Quenching-induced circumvention of integrated aging effect of relaxor lead lanthanum zirconate titanate and (Bi1/2Na1/2)TiO3-BaTiO3

Zang, Jiadong; Jo, Wook; Rödel, Jürgen

doi:10.1063/1.4788932

Cited by 27 publications

(10 citation statements)

References 18 publications

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“…The unpoled curves from all samples are similar in shape, exhibiting a broad maximum in the dielectric permittivity close to 300°C and a low‐temperature shoulder. It was proposed recently that these two anomalies arise from the presence of two types of polar nanoregions . Poling the samples by applying an electric field of 4 kV/mm at room temperature for 5 min changes the shape of the curves significantly.…”

Section: Resultsmentioning

confidence: 99%

Tailoring Strain Properties of (0.94−x)Bi_1/2Na_1/2TiO₃–0.06BaTiO₃–xK_0.5Na_0.5NbO₃ Ferroelectric/Relaxor Composites

Groh

Rödel

2014

J. Am. Ceram. Soc.

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A remarkable progress in the quest of lead‐free piezoceramics for actuator applications has been made with the development of incipient piezoceramics featured by giant strains. A drawback, however, is the high electric field required to generate this giant strain. A powerful approach to overcoming this drawback lies in relaxor/ferroelectric (FE) composites comprised such giant strain materials (matrix) and a FE or nonergodic relaxor (seed). In this study, we investigate the effect of K0.5Na0.5NbO3 content in the matrix and the volume ratio of seed to matrix using composites of 0.93Bi1/2Na1/2TiO3–0.07BaTiO3 as a seed and (0.94 − x)Bi1/2Na1/2TiO3–0.06BaTiO3–xK0.5Na0.5NbO3 as a matrix. The strain of all matrices, independent of their K0.5Na0.5NbO3 content, was found to be enhanced by adding a certain amount of seed. An optimum strain is achieved for the composite comprised of a matrix with x = 0.02 K0.5Na0.5NbO3 and 10% seed. By means of a differential analysis on the temperature‐dependent dielectric permittivity, it was shown that the seed phase is still present in the composites despite the naturally expected diffusion process during sintering.

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Section: Resultsmentioning

confidence: 99%

Tailoring Strain Properties of (0.94−x)Bi_1/2Na_1/2TiO₃–0.06BaTiO₃–xK_0.5Na_0.5NbO₃ Ferroelectric/Relaxor Composites

Groh

Rödel

2014

J. Am. Ceram. Soc.

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“…The in situ time-dependent XRD profiles for BNT–5BT at 70 °C (figure 7(c) inset) shows that the gradual development of long-range ordering domains, especially in the initial 2 h, were consistent with the time period of the modulus valleys. After the ‘stepwise increase’, the modulus becomes saturated with time evolution, indicating that the isothermal transition is nearly complete and an ageing effect becomes dominant [50–53]. …”

Section: Resultsmentioning

confidence: 99%

Evolution of the tetragonal to rhombohedral transition in (1 − x)(Bi_1/2Na_1/2)TiO₃ − xBaTiO₃ (x ≤ 7%)

Yao

Sun

et al. 2013

Science and Technology of Advanced Materials

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(1 − x)(Bi1/2Na1/2)TiO3 − xBaTiO3 has been the most studied Pb-free piezoelectric material in the last decade; however, puzzles still remain about its phase transitions, especially around the important morphotropic phase boundary (MPB). By introducing the strain glass transition concept from the ferroelastic field, it was found that the phase transition from tetragonal (T, P4bm) to rhombohedral (R, R3c) was affected by a strain glass transition at higher temperature for x ≽ 4%. In these compositions, the T–R transition was delayed or even totally suppressed and displayed huge thermal hysteresis upon cooling and heating. Also, isothermal phase transitions were predicted and realized successfully in the crossover region, where the interaction between the T–R transition and the strain glass transition was strong. Our results revealed the strain glass nature in compositions around the MPB in this important material, and also provide new clues for understanding the transition complexity in other (Bi1/2Na1/2)TiO3-based Pb-free piezoelectric materials.

