Towards Lead-Free Piezoceramics: Facing a Synthesis Challenge

Villafuerte‐Castrejon, M. E.; Morán, E.; Reyes-Montero, Armando; Vivar-Ocampo, Rodrigo; Peña-Jiménez, Jesús-Alejandro; Rea-López, Salvador-Oliver; Pardo, L.

doi:10.3390/ma9010021

Cited by 95 publications

(63 citation statements)

References 154 publications

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“…As an example, Liu et al 4 reported a high piezoelectric coefficient d 33 ~690 pC/N for this binary composition. Scientists have made several efforts to reproduce this value by synthesizing through different routes and controlling density and grain growth 5 . For the Ba 0.9 Ca 0.1 Ti 0.9 Zr 0.1 O 3 composition (denoted in this work as BCZT), earlier reports suggest a single perovskite crystal structure with tetragonal phase (P4mm space group, No.…”

Section: Introductionmentioning

confidence: 99%

Local piezo-response for lead-free Ba0.9Ca0.1Ti0.9Zr0.1O3 electro-ceramic by switching spectroscopy

et al. 2018

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The purpose of this work is to determine the effective piezoelectric coefficient (d 33 ) and the macro ferroelectric hysteresis behavior for the Ba 0.9 Ca 0.1 Ti 0.9 Zr 0.1 O 3 (BCZT). The sample was prepared by the modified Pechini method and it was sintered at 1250 ºC for 5 h. The refinements of X-ray diffraction (XRD) patterns obtained by the Rietveld method suggest a slight degree of tetragonality (c/a = 1.0025) in the perovskite structure. High counting statistics was performed in the two-dimensional grazing incidence 2D-GIXRD characterization by using synchrotron radiation. These results and the Raman spectrum analysis support the XRD interpretation. The morphology reveals a non-homogeneous terrace-type shape with a grain size distribution centered at 13 microns. The switching spectroscopy piezo-response force microscopy was used to obtained the effective d 33 = 142 pm/V. The soft ferroelectric hysteresis shows a coercive field H c = 1.3 kV/cm with a saturation polarization P s = 15.7 µC/cm 2 .

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Section: Introductionmentioning

confidence: 99%

Local piezo-response for lead-free Ba0.9Ca0.1Ti0.9Zr0.1O3 electro-ceramic by switching spectroscopy

et al. 2018

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“…A decrease of t below 0.9 reduces the crystal symmetry and this causes a structural phase transition, as it is often observed in perovskite oxides. 31 MAPbI 3 undergoes a cubic-tetragonal and tetragonal-orthorhombic transition at two critical temperatures. 32,33 The phase transition temperatures for MAPbX 3 [X = I, Br, and Cl] perovskites are summarized in Figure 2.…”

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confidence: 99%

Free Carrier Radiative Recombination and Photon Recycling in Lead Halide Perovskite Solar Cell Materials

Yamada

Kanemitsu

2017

Bulletin of the Chemical Society of Japan

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Organic-inorganic hybrid lead halide perovskites are currently a most attractive class of materials since they have emerged as a solar cell material that realizes both high efficiency and simple low-cost fabrication. The power conversion efficiencies of perovskite solar cells now exceed 22%, which is comparable to that of commercially available CIGS and CdTe thin film solar cells. The key to further improvement is understanding the physical origin of the high efficiency of the perovskite solar cells, and a tremendous effort to come closer to this target has been made through numerous experiments.In this review article, we discuss the optoelectronic properties of perovskite CH 3 NH 3 PbX 3 (X = I and Br) solar cell materials. Special attention is given to the free carrier recombination and photon recycling (the re-absorption of photons emitted by radiative recombination of photocarriers) processes in CH 3 NH 3 PbX 3 single crystals, because a deep understanding of these processes is crucial for improving the solar cell performance. Lead halide perovskites show unique optical properties, e.g., extremely high quantum efficiency of luminescence, small Urbach tail in the absorption spectra, and long lifetime of photocarriers, which all suggest a low density of

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“…In terms of piezoelectric activity at room temperature, they are quite far from other lead free piezoelectric compositions. While the highest d 33 coefficients reach values no higher than 40 pC/N (even in textured ceramics), other families of compositions reach very much higher values [90]. Thus, within the solid solution [92].…”

Section: Perspectives Of Aurivillius Materials As Lead Free Piezoelecmentioning

confidence: 95%

Review and Perspectives of Aurivillius Structures as a Lead-Free Piezoelectric System

Moure

2018

Applied Sciences

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According to the EU-Directives 2002/95/EC, 2002/96/EC, lead-based piezoceramics must be substituted in the future with more environmentally friendly alternatives, only when a reliable alternative is found. This is why an increasing interest has grown in the research community to find lead free piezoelectric materials that fulfil the requirements for this substitution. Different families of compounds have been shown to be possible candidates for this use, such as bismuth and niobates based perovskites, pyrochlores, etc. However, a material with piezoelectric coefficients similar to those of PZT (lead zirconate titanate, Pb[Zr x Ti 1-x ]O 3 ) has not been yet found. Besides, each of these families has its specific characteristics in terms of remnant polarization, coercive field or application temperature. Thus, the choice of each material should be made according to the specific needs of the application. In this sense, Aurivillius-type structure materials (also known as Bismuth Layered Structure Ferroelectrics, BLSF) can take advantage of their specific properties for uses as Lead Free Piezoelectric systems. Some of them have a high Curie temperature, which make them good candidates to be used as high temperature piezoelectrics; high coercive fields, which facilitates their use as actuators; or a high switching fatigue resistance, which can be useful for future applications as Ferroelectric Random Access Memories (FERAM).Keywords: bismuth layered ferroelectric structures; aurivillius; piezoelectric; multiferroic OverviewMany of the peculiar characteristic properties of Aurivillius materials are determined by their crystalline structure. Figure 1 shows the prototype of the Aurivillius structure as a function of the number of pseudo-perovskite layers [2]. The "n" values can range from 1 to ∞. In this case (n = ∞), the repeated cell is the pure perovskite. The number of perovskites can be odd, even or a mixture. Examples of each case are Bi 2 WO 6 (n = 1) and Bi 4 Ti 3 O 12 (n = 3); Bi 3 TiNbO 9 , SrBi 2 Nb 2 O 9 (n = 2) and CaBi 4 Ti 4 O 12 (n = 4); an example for a mixture Aurivillius is Bi 7 Ti 4 NbO 21 . In this case, layers with 2 or 3 pseudo-perovskites are alternated with the [Bi 2 O 2 ] 2+ layers.At difference of the ferroelectrics with perovskite structure, the polarization is not produced by the displacement of the B cation within the oxygen octahedral but by relative shifts of the oxygen octahedral through the a-axis with respect to the [001] bismuth chain. They can be divided in 3 main movements, as illustrated in references [3-5]:Oxygen octahedral in the a-axis. -Relative displacements in the opposite direction to B cations of the perovskite with respect to the octahedral. -Displacement through the a-axis of the oxygen ions of the Bi-O layer.

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Towards Lead-Free Piezoceramics: Facing a Synthesis Challenge

Cited by 95 publications

References 154 publications

Local piezo-response for lead-free Ba0.9Ca0.1Ti0.9Zr0.1O3 electro-ceramic by switching spectroscopy

Local piezo-response for lead-free Ba0.9Ca0.1Ti0.9Zr0.1O3 electro-ceramic by switching spectroscopy

Free Carrier Radiative Recombination and Photon Recycling in Lead Halide Perovskite Solar Cell Materials

Review and Perspectives of Aurivillius Structures as a Lead-Free Piezoelectric System

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