(Bi1/2Na1/2)TiO3-(Bi1/2K1/2)TiO3-BaTiO3-Based Lead-Free Piezoelectric Ceramics

Makiuchi, Yoichi; Aoyagi, Rintaro; Hiruma, Yuji; Nagata, Hajime; Takenaka, Tadashi

doi:10.1143/jjap.44.4350

Cited by 85 publications

(56 citation statements)

References 14 publications

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“…Promising lead-free ferroelectrics (FEs) include compositions based on sodium potassium niobate Na (1Àx) K x NbO 3 (KNN) and bismuth sodium titanate Bi 1/2 Na 1/2 TiO 3 (BNT). [3][4][5][6][7][8] In 2007, Zhang et al 9 reported a new pseudo-ternary composition, replacing a small fraction of BNT with KNN from the Bi 1/2 Na 1/2 TiO 3 -BaTiO 3 (BNT-BT) system, which showed large electric-field-induced strain values (0.45% at 8 kV/mm). This field-induced strain response remains stable against temperature 10 and cyclic fatigue.…”

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confidence: 99%

Tailoring of unipolar strain in lead-free piezoelectrics using the ceramic/ceramic composite approach

Khansur

Groh

et al. 2014

Journal of Applied Physics

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Local structure change evidenced by temperature-dependent elastic measurements: Case study on Bi1/2Na1/2TiO3-based lead-free relaxor piezoceramics J. Appl. Phys. 115, 084108 (2014) Tailoring of unipolar strain in lead-free piezoelectrics using the ceramic/ceramic composite approach The electric-field-induced strain response mechanism in a polycrystalline ceramic/ceramic composite of relaxor and ferroelectric materials has been studied using in situ high-energy x-ray diffraction. The addition of ferroelectric phase material in the relaxor matrix has produced a system where a small volume fraction behaves independently of the bulk under an applied electric field. Inter-and intra-grain models of the strain mechanism in the composite material consistent with the diffraction data have been proposed. The results show that such ceramic/ceramic composite microstructure has the potential for tailoring properties of future piezoelectric materials over a wider range than is possible in uniform compositions. V C 2014 AIP Publishing LLC.

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confidence: 99%

Tailoring of unipolar strain in lead-free piezoelectrics using the ceramic/ceramic composite approach

Khansur

Groh

et al. 2014

Journal of Applied Physics

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“…Interestingly, the temperature for FE-to-AFE transition has been assigned to T d instead of T s in the later publications. [19][20][21][22] In fact, the use of T d for FE-to-AFE transition is conceptually more logical than that of T s in that the FE-to-AFE transition in this type of materials is supposed to be a first-order transition 12 and consequently should be frequency-independent with a sharp peak in the corresponding dielectric responses. It is, however, noted that T d is always lower than T s , 23 which makes the deviation from the structural data in the literature even larger.…”

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confidence: 99%

On the phase identity and its thermal evolution of lead free (Bi1/2Na1/2)TiO3-6 mol% BaTiO3

