Textured and Tungsten-bronze-niobate-doped (K,Na,Li)(Nb,Ta)O3 Piezoceramic Materials

Soller, Thomas; Bathelt, Robert; Benkert, Katrin; Bödinger, H.; Schuh, Carsten; Schlenkrich, F.

doi:10.3938/jkps.57.942

Cited by 8 publications

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“…), the formation of solid solutions, K/Na ratio, and others. In addition, other methods besides the construction of phase boundaries also affect the piezoelectricity of KNN-based materials, such as sintering temperatures, ,− reactive template grain growth, ,,− spark-plasma sintering, ,− nonstoichiometry, ,,,− two-step sintering, ,− single crystal, ,− ,− poling conditions, ,,,− sintering ai...…”

Section: Type and Construction Of Phase Boundariesmentioning

confidence: 99%

Potassium–Sodium Niobate Lead-Free Piezoelectric Materials: Past, Present, and Future of Phase Boundaries

2015

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compositions but also the temperatures, as shown in Figure 5a. Such a phase boundary is obviously different from that of PZT (see Figure 5b). Regardless of the presence of MPB or PPT characteristics, the polarization of a piezomaterial can be more easily rotated among different symmetries when the compositions are located at the phase boundaries, inducing an enhancement in dielectric and piezoelectric properties. However, recent advances indicate that there is a limited improvement in the d 33 values for KNN materials with O−T or R−O phase boundaries, 90−105,250−252 which is also inferior to most PZT ceramics 5 or even textured KNN. 12 As a result, the formation of R−T boundaries that are similar to PZT may become necessary to further enhance the piezoelectric activity of KNN, because the easy rotations of polarization axes can be induced in compositions near such a phase boundary. 11,35,70,76,106−117 In addition, we recently confirmed this assumption in potassium−sodium niobate piezoceramics by experimental methods, 106−116 and a larger d 33 value has been attained by constructing R−T phase boundaries. 106−112

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Section: Type and Construction Of Phase Boundariesmentioning

confidence: 99%

Potassium–Sodium Niobate Lead-Free Piezoelectric Materials: Past, Present, and Future of Phase Boundaries

2015

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“…In this work, we introduce a new technique for texturing of KNN by tape casting using needlelike KNN templates followed by homoepitaxial grain growth during sintering. First we demonstrate that this technique results in strong texture parallel to the tape casting direction (TCD) and that an orthotropic texture is introduced due to the needlelike KNN templates, whereas prior work using platelet NaNbO 3 templates have created textures of fiber symmetry. In situ X‐ray diffraction during loading of an electrical field was used to investigate domain switching and crystallographic strain.…”

Section: Introductionmentioning

confidence: 94%

“…<001> pc texture introduced by tape casting with NaNbO 3 platelet templates and heterotemplated grain growth resulted in a d 33 value of 373 pC/N in Li and Ta co‐doped KNN . This method has been used previously to fabricate textured KNN, and results in a fiber texture with a < 001> pc axis normal to the tape cast plane. Ceramics prepared by lamination of such tapes with electrodes parallel to the tape cast plane therefore have the orthorhombic polar axes (<011> pc ) oriented away from the direction of the applied electric field.…”

Section: Introductionmentioning

confidence: 99%

Piezoelectric K_0.5Na_0.5NbO₃ Ceramics Textured Using Needlelike K_0.5Na_0.5NbO₃ Templates

et al. 2014

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Improved performance by texturing has become attractive in the field of lead-free ferroelectrics, but the effect depends heavily on the degree of texture, type of preferred orientation, and whether the material is a rotator or extender ferroelectric. Here we report on successful texturing of K0.5Na0.5NbO3 (KNN) ceramics by alignment of needle-like KNN templates in a matrix of KNN powder using tape casting. Homotemplated grain growth of the needles was confirmed during sintering, resulting in a high degree of texture parallel to the tape casting direction and the aligned needles. The texture significantly improved the piezoelectric response parallel to the tape cast direction, corresponding to the direction of the strongest <001>pc orientation, while the response normal to the tape cast plane was lower than for a non-textured KNN. In situ X-ray diffraction during electric field application revealed that non-180° domain reorientation was enhanced by an order of magnitude in the tape casting direction, compared to the direction normal to the tape cast plane and in the non-textured ceramic. The effect of texture in KNN is discussed with respect to possible rotator ferroelectric properties of KNN.3

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“…21 Aer that, tape casting technology was widely used to prepare highly textured KNN-based ceramics and improved dielectric and piezoelectric properties were also achieved. [22][23][24][25] However, it is worth noting that there has been no breakthrough in textured KNN-based ceramics since 2004. Piezoelectric coefficient d 33 of most textured KNN-based ceramics are in the range of 200-300 pC N À1 , which is far below the industrial requirements.…”

Section: Introductionmentioning

confidence: 99%

“…Piezoelectric coefficient d 33 of most textured KNN-based ceramics are in the range of 200-300 pC N À1 , which is far below the industrial requirements. 22,24 Therefore, more efforts should focus on textured KNN-based ceramics.…”

Section: Introductionmentioning

confidence: 99%

Improving piezoelectric properties by controlling phase structure and crystal orientation

Liu

et al. 2017

RSC Adv.

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Textured and Tungsten-bronze-niobate-doped (K,Na,Li)(Nb,Ta)O3 Piezoceramic Materials

Cited by 8 publications

References 0 publications

Potassium–Sodium Niobate Lead-Free Piezoelectric Materials: Past, Present, and Future of Phase Boundaries

Potassium–Sodium Niobate Lead-Free Piezoelectric Materials: Past, Present, and Future of Phase Boundaries

Piezoelectric K_0.5Na_0.5NbO₃ Ceramics Textured Using Needlelike K_0.5Na_0.5NbO₃ Templates

Improving piezoelectric properties by controlling phase structure and crystal orientation

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Textured and Tungsten-bronze-niobate-doped (K,Na,Li)(Nb,Ta)O3 Piezoceramic Materials

Cited by 8 publications

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Potassium–Sodium Niobate Lead-Free Piezoelectric Materials: Past, Present, and Future of Phase Boundaries

Potassium–Sodium Niobate Lead-Free Piezoelectric Materials: Past, Present, and Future of Phase Boundaries

Piezoelectric K0.5Na0.5NbO3 Ceramics Textured Using Needlelike K0.5Na0.5NbO3 Templates

Improving piezoelectric properties by controlling phase structure and crystal orientation

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Piezoelectric K_0.5Na_0.5NbO₃ Ceramics Textured Using Needlelike K_0.5Na_0.5NbO₃ Templates