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Shujun Zhang - One of the best experts on this subject based on the ideXlab platform.

  • complete stress induced depolarization of relaxor ferroelectric crystals without transition through a non polar phase
    Applied Physics Letters, 2018
    Co-Authors: Sergey I Shkuratov, Shujun Zhang, Jason Baird, Vladimir G Antipov, Wesley S Hackenberger, Jun Luo, Christopher S Lynch, Jay B Chase, Christopher Roberts
    Abstract:

    The development of relaxor ferroelectric single crystal technology is driven by the ability to tailor ferroelectric properties through Domain engineering not achievable in polycrystalline materials. In this study, three types of Domain-engineered rhombohedral Pb(In1/2Nb1/2)O3–Pb(Mg1/3Nb2/3)O3–PbTiO3 crystals were subjected to transverse high strain rate loading. The experimental results indicate that the Domain Configuration has a significant effect on the stress-induced depolarization and the associated charge released. A complete depolarization of the single-Domain crystals with 3m symmetry is observed, while multiDomain crystals with 4mm and mm2 symmetries retain a fraction of their initial remanent polarization. The complete depolarization of single-Domain crystals is unique without transition to a non-polar phase, with a stress-induced charge density of 0.48 C/m2. This is up to three times higher than that of the multiDomain crystals and PbZrxTi1−xO3 ferroelectric ceramics that are critical for ultrahigh-power transducer applications. The main offering of this work is to propose a detailed mechanism for complete stress-induced depolarization in ferroelectric crystals which does not involve an intermediate transformation to a non-polar phase.The development of relaxor ferroelectric single crystal technology is driven by the ability to tailor ferroelectric properties through Domain engineering not achievable in polycrystalline materials. In this study, three types of Domain-engineered rhombohedral Pb(In1/2Nb1/2)O3–Pb(Mg1/3Nb2/3)O3–PbTiO3 crystals were subjected to transverse high strain rate loading. The experimental results indicate that the Domain Configuration has a significant effect on the stress-induced depolarization and the associated charge released. A complete depolarization of the single-Domain crystals with 3m symmetry is observed, while multiDomain crystals with 4mm and mm2 symmetries retain a fraction of their initial remanent polarization. The complete depolarization of single-Domain crystals is unique without transition to a non-polar phase, with a stress-induced charge density of 0.48 C/m2. This is up to three times higher than that of the multiDomain crystals and PbZrxTi1−xO3 ferroelectric ceramics that are critical for ultra...

  • ultrahigh piezoelectric properties in textured k na nbo3 based lead free ceramics
    Advanced Materials, 2018
    Co-Authors: Peng Li, Shujun Zhang, Jiwei Zhai, Bo Shen, Xiaolong Li, X X Zhang
    Abstract:

    : High-performance lead-free piezoelectric materials are in great demand for next-generation electronic devices to meet the requirement of environmentally sustainable society. Here, ultrahigh piezoelectric properties with piezoelectric coefficients (d33 ≈700 pC N-1 , d33 * ≈980 pm V-1 ) and planar electromechanical coupling factor (kp ≈76%) are achieved in highly textured (K,Na)NbO3 (KNN)-based ceramics. The excellent piezoelectric properties can be explained by the strong anisotropic feature, optimized engineered Domain Configuration in the textured ceramics, and facilitated polarization rotation induced by the intermediate phase. In addition, the nanoDomain structures with decreased Domain wall energy and increased Domain wall mobility also contribute to the ultrahigh piezoelectric properties. This work not only demonstrates the tremendous potential of KNN-based ceramics to replace lead-based piezoelectrics but also provides a good strategy to design high-performance piezoelectrics by controlling appropriate phase and crystallographic orientation.

