Microstructure and piezoelectric properties of Na0.5K0.5NbO3–BiNiO3–LiSbO3 lead-free ceramics

Liu, Chaoying; Liu, Xinyu; Jiang, Minhong; Ma, Jiafeng

doi:10.1016/j.jallcom.2010.04.234

Cited by 12 publications

(10 citation statements)

References 30 publications

(31 reference statements)

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“…Usually monovalent cations (e.g., Li + ,,− ,− and Ag + ) are able to easily substitute the (K,Na) site, and the Nb 5+ site is often replaced by pentavalent cations (e.g., Ta 5+ ,,,− and Sb 5+ − ) because of their identical valence and similar ionic radii. In addition, ABO 3 can be constructed by combining (Mg, Ca, Sr, Ba, Pb) and (Ti, Zr, Hf, Sn) with Bi and (Y, Fe, Sc, Ga, Al, In), − and this ABO 3 can be used to modify the KNN materials. The KNN-based materials are also modified by doping elements (e.g., V, Mn, Co, Ni, Cu, Zn, B, La, Ce, Pr, Nd, Dy, Yb, etc.)…”

Section: Type and Construction Of Phase Boundariesmentioning

confidence: 99%

“…The O–T phase boundary has become the most familiar one since a large breakthrough was achieved in KNN-based materials. , The formation of the O–T phase boundary is one of the mosty hotly contested goals of research into KNN-based materials (refs , , , − , − , − , − , − , , , , and − ). In 2004, the original breakthrough in its d 33 value was achieved by varying O–T phase coexistence to or near room temperature using Li, Ta, and Sb .…”

Section: Type and Construction Of Phase Boundariesmentioning

confidence: 99%

“…In 2004, the original breakthrough in its d 33 value was achieved by varying O–T phase coexistence to or near room temperature using Li, Ta, and Sb . For example, a high d 33 value of ∼416 pC/N was induced in KNN-based textured ceramics due to coexistence of O and T phases at room temperature as well as the use of a new preparation technique (e.g., RTGG), while at the same time LiNbO 3 - or LiTaO 3 -modified KNN ceramics have attained enhanced piezoelectric activity by construction of the same phase boundary using conventional solid-state methods. , These original works have greatly increased worldwide research interest in lead-free piezoelectrics, and thus, scientists have devoted much energy into further promotion of the piezoelectric activity by constructing O–T phase boundaries (refs , , , − , − , − , − , − , , , , and − …”

Section: Type and Construction Of Phase Boundariesmentioning

confidence: 99%

“…In the past, a number of successful attempts were made to construct O–T phase boundaries in KNN-based ceramics in order to induce enhancement of its piezoelectric activity, including ion substitutions (e.g., using Li + , ,,,− Li + /Sb 5+ , − Li + /Ta 5+ , ,,,− Li + /Sb 5+ /Ta 5+ , ,,− etc. ), solid solutions with other ABO 3 -type perovskites − or ABO 3 multicomponents, − variation of the K/Na ratio, ,,− new preparation techniques, ,,…”

Section: Type and Construction Of Phase Boundariesmentioning

confidence: 99%

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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%

Section: Type and Construction Of Phase Boundariesmentioning

confidence: 99%

Section: Type and Construction Of Phase Boundariesmentioning

confidence: 99%

Section: Type and Construction Of Phase Boundariesmentioning

confidence: 99%

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

2015

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“…However, there is no experimental evidence for BiNiO3 being a multiferroic (Catalan, 2008). To the best of our knowledge, there are only few reports about BiNiO3-based solid solution, such as Na0.5K0.5NbO3-BiNiO3-LiSbO3 (Liu, Liu, Jiang, & Ma, 2010 The main peaks can be ascribed to a perovskite structure which means KNBN (x=0,0.05,0.10,0.15,0.20 x=0.05 and x=0.10, an asymmetry of the peak shape is observed on the higher 2θside…”

Section: Discussionmentioning

confidence: 98%

Processing-composition-structure effects on the optical band gap of KNbO3-based ceramics

