sn0.05)O3 from 2.99 eV to 2.84 eV due to the substitutions of Li+ ions to Na+ sites. In addition, the lithium substitution samples exhibit an increasing of the maximal polarizations from 21.8 to 25.7 μC/cm2. The polarization enhancement of ferroelectric and reduction of the band gaps are strongly related to the Li substitution concentration as evaluated via the electronegative between A-site and oxygen and tolerance factor. The results are promising for photovoltaic and photocatalytic applications.

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Section: Resultsmentioning

confidence: 71%

Band gap modification and ferroelectric properties of Bi0.5(Na,K)0.5TiO3-based by Li substitution

Quan¹,

Hùng²,

Quyet³

et al. 2014

AIP Advances

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“…[5][6][7] This ternary system ceramics exhibited the high apparent piezoelectric constant d33* of 300 pm/V and the temperature of the dielectric maximum of 390 ˚C at the composition of 0.365BT-0.05BMT-0.585BF. 5 As an alternative to BT, we have employed (Bi0.5K0.5)TiO3 (BKT) which has the high Curie temperature of 380 ˚C and has a tetragonal perovskite structure at room temperature [8][9][10] , and the BKT-BMT-BF system has been studied. Then, we found the nano-sized domain structure in this system at the composition of 0.45BKT-0.1BMT-0.45BF 11 although the improvement of the piezoelectric properties were not observed.…”

Section: 3mentioning

confidence: 99%

Preparation of Mn-doped (Bi0.5K0.5)TiO3-Bi(Mg0.5Ti0.5)O3-BiFeO3 Ceramics Using BiFeO3 Particle Synthesized by Hydrothermal Method and Their Piezoelectric Properties

Kamei

Ueno

Nakashima

et al. 2014

Trans. Mat. Res. Soc. Japan

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Mn-doped 0.45(Bi0.5K0.5)TiO3-0.1Bi(Mg0.5Ti0.5)O3-0.45BiFeO3 (BKT-BMT-BF) ceramics were prepared using BiFeO3 (BF) particles synthesized by a hydrothermal synthesis as a starting material to reduce defects originating from evaporation of Bi2O3. X-ray diffraction patterns revealed that the synthesized BF powder and the sintered BKT-BMT-BF ceramics consisted of a single perovskite phase. The grain size of the BKT-BMT-BF ceramics was lager than that prepared by a conventional solid state synthesis. The high-field piezoelectric properties were largely improved because of de-pinning of domain walls. The remanent polarization of 24.5 μC/cm 2 and the apparent piezoelectric coefficient (d33 * ) of 268 pm/V were recorded.

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“…21 Xie et al argued that the MPB region exists only at x ¼ 0:2 and the structure is rhombohedral and tetragonal below and above this value, respectively, and that there is no co-existence of a mixed phase in any compositional region. 22 In all the reported studies on the structural aspects of the BNKT solid solution series, only few compositions have been studied in the MPB region. Therefore, to understand the structure-property correlations in this complicated system, a detailed structural study of the solid solution (1 À x)BNTxBKT where 0 x 0:36 with small compositional variations (Áx in steps of 0.02 for 0 x 0:1 as well as 0:2 x 0:36 and in steps of 0.01 for 0:10 x 0:2) have been carried out by Rietveld refinement of the powder XRD patterns and the changes in the structural parameters are correlated with the changes in the microstructure, density and dielectric constant.…”

Section: Introductionmentioning

confidence: 99%

Correlations between structure, microstructure, density and dielectric properties of the lead-free ferroelectrics Bi_0.5(Na,K)_0.5TiO₃

2015

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Solid solutions of the lead-free ferroelectric oxides Bi 0:5 Na 0:5 TiO 3 (BNT) and Bi 0:5 K 0:5 TiO 3 (BKT), represented as (1 À x)BNTxBKT, are studied for very close compositions in the range 0 x 0:36 to understand the correlation between the structure and the properties. Compositions are varied in steps of Áx ¼ 0:02 in the range 0 x 0:1 and 0:2 x 0:36 and Áx ¼ 0:01 in the range 0:1 x 0:2, to precisely locate the structural transition as well as the morphotropic phase boundary (MPB) region and the compositional region of best performance. Rietveld refinement analysis of the powder X-ray diffraction patterns showed monoclinic phase up to x = 0.17 and a mixture of monoclinic and tetragonal phases for x > 0:17. Similarly, the density and the dielectric constant showed linear variation up to x ¼ 0:17 and a large increase above this composition, showing maximum values in the compositional range 0:22 x 0:26, corresponding to the MPB region. Microstructural features also showed corresponding changes, indicating close relationship between the structure, microstructure and properties of the different compositions.

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Morphotropic phase boundary, segregation effect and crystal growth in the NBT–KBT system

Cited by 59 publications

References 15 publications

Band gap modification and ferroelectric properties of Bi0.5(Na,K)0.5TiO3-based by Li substitution

Band gap modification and ferroelectric properties of Bi0.5(Na,K)0.5TiO3-based by Li substitution

Preparation of Mn-doped (Bi<sub>0.5</sub>K<sub>0.5</sub>)TiO<sub>3</sub>-Bi(Mg<sub>0.5</sub>Ti<sub>0.5</sub>)O<sub>3</sub>-BiFeO<sub>3</sub> Ceramics Using BiFeO<sub>3</sub> Particle Synthesized by Hydrothermal Method and Their Piezoelectric Properties

Correlations between structure, microstructure, density and dielectric properties of the lead-free ferroelectrics Bi_0.5(Na,K)_0.5TiO₃

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Morphotropic phase boundary, segregation effect and crystal growth in the NBT–KBT system

Cited by 59 publications

References 15 publications

Band gap modification and ferroelectric properties of Bi0.5(Na,K)0.5TiO3-based by Li substitution

Band gap modification and ferroelectric properties of Bi0.5(Na,K)0.5TiO3-based by Li substitution

Preparation of Mn-doped (Bi<sub>0.5</sub>K<sub>0.5</sub>)TiO<sub>3</sub>-Bi(Mg<sub>0.5</sub>Ti<sub>0.5</sub>)O<sub>3</sub>-BiFeO<sub>3</sub> Ceramics Using BiFeO<sub>3</sub> Particle Synthesized by Hydrothermal Method and Their Piezoelectric Properties

Correlations between structure, microstructure, density and dielectric properties of the lead-free ferroelectrics Bi0.5(Na,K)0.5TiO3

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Correlations between structure, microstructure, density and dielectric properties of the lead-free ferroelectrics Bi_0.5(Na,K)_0.5TiO₃