  • Domain Configuration and thermal stability of k0 48na0 52 nb0 96sb0 04 o3 bi0 50 na0 82k0 18 0 50zro3 piezoceramics with high d33 coefficient
    ACS Applied Materials & Interfaces, 2016
    Co-Authors: Jialiang Zhang, Chaojing Lu, Shujun Zhang
    Abstract:

    The Domain Configuration of lead-free (K0.48Na0.52)(Nb0.96Sb0.04)O3–Bi0.50(Na0.82K0.18)0.50ZrO3 ceramics with rhombohedral–tetragonal morphotropic phase boundary, accounting for the high piezoelectric property and good thermal stability, were systematically studied. Short Domain segments (before poling) and long Domain stripes with wedge-shaped or furcated ends (after poling) were found to be typical Domain Configurations. The reduced elastic energy, lattice distortion, and internal stress, due to the coexistence of rhombohedral and tetragonal phases, result in much easier Domain reorientation and Domain wall motion, responsible for the high piezoelectric properties, being on the order of 460 pC/N, in which the extrinsic contribution from irreversible Domain switching was estimated to be around 50% of the total piezoelectricity. Minor piezoelectric property variations (<6% over a temperature range from −50 to 100 °C) were observed as a function of temperature, showing a good thermal stability. In addition...

  • Domain Configuration and piezoelectric properties of k0 50na0 50 1 xlix nb0 80ta0 20 o3 ceramics
    Journal of The European Ceramic Society, 2014
    Co-Authors: Jialiang Zhang, Chunlei Wang, Shujun Zhang
    Abstract:

    Abstract Domain structure plays an important role in determining piezoelectric properties of ferroelectric materials. However, limited studies have been carried out on the Domains of (K,Na)NbO 3 -based lead free ceramics. The Domain Configuration, Domain reversal behavior and piezoelectric properties of (K 0.50 Na 0.50 ) 1− x Li x (Nb 0.80 Ta 0.20 )O 3 (KNN-Li x ) ceramics with x  = 0.02, 0.035 and 0.05, were studied in this research. It was observed that ceramics with different phases show distinctly different Domain Configurations and Domain reversal behaviors. When compared to other two compositions, x  = 0.035 with coexistent orthorhombic-tetragonal phases at room temperature was found to possess curved Domain stripes and larger average Domain width, leading to optimal piezoelectric properties with d 33 * = 260 pm/V and k p  = 48%. Based on the microstructures, polarization hysteresis loops and unipolar strain curves under high electric field, it was concluded that the larger Domain size and easier Domain switching are due to the coexistence of orthorhombic and tetragonal phases, account for the improved properties in KNNT-Li 0.035 ceramics.

Longtu Li - One of the best experts on this subject based on the ideXlab platform.

  • inverted electro mechanical behaviour induced by the irreversible Domain Configuration transformation in k na nbo3 based ceramics
    Scientific Reports, 2016
    Co-Authors: Yu Huan, Xiaohui Wang, Jurij Koruza, Ke Wang, Kyle G Webber, Longtu Li
    Abstract:

    Miniaturization of Domains to the nanometer scale has been previously reported in many piezoelectrics with two-phase coexistence. Despite the observation of nanoscale Domain Configuration near the polymorphic phase transition (PPT) regionin virgin (K0.5Na0.5)NbO3 (KNN) based ceramics, it remains unclear how this Domain state responds to external loads and influences the macroscopic electro-mechanical properties. To this end, the electric-field-induced and stress-induced strain curves of KNN-based ceramics over a wide compositional range across PPT were characterized. It was found that the coercive field of the virgin samples was highest in PPT region, which was related to the inhibited Domain wall motion due to the presence of nanoDomains. However, the coercive field was found to be the lowest in the PPT region after electrical poling. This was related to the irreversible transformation of the nanoDomains into micron-sized Domains during the poling process. With the similar micron-sized Domain Configuration for all poled ceramics, the Domains in the PPT region move more easily due to the additional polarization vectors. The results demonstrate that the poling process can give rise to the irreversible Domain Configuration transformation and then account for the inverted macroscopic piezoelectricity in the PPT region of KNN-based ceramics.

  • strong Domain Configuration dependence of the nonlinear dielectric response in k na nbo3 based ceramics
    Applied Physics Letters, 2015
    Co-Authors: Yu Huan, Xiaohui Wang, Longtu Li, Jurij Koruza
    Abstract:

    The nonlinear dielectric response in (Na0.52K0.4425Li0.0375)(Nb0.92−xTaxSb0.08)O3 ceramics with different amounts of Ta was measured using subcoercive electric fields and quantified by the Rayleigh model. The irreversible extrinsic contribution, mainly caused by the irreversible Domain wall translation, was strongly dependent on the Domain Configuration. The irreversible extrinsic contributions remained approximately the same within the single-phase regions, either orthorhombic or tetragonal, due to the similar Domain morphology. However, in the polymorphic phase transition region, the Domain wall density was increased by minimized Domain size, as observed by transmission electron microscopy. This resulted in constrained Domain wall motion due to self-clamping and reduced the irreversible extrinsic contribution.

