Extrinsic response enhancement at the polymorphic phase boundary in piezoelectric materials

Ochoa, Diego A.; Esteves, Giovanni; Jones, Jacob L.; Rubio-Marcos, Fernando; Fernández, J.F.; García, José E.

doi:10.1063/1.4945593

Cited by 26 publications

(25 citation statements)

References 27 publications

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“…Furthermore, the core-shell type microstructure could have an additional effect on the polarisation switching characteristics. In contrast, Ochoa et al [27] found that (K0.44Na0.…”

Section: Ferroelectric Propertiesmentioning

confidence: 86%

Structural and functional characterisation of KNNS–BNKZ lead-free piezoceramics

Tangsritrakul

Hall

2017

Advances in Applied Ceramics

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Promising piezoelectric properties have been reported recently for lead-free 0.96(K0.48Na0.52Nb0.95Sb0.05)-0.04Bi0.5(Na0.82K0.18)0.5ZrO3 (KNNS-BNKZ) ceramics. The presence of coexisting ferroelectric rhombohedral and tetragonal phases is thought to play a key role in their functional properties, but a thorough understanding is currently lacking. In this experiment, (1-x)KNNS-(x)BNKZ ceramics with x = 0 to 0.05 were prepared by the mixed-oxide method. High resolution synchrotron x-ray powder diffraction (SXPD) measurements reveal that the addition of BNKZ into KNNS ceramics leads to an increase of the rhombohedral-orthorhombic phase transition temperature (TR-O) and a reduction of the orthorhombic-tetragonal phase transition temperature (TO-T) leading to orthorhombic-tetragonal and rhombohedral-tetragonal phase coexistence at room temperature for compositions with x = 0.02 and 0.04, respectively. By combining the results of the SXPD measurements with microstructural examination using SEM, evidence is also found for the occurrence of chemical heterogeneity, which could provide an additional means to control the functional properties. The structural observations are correlated with changes in the dielectric properties, obtained as permittivity-temperature plots, and variations in the polarisation and coercive field values, obtained from measurements of the ferroelectric hysteresis loops.

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“…Furthermore, the core-shell type microstructure could have an additional effect on the polarisation switching characteristics. In contrast, Ochoa et al [27] found that (K0.44Na0.…”

Section: Ferroelectric Propertiesmentioning

confidence: 86%

Structural and functional characterisation of KNNS–BNKZ lead-free piezoceramics

Tangsritrakul

Hall

2017

Advances in Applied Ceramics

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“…[33] have recently reported that, in addition to the intrinsic contribution, the extrinsic contribution (domain wall contribution) also maximizes in a PPB region. Thus, the extrinsic contribution is also responsible for improving the functional properties at the PPB [33]. Despite the progress achieved recently, a fundamental question nevertheless arises:…”

Section: Introductionmentioning

confidence: 99%

Understanding the piezoelectric properties in potassium-sodium niobate-based lead-free piezoceramics: Interrelationship between intrinsic and extrinsic factors

Rubio-Marcos

Fernández

Ochoa

et al. 2017

Journal of the European Ceramic Society

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Lead zirconate titanate (PZT) based ceramics are currently enjoying a wide use in piezoelectric devices despite lead toxicity. Due to growing environmental concerns, the attention on piezoelectric ceramics has been moving to lead-free materials, in particular to (K,Na)NbO 3-based ceramics. Here we report a systematic evaluation of the effects of the compositional modifications on [(K0.44Na0.52Li0.04)[(Nb0.86Ta0.10Sb0.04)1-xZr5x/4]O3 lead-free piezoceramics. We show that an interrelationship between the intrinsic and extrinsic factors is the linchpin for the development of good piezoelectric properties. Hence, the stabilization of the tetragonal symmetry on the orthorhombic-tetragonal polymorphic phase boundary facilities the poling process of the system, thereby enhancing the piezoelectric response. Additionally, the microstructure appears to be related to the piezoelectric properties; i.e., the improved piezoelectric properties correlate to the increase in grain size. The results of this work could help to understand the origin of piezoelectricity in potassium-sodium niobate-based ceramics.

