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  • Online-Ressource  (9)
  • AIP Publishing  (9)
  • Ding, Xiangdong  (9)
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  • Online-Ressource  (9)
Verlag/Herausgeber
  • AIP Publishing  (9)
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  • 1
    Online-Ressource
    Online-Ressource
    Ferroelectric, elastic, piezoelectric, and dielectric properties of Ba(Ti0.7Zr0.3)O3- x (Ba0.82Ca0.18)TiO3 Pb-free ceramics
    AIP Publishing ; 2017
    In:  Journal of Applied Physics Vol. 122, No. 4 ( 2017-07-28)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 122, No. 4 ( 2017-07-28)
    Kurzfassung: We designed and synthesized a pseudo-binary Pb-free system, Ba(Ti0.7Zr0.3)O3-x(Ba0.82Ca0.18)TiO3, by combining a rhombohedral end (with only cubic to rhombohedral ferroelectric phase transition) and a tetragonal end (with only cubic to tetragonal ferroelectric phase transition). The established composition-temperature phase diagram is characterized by a tricritical point type morphotropic phase boundary (MPB), and the MPB composition has better ferroelectric, piezoelectric, and dielectric properties than the compositions deviating from MPB. Moreover, a full set of material constants (including elastic stiffness constants, elastic compliance constants, piezoelectric constants, dielectric constants, and electromechanical coupling factors) of the MPB composition are determined using a resonance method. The good piezoelectric performance of the MPB composition can be ascribed to the high dielectric constants, elastic softening, and large electromechanical coupling factor.
    Materialart: Online-Ressource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.4996353
    Sprache: Englisch
    Verlag: AIP Publishing
    Publikationsdatum: 2017
    ZDB Id: 220641-9
    ZDB Id: 3112-4
    ZDB Id: 1476463-5
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    Online-Ressource
  • 2
    Online-Ressource
    Online-Ressource
    Acoustic emission study on avalanche dynamics of ferroelectric switching in lead zirconate titanate ceramics
    AIP Publishing ; 2022
    In:  Journal of Applied Physics Vol. 132, No. 22 ( 2022-12-14)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 132, No. 22 ( 2022-12-14)
    Kurzfassung: The avalanche dynamics of ferroelectric switching in lead zirconate titanate ceramics was investigated using acoustic emission. Two distinct power-law regimes for ferroelectric switching events were identified by an anomaly in the histogram of probability density, in contrast to the single power-law behavior observed in BaTiO3 single crystals. Such an anomaly is ascribed to the different minimum cut-offs of two power-law distributions. The critical energy exponents were determined to be 1.25 ± 0.10 for energies & lt;103 aJ and 1.51 ± 0.14 for energies & gt;103 aJ. The events in both regimes can be attributed to the depinning of domain walls from two distinct types of defects. The events in the lower energy regime are associated with domain wall junctions due to long-range electric and elastic interactions, whereas the latter is related to extrinsic defects, such as vacancies and dislocations. Moreover, for both regions, the rate of aftershocks follows the Omori power-law, indicating the same critical temporal correlations between the avalanches.
    Materialart: Online-Ressource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/5.0126308
    Sprache: Englisch
    Verlag: AIP Publishing
    Publikationsdatum: 2022
    ZDB Id: 220641-9
    ZDB Id: 3112-4
    ZDB Id: 1476463-5
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    Online-Ressource
  • 3
    Online-Ressource
    Online-Ressource
    Avalanche dynamics of ferroelectric phase transitions in BaTiO3 and 0.7Pb(Mg2∕3Nb1∕3)O3-0.3PbTiO3 single crystals
    AIP Publishing ; 2019
    In:  Applied Physics Letters Vol. 115, No. 2 ( 2019-07-08)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 115, No. 2 ( 2019-07-08)
    Kurzfassung: The motion of phase fronts during a ferroelectric phase transition is intermittent and follows avalanche dynamics. In the present study, we show that an intermittent propagation mode generates spikes of depolarization currents at an extremely slow heating rate of 0.05 K/min in BaTiO3 (BTO) and 0.7Pb(Mg2∕3Nb1∕3)O3-0.3PbTiO3 (PMN-PT) single crystals. Such “jerks” are indicative of avalanche dynamics, and their energy exhibits a power law distribution with exponents of ε = 1.3 ± 0.10 and ε = 1.5 ± 0.10 for BTO and PMN-PT, respectively. The rate of aftershocks after big events decays as an Omori-like power-law and interevent times are characterized by a universal double power-law distribution, indicating the critical temporal correlations between the avalanche events.