  • grain size effects on piezoelectric properties and Domain structure of batio3 ceramics prepared by two step sintering
    Journal of the American Ceramic Society, 2013
    Co-Authors: Yu Huan, Xiaohui Wang, Jian Fang, Longtu Li
    Abstract:

    A series of highly dense barium titanate (BaTiO3) ceramics with the average grain size (GS) from 0.29 to 8.61 μm are successfully prepared by two-step sintering, and the GS effect on piezoelectric coefficient (d33) is systematically discussed in this work. It is found that when GS above 1 μm, d33 can be enhanced with decreasing GS, reaching a maximum value of 519 pC/N around 1 μm due to the high activity of Domain wall mobility. Subsequently, d33 rapidly drops with a further decrease in GS owing to the reduced Domain density. The results suggest that it is possible to prepare high-performance BaTiO3 ceramics by controlling the GS and Domain Configuration properly, which brings great revitalization to the BaTiO3-based piezoceramics.

  • evaluation of Domain wall motion during polymorphic phase transition in k na nbo3 based piezoelectric ceramics by nonlinear response measurements
    Journal of Applied Physics, 2011
    Co-Authors: Bin Peng, Longtu Li
    Abstract:

    Based on the investigation of the nonlinear dielectric response of 0.95(K0.5Na0.5)NbO3-0.05LiTaO3 (KNN-0.05LT) piezoelectric ceramics, the contribution of irreversible Domain wall movement to the dielectric constant with increasing temperature were quantitatively evaluated. Rayleigh law reasonably interpreted these nonlinear dielectric behaviors and successfully separated the contribution of irreversible Domain walls movement from the macroscopic dielectric properties. The extrinsic contribution from irreversible Domain wall movement, denoted by the Rayleigh coefficient (α), undergoes an abrupt decline during the polymorphic phase transition due to the change of the crystal structure and the Domain Configuration. The dielectric nonlinearity is significantly reduced in the tetragonal phase zone after the polymorphic phase transition. Furthermore, the tetragonal phase is more stable than the orthorhombic phase.

H Fuess - One of the best experts on this subject based on the ideXlab platform.

  • the impact of heat treatment on the Domain Configuration and strain behavior in pb zr ti o3 ferroelectrics
    Journal of the American Ceramic Society, 2015
    Co-Authors: Ljubomira Ana Schmitt, Hans Kungl, Michael J Hoffmann, Manuel Hinterstein, Lars Riekehr, Hansjoachim Kleebe, Rudigera Eichel, H Fuess
    Abstract:

    The influence of heat treatment in lead zirconate titanate Pb(Zr,Ti)O3 (PZT) ferroelectrics on the Domain structure and strain behavior has been investigated. Temperature-induced changes in the Domain Configuration, for example, appearance of nanoDomains within microDomains, were observed by in situ hot-stage transmission electron microscopy. During the transient post annealing state the strain behavior under electric field differed from that of the nonheat-treated ferroelectrics. Directly after cooling the difference was most pronounced and decreased as a function of time. The enhanced response to an electric field of 4 kV/mm resulted in qualitatively different effects on strain for PZT from the tetragonal side and from the rhombohedral side of the morphotropic phase boundary.