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“…5b, when x ≤ 0.3 the characteristic XRD peak around 45°splits obviously, showing two 002 and 200 reflections. Its peak intensity ratio (I 002 /I 200 ) is close to 2/1, which is the characteristics of orthorhombic (O) phase [32,33]. For the samples with x = 0.06, two peaks are merged into a single peak, a characteristic of rhombohedral (R) phase.…”

Section: Structure Of Cz-knlns Powdersmentioning

confidence: 88%

“…Diffraction peaks of other impurities are not observed, indicating that Li + , Sb 5+ , Ca 2+ , Zr 4+ have been completely dissolved in the KNLNS lattice during the microwave calcination stage. The characteristics of the KNLNS based ceramic crystal structures can be quantitatively identified from the relative intensities of the 002 and 200 peaks (I 002 /I 200 ) in the 2θ range of 44-47° [32,33]. As displayed in partially magnified view in Fig.…”

Section: Structure Of Cz-knlns Powdersmentioning

confidence: 99%

Structure and piezoelectric properties of cazro3-modified (K,Na,Li)(Nb,Sb)O3 ceramics prepared from powders synthesized by microwave heating

Fan

Jia

et al. 2019

PAC

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CaZrO 3 -modified (K 0.48 Na 0.48 Li 0.04 )(Nb 0.95 Sb 0.05 )O 3 (CZ-KNLNS) lead-free piezoelectric powders were synthesized by microwave method followed by conventional solid state sintering. Different amounts of CaZrO 3 were added (i.e. x = 0, 0.02, 0.03, 0.04, 0.06 mol) and their effects on the crystal structure, microstructure, as well as the electrical properties, were investigated. The results showed that CZ-KNLNS powders could be obtained by microwave heating at a relatively low temperature and short time of 650°C and 10 min, respectively. The obtained CZ-KNLNS powders have cubic structure and good crystallinity with average particle size of 300-700 nm. The particle size gradually decreases with the increase of CaZrO 3 amount, indicating that addition of CaZrO 3 inhibits the growth of the particles. The powders were further sintered at 1120°C for 4 h and CZ-KNLNS ceramics with homogeneous and highly dense microstructure were obtained. X-ray diffraction showed that, with increasing CaZrO 3 content, the phase structure gradually changed from orthorhombic to rhombohedral, which can be considered as the coexistence zone of orthorhombic-rhombohedral (O-R) phase in the range of 0.03 < x < 0.06. The optimized content of CaZrO 3 is x = 0.04, at which the CZ-KNLNS piezoelectric ceramics show good properties and maximum d 33 = 201.2 pC/N and K p = 36.8%. dielectric constant and environmental friendliness. The KNN-based ceramics are considered to be one of the most promising alternative materials to replace the lead-based ceramics. However, the piezoelectricity of KNN lead-free piezoelectric material is still inferior to that of lead-based material. Generally, the d 33 of the PZT series is higher than 400 pC/N, while the d 33 of the pure KNN base material is only 80 pC/N [4][5][6].It is reported that the piezoelectricity of KNN can be greatly improved by the formation of multiphase coexistence [7,8]. Doping is commonly used, such as doping with Li + and Ag + into A site, or Sb 5+ and Ta 5+ which can act as the B site adulteration. In addition, when the ABO 3 perovskite structure (such as LiSbO 3 , LiTaO 3 , Bi 0.5 Li 0.5 TiO 3 , Ba(Zr 0.52 Ti 0.48 )TiO 3 ) is introduced in KNN, the orthogonal tetragonal (O-T) coexistence near room temperature can be obtained. Formation of

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Extrinsic response enhancement at the polymorphic phase boundary in piezoelectric materials

Cited by 26 publications

References 27 publications

Structural and functional characterisation of KNNS–BNKZ lead-free piezoceramics

Structural and functional characterisation of KNNS–BNKZ lead-free piezoceramics

Understanding the piezoelectric properties in potassium-sodium niobate-based lead-free piezoceramics: Interrelationship between intrinsic and extrinsic factors

Structure and piezoelectric properties of cazro3-modified (K,Na,Li)(Nb,Sb)O3 ceramics prepared from powders synthesized by microwave heating

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