Pascual-González¹

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This present work is focused on band-gap engineering of solid-solutions based on KNbO3, which was proposed as a promising photoferroelectric (Grinberg et al., 2013). The strategy to narrow the band-gap of the parent KNbO3 (3.22 eV), relies on replacing Nb 5+ by lower valence transition metals (Me 3+) and K +1 by cations which maintain the compositions stoichiometric. Ceramic processing of KNbO3 by conventional route was optimised in order to minimise K losses, which leads to the formation of a hygroscopic secondary phase, K4Nb6O17. This phase impairs the structural integrity of the samples. In addition, single-phase KNbO3 ceramics have the tendency to absorb moisture from the environment, increasing its conductivity near room temperature. Subsequently, all solid-solutions presented in this work, (1-x) KNbO3-x Ba0.5Bi0.5Nb0.5Zn0.5O3 and (1-x) KNbO3-x BiMeO3 (Me= Mn, Co and Ni) systems in a compositional range of 0≤x≤0.25, 0.90 KNbO3-0.1 BaNb0.5Ni0.5O3 and 0.98 K0.5Na0.5NbO3-0.02 BaNb0.5Ni0.5O3 compounds, were prepared by the same route as KNbO3. X-Ray Diffraction (XRD), Raman spectroscopy and Scanning Electron Microscopy (SEM) revealed compositionally inhomogeneities, suggesting difficulties in cation diffusion for low concentration of solutes by conventional routes. The systems evolve from orthorhombic (x=0) to pseudo-cubic symmetry with an increase of x, suggested by XRD, Raman spectroscopy, ferroelectric and dielectric response. Indeed, these two symmetries seem to coexist for intermediary concentrations. A solubility limit for orthorhombic KNbO3 phase is determined for each system. In addition, a continuous band-gap narrowing was observed in all systems. Nevertheless, (1-x) KNbO3-x BiFeO3 (0≤x≤0.25) system maintained the polar phase up to x=0.25 and its band-gap was narrowed down to 2.22 eV. Indeed, a photocurrent of 0.24 µA/cm 2 was measured for 0.75 KNbO3-0.25 BiFeO3 which is higher than reported for the controversial 0.90 KNbO3-0.1 BaNb0.5Ni0.5O3 compound (Grinberg et al., 2013). The literature does not agree about its band-gap value, which varies from 1.3 eV to 3 eV. Hypothetically, the impossibility of preparing chemically homogenised samples by solidstate reaction may lead to the occurrence of intraband states, which can be misinterpreted. Similar conclusions are reached for 0.98 K0.5Na0.5NbO3-0.02BaNb0.5Ni0.5O3. = 0 • • Eq. 1.2. where (F m −1) is the dielectric susceptibility of the material and 0 is the dielectric permittivity of vacuum and it has a constant value of 8.854•10 −12 F m −1. The total quantity BT undergoes a series of phase transitions with temperature. Figure 1. 8 illustrates these successive phase transitions (Rhombohedral-to-orthorhombic, orthorhombic-totetragonal, tetragonal-to-cubic) which are accompanied by dielectric anomalies. Above 130ºC, the unit cell acquires a cubic form and consequently, spontaneous polarisation disappears. Overall, the transition from polar to non-polar phase in ferroelectrics occurs at certain temperature, also called Curie temperature and it is characterist...

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Effects of Li on electrical properties of (K_0.47Na_0.53)_1−xLi_xNb_0.94Sb_0.06O₃ lead‐free ceramics

Zhang

Xiao

et al. 2011

Physica Status Solidi (a)

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(K0.47Na0.53)1−xLixNb0.94Sb0.06O3 (KNNS‐xLi, x = 0–0.08) lead‐free piezoelectric ceramics have been prepared by conventional solid‐state sintering process. The electrical properties of the ceramics were investigated. The coexistence of orthorhombic and tetragonal perovskite phases at room temperature results in enhancement of piezoelectric properties for the ceramics with 0.04≤x≤0.06. The ceramics with x = 0.06 possess optimum piezoelectric properties: d33∼255 pC/N, kp∼44.3%, and Tc∼350 °C. These results show that the (K0.47Na0.53)1−xLixNb0.94Sb0.06O3 ceramic can be a potential candidate for lead‐free piezoelectric materials.

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Microstructure and piezoelectric properties of Na0.5K0.5NbO3–BiNiO3–LiSbO3 lead-free ceramics

Cited by 12 publications

References 30 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

Processing-composition-structure effects on the optical band gap of KNbO3-based ceramics

Effects of Li on electrical properties of (K_0.47Na_0.53)_1−xLi_xNb_0.94Sb_0.06O₃ lead‐free ceramics

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Microstructure and piezoelectric properties of Na0.5K0.5NbO3–BiNiO3–LiSbO3 lead-free ceramics

Cited by 12 publications

References 30 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

Processing-composition-structure effects on the optical band gap of KNbO3-based ceramics

Effects of Li on electrical properties of (K0.47Na0.53)1−xLixNb0.94Sb0.06O3 lead‐free ceramics

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Effects of Li on electrical properties of (K_0.47Na_0.53)_1−xLi_xNb_0.94Sb_0.06O₃ lead‐free ceramics