  • composition dependence of the Domain Configuration and size in pb zr1 xtix o3 ceramics
    Journal of Applied Physics, 2007
    Co-Authors: Ljubomira Ana Schmitt, Kristin A Schonau, R Theissmann, H Fuess, Hans Kungl, Michael J Hoffmann
    Abstract:

    The composition dependent variation of Domain Configuration and size in Pb(Zr1−xTix)O3 (PZT) has been investigated in a detailed transmission electron microscopy study in the range of 0.40⩽x⩽0.55. Single phase composition, Pb(Zr0.45Ti0.55)O3 and Pb(Zr0.60Ti0.40)O3, the former belonging to the tetragonal, the latter to the rhombohedral phase, feature small microDomain widths coupled with a pronounced bimodal Domain distribution. Samples with compositions around the morphotropic phase boundary exhibit a decrease of bimodal distribution and an increase in microDomain width associated with nanoDomain formation. The investigation of micro- and nanoDomains, as well as the bimodal distribution of microDomains in undoped PZT ceramics, with respect to composition, is reported. We define nanoDomains as “Domains arranged within microDomains possessing a width of a few nanometers.” The strict alternation of the two orientation variants of microDomains is denoted as “bimodal Domain distribution,” and is characterized ...

Seungeek Park - One of the best experts on this subject based on the ideXlab platform.

  • Domain Configuration and crystal structure of pb zn1 3nb2 3 o3 5 pbtio3 crystals as a function of the electric field direction
    Journal of Applied Physics, 2002
    Co-Authors: Jae Yun Yi, Kug Sun Hong, Seungeek Park, Jorge Millan
    Abstract:

    The Domain Configuration of 0.95Pb(Zn1/3Nb2/3)O3–0.05PbTiO3 single crystals was investigated as a function of the applied electric-field direction with respect to the crystallographic orientation. A normal ferroelectric Domain structure, which was not observable in virgin crystals (not exposed to electric field), appeared upon the electric-field (E-field) induced transition from the relaxor state to the normal ferroelectric state. After E-field was applied along the polar 〈111〉 direction and removed, a band-shaped Domain Configuration appeared as a result of subsequent depolarization. The depoled 〈111〉 crystal consisted of predominantly (110) Domain boundaries, which represents the minimum energy Domain state in rhombohedral ferroelectrics. In contrast, crystals must transform into the phase with the symmetry lower than rhombohedral, i.e., monoclinic structure, by an E-field application along 〈001〉. Domain boundaries in 〈001〉 poled crystals were indexed to be (001), being a favorable state for monoclinic ...

  • polarization rotation via a monoclinic phase in the piezoelectric 92 pbzn1 3nb2 3o3 8 pbtio3
    Physical Review Letters, 2001
    Co-Authors: Beatriz Noheda, Seungeek Park, L E Cross, D E Cox, G Shirane, Z Zhong
    Abstract:

    The origin of ultrahigh piezoelectricity in the relaxor ferroelectric PbZn(1/3)Nb(2/3)O3-PbTiO3 was studied with an electric field applied along the [001] direction. The zero-field rhombohedral R phase starts to follow the direct polarization path to tetragonal symmetry via an intermediate monoclinic M phase, but then jumps irreversibly to an alternate path involving a different type of monoclinic distortion. Details of the structure and Domain Configuration of this novel phase are described. This result suggests that there is a nearby R-M phase boundary as found in the Pb(Ti,Zr)O3 system.

  • engineered Domain Configuration in rhombohedral pzn pt single crystals and their ferroelectric related properties
    Ferroelectrics, 1999
    Co-Authors: Satoshi Wada, Seungeek Park, L E Cross, Thomas R Shrout
    Abstract:

    Abstract The Domain Configuration of rhombohedral PZN-8%PT single crystals has been observed as a function of electric-field and crystallographic orientation using polarizing microscope. Although a single Domain state could be achieved by applying an E-field along the rhombohedral polar direction [111], a multiDomain state was observed with the removal of the E-field. This Domain instability was associated with large hysteresis of the strain vs. E-field behavior. In contrast, an engineered Domain Configuration of [001] oriented rhombohedral crystals was found to be stable with no Domain motion detectable under DC-bias, resulting in hysteresis minimized strain vs. E-field behavior. The stable engineered Domain Configuration under bias in multiDomain [001] oriented crystals was suggested as an evidence of macroscopic symmetry 4mm out of 3m rhombohedral crystals.