Schaab

Sapper

et al. 2011

Journal of Applied Physics

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Articles you may be interested inElectric-field-temperature phase diagram of the ferroelectric relaxor system (1−x)Bi1/2Na1/2TiO3−xBaTiO3 doped with manganese J. Appl. Phys. 115, 194104 (2014); 10.1063/1.4876746Long ranged structural modulation in the pre-morphotropic phase boundary cubic-like state of the lead-free piezoelectric Na1/2Bi1/2TiO3-BaTiO3 J. Appl. Phys. 114, 234102 (2013) On the phase identity and its thermal evolution of lead free (Bi 1/2 Na 1/2 )TiO 3 -6 mol% BaTiO 3 Temperature-dependent dielectric permittivity of 0.94(Bi 1/2 Na 1/2 )TiO 3 -0.06BaTiO 3 (BNT-6BT) lead-free piezoceramics was studied to disentangle the existing unclear issues over the crystallographic aspects and phase stability of the system. Application of existing phenomenological relaxor models enabled the relaxor contribution to the entire dielectric permittivity spectra to be deconvoluted. The deconvoluted data in comparison with the temperature-dependent dielectric permittivity of a classical perovskite relaxor, La-modified lead zirconate titanate, clearly suggest that BNT-6BT belongs to the same relaxor category, which was also confirmed by a comparative study on the temperature-dependent polarization hysteresis loops of both materials. Based on these results, we propose that the low-temperature dielectric anomaly does not involve any phase transition such as ferroelectric-toantiferroelectric. Supported by transmission electron microscopy and X-ray diffraction experiments at ambient temperature, we propose that the commonly observed two dielectric anomalies are attributed to thermal evolution of ferroelectric polar nanoregions of R3c and P4bm symmetry, which coexist nearly throughout the entire temperature range and reversibly transform into each other with temperature.

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“…Promising lead-free piezoelectrics are mainly based on solid solutions incorporating either Bi 1/2 Na 1/2 TiO 3 (BNT) or Na x K 1-x NbO 3 (KNN). [2][3][4][5][6][7] Although lead-free compositions of piezoelectric materials have been reported with excellent properties, no single composition has been identified with the potential for the replacement of PZT over the range of technological application conditions. To further improve the electro-mechanical properties of these materials, a comprehensive understanding of the underlying microscopic origin of the electric-field-induced strain is requisite.…”

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The effect of inter-granular constraints on the response of polycrystalline piezoelectric ceramics at the surface and in the bulk

Hossain

Wang

Khansur

et al. 2016

Applied Physics Letters

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The electro-mechanical coupling mechanisms in polycrystalline ferroelectric materials, including a soft PbZrxTi1−xO3 (PZT) and lead-free 0.9375(Bi1/2Na1/2)TiO3-0.0625BaTiO3 (BNT-6.25BT), have been studied using a surface sensitive low-energy (12.4 keV) and bulk sensitive high-energy (73 keV) synchrotron X-ray diffraction with in situ electric fields. The results show that for tetragonal PZT at a maximum electric field of 2.8 kV/mm, the electric-field-induced lattice strain (ε111) is 20% higher at the surface than in the bulk, and non-180° ferroelectric domain texture (as indicated by the intensity ratio I002/I200) is 16% higher at the surface. In the case of BNT-6.25BT, which is pseudo-cubic up to fields of 2 kV/mm, lattice strains, ε111 and ε200, are 15% and 20% higher at the surface, while in the mixed tetragonal and rhombohedral phases at 5 kV/mm, the domain texture indicated by the intensity ratio, I111/I111¯ and I002/I200, are 12% and 10% higher at the surface than in the bulk, respectively. The observed difference in the strain contributions between the surface and bulk is suggested to result from the fact that surface grains are not constrained in three dimensions, and consequently, domain reorientation and lattice expansion in surface grains are promoted. It is suggested that the magnitude of property difference between the surface and bulk is higher for the PZT than for BNT-6.25BT due to the level of anisotropy in the strain mechanism. The comparison of the results from different methods demonstrates that the intergranular constraints have a significant influence on the electric-field-induced electro-mechanical responses in polycrystalline ferroelectrics. These results have implications for the design of higher performance polycrystalline piezoelectrics.

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(Bi_1/2Na_1/2)TiO₃-(Bi_1/2K_1/2)TiO₃-BaTiO₃-Based Lead-Free Piezoelectric Ceramics

Cited by 85 publications

References 14 publications

Tailoring of unipolar strain in lead-free piezoelectrics using the ceramic/ceramic composite approach

Tailoring of unipolar strain in lead-free piezoelectrics using the ceramic/ceramic composite approach

On the phase identity and its thermal evolution of lead free (Bi1/2Na1/2)TiO3-6 mol% BaTiO3

The effect of inter-granular constraints on the response of polycrystalline piezoelectric ceramics at the surface and in the bulk

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