Ferroelectric properties of lanthanum and titanium modified SBN ceramic system

Venet, Michel; Garcia, D.; Eiras, J. A.; M’Peko, Jean-Claude; Amorín, Harvey

doi:10.1002/pssb.200301634

Cited by 5 publications

(4 citation statements)

References 16 publications

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“…Besides the increase of density, the enhancement of P r , permittivity, and piezoelectric constant of PLTN ceramics with La content x was related to formation of lead vacancies introduced by the substitution of Pb 2+ by La 3+ , which is favorable for the movement of electric domains under the electric field. Other factors such as dipole association between dopants and vacancies also contributed to the P r values at high‐electric field 26 …”

Section: Resultsmentioning

confidence: 99%

“…Other factors such as dipole association between dopants and vacancies also contributed to the P r values at high-electric field. 26 The quality factor Q m of PLTN ceramics increases with the increase of La content. It is still a low value (o20), comparable with those of soft piezoceramics, and materials with a low quality factor are suitable for wide band ultrasonic transducers.…”

Section: August 2009mentioning

confidence: 99%

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Effects of La on Dielectric and Piezoelectric Properties of Pb_1−xLa_2x/3(Nb_0.95Ti_0.0625)₂ O₆ Ceramics

Men

Liu

Zhang

et al. 2009

Journal of the American Ceramic Society

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Ceramics with the chemical compositions of Pb1−xLa2x/3(Nb0.95Ti0.0625)2O6 (0≤x≤0.060) (PLTN) were prepared by the conventional solid‐state reaction method. X‐ray diffraction analysis indicated that Ti and La doping not only decreased the rhombohedral–tetragonal phase transformation temperature, but also stabilized the orthorhombic phase of PLTN ceramics. All ceramics sintered at 1190°–1250°C had shown the pure orthorhombic ferroelectric phase. La doping suppresses grain growth and inhibits the formation of pores and cracks, resulting in an increase in relative density up to 97%. The amount of La doping to PLTN ceramics obviously affect ceramics' piezoelectric constant (d33) and dielectric loss (tanδ). The sample with x=0.015 possesses high Curie temperature (Tc=560°C), low dielectric loss (tanδ=0.0054), and excellent piezoelectric constant (d33=92 pC/N), presenting a high potential to be used in high‐temperature applications as piezoelectric transducers.

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Section: Resultsmentioning

confidence: 99%

Section: August 2009mentioning

confidence: 99%

Effects of La on Dielectric and Piezoelectric Properties of Pb_1−xLa_2x/3(Nb_0.95Ti_0.0625)₂ O₆ Ceramics

Men

Liu

Zhang

et al. 2009

Journal of the American Ceramic Society

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“…In the paraelectric phase, PBN is found as tetragonal with 4/mmm symmetry [2,5]. The addition of rare earths and other ions provide a fine control of the physical properties in tungsten bronze compounds [6][7]. Particularly, the La 3+ doping in PBN ceramics, has been accomplished, manly to enhance the optical properties.…”

Section: Characterization Of La-doped Pbn Ferroelectric Ceramicsmentioning

confidence: 98%

Characterization of La-Doped PBN Ferroelectric Ceramics

et al. 2006

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In this work, pure and La 3+ -doped PBN56 ceramics (La 3+ added from 0 wt% to 4 wt%) were fabricated and studied concerning its structure, microstructure and dielectric properties. The analysis of the microstructure of the ceramics showed a change of the grain morphology for ceramics with La content higher than 1.0 wt%. X-ray diffraction and Raman spectroscopy were performed to study the structure of the PBN56 ceramics. The results showed the presence of an orthorhombic phase, whose concentration is increased with the increasing of the La 3+ content. The analysis of the results was performed to investigate the presence of the orthorhombic phase and the composition where its formation begins.

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“…Diagrams of the poling/ I – V test circuits and ferroelectric domain orientations on an ideally poled SBN-50 pellet are shown in Figure a. Two kinds of metal were chosen as the contacting electrodes: Ag with a work function of 4.3 eV, which is usually used in conventional tests, , and Pt with a work function of 5.3 eV . These samples are noted as SBN-50-Ag and SBN-50-Pt, respectively.…”

Section: Results and Discussionmentioning

confidence: 99%

Dual Extraction of Photogenerated Electrons and Holes from a Ferroelectric Sr_0.5Ba_0.5Nb₂O₆ Semiconductor

Fan

Zhu

Wang

et al. 2016

ACS Appl. Mater. Interfaces

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The separation of photogenerated charges is a critical factor in photocatalysis. Recently, anomalous photovoltaic (APV) field effects (Voc ∼ 10(3) V/cm) in ferroelectrics, with their strong driving force for charge separation, have attracted much attention in photocatalysis and photoelectrocatalysis. However, it is still unknown whether photogenerated electrons and holes can be simultaneously extracted by the strong driving force toward the surface of ferroelectrics and can become available for surface reactions. This issue becomes critically important in photocatalysis because the surface reaction utilizes both the electrons and holes that reach the surface. In this work, a model lateral symmetric structure, metal/Sr0.5Ba0.5Nb2O6/metal (metal = Ag or Pt), as an electrode was fabricated. The dual extractions of photogenerated electrons and holes on the two opposite metal electrodes were achieved, as revealed by photovoltaic and ferroelectrical hysteresis measurements and photoassisted Kelvin probe force microscopy (KPFM). It was found that the high Schottky barriers of the two opposite Sr0.5Ba0.5Nb2O6-Pt electrodes are key factors that alter the two space charge regions (SCRs) by a poling effect. The resulting built-in electrical fields with parallel directions near both electrodes significantly enhance the charge separation ability. Our model unravels the driving force of charge separation in ferroelectric semiconductors, thus demonstrating the potential for highly efficient charge separation in photocatalysis.

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Ferroelectric properties of lanthanum and titanium modified SBN ceramic system

Cited by 5 publications

References 16 publications

Effects of La on Dielectric and Piezoelectric Properties of Pb_1−xLa_2x/3(Nb_0.95Ti_0.0625)₂ O₆ Ceramics

Effects of La on Dielectric and Piezoelectric Properties of Pb_1−xLa_2x/3(Nb_0.95Ti_0.0625)₂ O₆ Ceramics

Characterization of La-Doped PBN Ferroelectric Ceramics

Dual Extraction of Photogenerated Electrons and Holes from a Ferroelectric Sr_0.5Ba_0.5Nb₂O₆ Semiconductor

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Ferroelectric properties of lanthanum and titanium modified SBN ceramic system

Cited by 5 publications

References 16 publications

Effects of La on Dielectric and Piezoelectric Properties of Pb1−xLa2x/3(Nb0.95Ti0.0625)2 O6 Ceramics

Effects of La on Dielectric and Piezoelectric Properties of Pb1−xLa2x/3(Nb0.95Ti0.0625)2 O6 Ceramics

Characterization of La-Doped PBN Ferroelectric Ceramics

Dual Extraction of Photogenerated Electrons and Holes from a Ferroelectric Sr0.5Ba0.5Nb2O6 Semiconductor

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Effects of La on Dielectric and Piezoelectric Properties of Pb_1−xLa_2x/3(Nb_0.95Ti_0.0625)₂ O₆ Ceramics

Effects of La on Dielectric and Piezoelectric Properties of Pb_1−xLa_2x/3(Nb_0.95Ti_0.0625)₂ O₆ Ceramics

Dual Extraction of Photogenerated Electrons and Holes from a Ferroelectric Sr_0.5Ba_0.5Nb₂O₆ Semiconductor