  • electric field induced phase transition of antiferroelectric lead lanthanum zirconate titanate stannate ceramics
    Journal of Applied Physics, 1997
    Co-Authors: Seungeek Park, Mingjen Pan, Kelley Markowski, Shoko Yoshikawa, Eric L Cross
    Abstract:

    The electric field induced phase transition behavior of lead lanthanum zirconate titanate stannate (PLZTS) ceramics was investigated. PLZTS undergoes a tetragonal antiferroelectric (AFETet) to rhombohedral ferroelectric (FERh) phase transition with the application of an electric field. The volume increase associated with this antiferroelectric (AFE)–ferroelectric (FE) phase transition plays an important role with respect to actuator applications. This volume increase involves an increase in both transverse and longitudinal strains. The E field at which the transverse strain increases is accompanied by an abrupt jump in polarization. The longitudinal strain, however, lags behind this polarization jump exhibiting a slight decrease at the onset of phase switching. This decoupling was related to the preferentially oriented AFE Domain Configuration, with its tetragonal c-axis perpendicular to the applied electric field. It is suggested that phase switching involves multiple steps involving both structural tran...

Yu Huan - One of the best experts on this subject based on the ideXlab platform.

  • inverted electro mechanical behaviour induced by the irreversible Domain Configuration transformation in k na nbo3 based ceramics
    Scientific Reports, 2016
    Co-Authors: Yu Huan, Xiaohui Wang, Jurij Koruza, Ke Wang, Kyle G Webber, Longtu Li
    Abstract:

    Miniaturization of Domains to the nanometer scale has been previously reported in many piezoelectrics with two-phase coexistence. Despite the observation of nanoscale Domain Configuration near the polymorphic phase transition (PPT) regionin virgin (K0.5Na0.5)NbO3 (KNN) based ceramics, it remains unclear how this Domain state responds to external loads and influences the macroscopic electro-mechanical properties. To this end, the electric-field-induced and stress-induced strain curves of KNN-based ceramics over a wide compositional range across PPT were characterized. It was found that the coercive field of the virgin samples was highest in PPT region, which was related to the inhibited Domain wall motion due to the presence of nanoDomains. However, the coercive field was found to be the lowest in the PPT region after electrical poling. This was related to the irreversible transformation of the nanoDomains into micron-sized Domains during the poling process. With the similar micron-sized Domain Configuration for all poled ceramics, the Domains in the PPT region move more easily due to the additional polarization vectors. The results demonstrate that the poling process can give rise to the irreversible Domain Configuration transformation and then account for the inverted macroscopic piezoelectricity in the PPT region of KNN-based ceramics.

  • strong Domain Configuration dependence of the nonlinear dielectric response in k na nbo3 based ceramics
    Applied Physics Letters, 2015
    Co-Authors: Yu Huan, Xiaohui Wang, Longtu Li, Jurij Koruza
    Abstract:

    The nonlinear dielectric response in (Na0.52K0.4425Li0.0375)(Nb0.92−xTaxSb0.08)O3 ceramics with different amounts of Ta was measured using subcoercive electric fields and quantified by the Rayleigh model. The irreversible extrinsic contribution, mainly caused by the irreversible Domain wall translation, was strongly dependent on the Domain Configuration. The irreversible extrinsic contributions remained approximately the same within the single-phase regions, either orthorhombic or tetragonal, due to the similar Domain morphology. However, in the polymorphic phase transition region, the Domain wall density was increased by minimized Domain size, as observed by transmission electron microscopy. This resulted in constrained Domain wall motion due to self-clamping and reduced the irreversible extrinsic contribution.

  • grain size effects on piezoelectric properties and Domain structure of batio3 ceramics prepared by two step sintering
    Journal of the American Ceramic Society, 2013
    Co-Authors: Yu Huan, Xiaohui Wang, Jian Fang, Longtu Li
    Abstract:

    A series of highly dense barium titanate (BaTiO3) ceramics with the average grain size (GS) from 0.29 to 8.61 μm are successfully prepared by two-step sintering, and the GS effect on piezoelectric coefficient (d33) is systematically discussed in this work. It is found that when GS above 1 μm, d33 can be enhanced with decreasing GS, reaching a maximum value of 519 pC/N around 1 μm due to the high activity of Domain wall mobility. Subsequently, d33 rapidly drops with a further decrease in GS owing to the reduced Domain density. The results suggest that it is possible to prepare high-performance BaTiO3 ceramics by controlling the GS and Domain Configuration properly, which brings great revitalization to the BaTiO3-based piezoceramics.