    Materialart: Online-Ressource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.5099212
    RVK:
    UA 1000
    Sprache: Englisch
    Verlag: AIP Publishing
    Publikationsdatum: 2019
    ZDB Id: 211245-0
    ZDB Id: 1469436-0
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    Online-Ressource
  • 4
    Online-Ressource
    Online-Ressource
    Phase transitions and phase diagram of Ba(Zr 0.2 Ti 0.8 )O 3 - x (Ba 0.7 Ca 0.3 )TiO 3 Pb-free system by anelastic measurement
    AIP Publishing ; 2015
    In:  Journal of Applied Physics Vol. 117, No. 12 ( 2015-03-28), p. 124107-
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 117, No. 12 ( 2015-03-28), p. 124107-
    Materialart: Online-Ressource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.4916713
    Sprache: Englisch
    Verlag: AIP Publishing
    Publikationsdatum: 2015
    ZDB Id: 220641-9
    ZDB Id: 3112-4
    ZDB Id: 1476463-5
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  • 5
    Online-Ressource
    Online-Ressource
    History dependence of avalanche dynamics of ferroelectric phase transition in BaTiO3 under external bias field
    AIP Publishing ; 2023
    In:  Applied Physics Letters Vol. 122, No. 2 ( 2023-01-09)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 122, No. 2 ( 2023-01-09)
    Kurzfassung: A ferroelectric phase transition under an external bias electric field after field cooling and zero field cooling in barium titanate single crystals shows scale invariant nucleation and growth of complex domain structures. The avalanche energy exponents vary with the external bias, depending on the cooling history of the sample under applied field or zero field cooling. After field cooling, resulting in a single domain sample, the energy exponent is near the integrated mean field value of 5/3, namely, 1.68 ± 0.022. The sample after field cooling shows the same exponent with an external bias electric field range of up to 4.5 kV/cm. The exponent of a multi-domain sample, after zero field cooling, decreases from ε = 1.85 to the fixed point of 1.66 under high fields. The different behavior is attributed to the greater complexity of domain patterns in the multi-domain sample, which reduces to a single domain state under strong applied fields. Compared with the single-domain state, the multi-domain state has more domain boundaries and the intersections formed by these domain boundaries. These domain boundaries and their intersections will hinder the movement of the phase boundary and act as a pinning effect on the front of the phase interface. The effect is to generate more small energy signals, making the critical exponent high. At the same time, the aftershock time distribution (Omori law) remains the same for all switching conditions with an Omori exponent near −1 and switching time correlations of −1 ± 0.05 for short times ( & lt;1 s) and −2 ± 0.10 for long times ( & gt;1 s).
    Materialart: Online-Ressource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/5.0133020
    RVK:
    UA 1000
    Sprache: Englisch
    Verlag: AIP Publishing
    Publikationsdatum: 2023
    ZDB Id: 211245-0
    ZDB Id: 1469436-0
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    Online-Ressource
  • 6
    Online-Ressource
    Online-Ressource
    Anisotropic avalanche dynamics during ferroelectric switching in BaTiO3 and 0.7Pb(Mg2/3Nb1/3)O3–0.3PbTiO3
    AIP Publishing ; 2020
    In:  Applied Physics Letters Vol. 117, No. 17 ( 2020-10-26)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 117, No. 17 ( 2020-10-26)
    Kurzfassung: A ferroelectric hysteresis depends on the orientation of the applied field with respect to the spontaneous polarization. The ferroelectric switching occurs through correlated domain movements forming avalanches. We tested whether avalanches in single crystals of the prototypic ferroelectric BaTiO3 and the relaxor ferroelectric 0.7Pb(Mg2/3Nb1/3)O3–0.3PbTiO3 show anisotropic field dependences. The anisotropy of the energy exponent of avalanches is very small in BaTiO3 with exponents between 1.53 and 1.6, which is remarkably close to the prediction of mean field theory 5/3. The anisotropy is much stronger in 0.7Pb(Mg2/3Nb1/3)O3–0.3PbTiO3 with one exponent slightly above the typical range of mean field values (4/3–5/3): 1.43 ± 0.02, 1.64 ± 0.03, and 1.79 ± 0.03 for fields along [100], [110] , and [111], respectively. This anisotropy indicates a variation of the fractal dimensions of the transient domain patterns depending on the direction of the switching field.
    Materialart: Online-Ressource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/5.0027752
    RVK:
    UA 1000
    Sprache: Englisch
    Verlag: AIP Publishing
    Publikationsdatum: 2020
    ZDB Id: 211245-0
    ZDB Id: 1469436-0
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    Online-Ressource
  • 7
    Online-Ressource
    Online-Ressource
    High temperature strain glass in Ti50(Pd50−xCrx) alloy and the associated shape memory effect and superelasticity
    AIP Publishing ; 2009
    In:  Applied Physics Letters Vol. 95, No. 15 ( 2009-10-12)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 95, No. 15 ( 2009-10-12)
    Kurzfassung: Strain glass has recently been reported in Ti50−xNi50+x (x≥1.5 at %) alloys and caused by the existence of point defects. This strain glass alloy, being nonmartensitic, exhibits shape memory effect (SME) and superelasticity (SE) around the freezing temperature T0. However, the T0 of Ti50−xNi50+x (x≥1.5 at %) strain glass alloy is very low (∼160 K), thus restricting its potential applications. In the present letter, we report a strain glass system, Ti50(Pd50−xCrx) (x≥9 at %), which has a significantly higher freezing temperature. It is based on a high-temperature martensitic system TiPd (with Ms∼810 K) and dopant Cr (as point defect). For Ti50(Pd40Cr10) strain glass, the freezing transition occurs at T0∼250 K, being close to the room temperature. Correspondingly, it exhibits SME and SE around its high T0. We further clarified that T0 of strain glass alloy is controlled by the martensitic transformation temperature Ms (i.e., martensite stability) of its corresponding host alloy without point defect. Our work provides insight into how to develop strain glass with desired T0 and the associated SME and SE for applications.
    Materialart: Online-Ressource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.3249580
    RVK:
    UA 1000
    Sprache: Englisch
    Verlag: AIP Publishing
    Publikationsdatum: 2009
    ZDB Id: 211245-0
    ZDB Id: 1469436-0
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  • 8
    Online-Ressource
    Online-Ressource
    Material descriptors for morphotropic phase boundary curvature in lead-free piezoelectrics
    AIP Publishing ; 2017
    In:  Applied Physics Letters Vol. 111, No. 3 ( 2017-07-17)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 111, No. 3 ( 2017-07-17)
    Kurzfassung: An important aspect of searching for alternatives to the current piezoelectric workhorse PZT (PbZrxTi1−xO3) is to establish a vertical morphotropic phase boundary (MPB) in the composition-temperature phase diagram. However, the MPBs in most lead-free piezoelectrics, especially the BaTiO3-based piezoelectrics, are not as vertical as that of PZT, resulting in serious temperature dependence of piezoelectric and dielectric properties. We investigate the dependence of the verticality of the MPB on polarization and strain related design descriptors in BaTiO3-based and Pb-based systems. We find that the slope of the MPB decreases monotonically with the unit cell volume ratio of the tetragonal (T) and rhombohedral (R) ends; however, it increases with the ionic displacement ratio of the two ends. As the above two descriptors are not straight forward to access as a priori information, two parameters that relate to the atomic size and effective nuclear charge are introduced to enable an effective search for a desired MPB slope. Our study thus provides potential selection rules for developing Pb-free piezoelectrics with high temperature reliability.
    Materialart: Online-Ressource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.4990955
    RVK:
    UA 1000
    Sprache: Englisch
    Verlag: AIP Publishing
    Publikationsdatum: 2017
    ZDB Id: 211245-0
    ZDB Id: 1469436-0
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  • 9
    Online-Ressource
    Online-Ressource
    Role of uncertainty estimation in accelerating materials development via active learning
    AIP Publishing ; 2020
    In:  Journal of Applied Physics Vol. 128, No. 1 ( 2020-07-07)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 128, No. 1 ( 2020-07-07)
    Kurzfassung: An active learning strategy using sampling based on uncertainties shows the promise of accelerating the development of new materials. We study the efficiencies of the active learning iteration loop with different uncertainty estimators to find the “best” material in four different experimental datasets. We use a bootstrap approach aggregating with support vector regression as the base learner to obtain uncertainties associated with model predictions. If the bootstrap replicate number B is small, the variance estimated by the empirical standard error estimator is found to be close to the true variance, whereas the jackknife based estimators give an upward or downward biased estimation of variance. As B increases, the bias of the jackknife based estimators decreases and the variance estimated finally converges to the true one. Therefore, the empirical standard error estimator needs the least number of iteration loops to find the best material in the datasets, especially when the bootstrap replicate number B is small. Our work demonstrates that an appropriate Bootstrap replicate B is conducive to minimizing calculation costs during the materials property optimization by active learning.
    Materialart: Online-Ressource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/5.0012405
    Sprache: Englisch
    Verlag: AIP Publishing
    Publikationsdatum: 2020
    ZDB Id: 220641-9
    ZDB Id: 3112-4
    ZDB Id: 1476463-5
    Standort Signatur Einschränkungen Verfügbarkeit
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