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“…Studies have shown that the dielectric permittivity profiles are best‐fitted by assuming multi‐Debye relaxation or at least more than one relaxation mechanism . The coexistence of frozen and dynamic PNRs as well as PNRs with different symmetries have also been proposed. These models have been supported by identifying all the contributing mechanisms to the temperature‐dependent permittivity based on peak deconvolution techniques .…”

Section: Introductionmentioning

confidence: 99%

A model delineating the dielectric spectra of a relaxor PLZT obtained by impedance analyzer

Hong

2017

J Am Ceram Soc

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The origin of the dielectric responses of relaxor ferroelectrics, featured by a signal dispersion according to the measurement frequency, were investigated systematically using a canonical relaxor Pb 0.92 La 0.08 (Zr 0.65 Ti 0.35 ) 0.98 O 3 (PLZT 8/65/35) ceramic. By scanning complex dielectric permittivity over a frequency range from 10 mHz to 10 MHz as a function of temperature from 0°C to 100°C, we revealed that the complex dielectric permittivity spectra obtained from an impedance analyzer are a consequence of a convolution of at least three distinct relaxation processes, featured by the unique relaxation time and distribution. The complex dielectric permittivity spectra at each measurement temperature were deconvoluted by the application of a series of Havriliak-Negami relaxation models, resulting in three distinguished processes; namely, slow, intermediate, and fast process. We identified that the fast process is responsible for the overall magnitude of capacitance with little influence on the dielectric loss, the intermediate mainly for the thermal evolution of the capacitance, and the slow mainly for the thermal evolution of the loss. With this model, we successfully rationalized the characteristics of the relaxor behavior such as the frequency dispersion of the dielectric maxima, the disparity in peak positions of real and imaginary parts, and the unique feature during aging, so-called a "dip." K E Y W O R D S dielectric spectroscopy, PLZT, polar nanoregions, relaxor ferroelectrics

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Quenching-induced circumvention of integrated aging effect of relaxor lead lanthanum zirconate titanate and (Bi1/2Na1/2)TiO3-BaTiO3

Abstract: Articles you may be interested inElectric-field-temperature phase diagram of the ferroelectric relaxor system (1−x)Bi1/2Na1/2TiO3−xBaTiO3 doped with manganese

Cited by 27 publications

References 18 publications

Tailoring Strain Properties of (0.94−x)Bi_1/2Na_1/2TiO₃–0.06BaTiO₃–xK_0.5Na_0.5NbO₃ Ferroelectric/Relaxor Composites

Tailoring Strain Properties of (0.94−x)Bi_1/2Na_1/2TiO₃–0.06BaTiO₃–xK_0.5Na_0.5NbO₃ Ferroelectric/Relaxor Composites

Evolution of the tetragonal to rhombohedral transition in (1 − x)(Bi_1/2Na_1/2)TiO₃ − xBaTiO₃ (x ≤ 7%)

A model delineating the dielectric spectra of a relaxor PLZT obtained by impedance analyzer

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Quenching-induced circumvention of integrated aging effect of relaxor lead lanthanum zirconate titanate and (Bi1/2Na1/2)TiO3-BaTiO3

Abstract: Articles you may be interested inElectric-field-temperature phase diagram of the ferroelectric relaxor system (1−x)Bi1/2Na1/2TiO3−xBaTiO3 doped with manganese

Cited by 27 publications

References 18 publications

Tailoring Strain Properties of (0.94−x)Bi1/2Na1/2TiO3–0.06BaTiO3–xK0.5Na0.5NbO3 Ferroelectric/Relaxor Composites

Tailoring Strain Properties of (0.94−x)Bi1/2Na1/2TiO3–0.06BaTiO3–xK0.5Na0.5NbO3 Ferroelectric/Relaxor Composites

Evolution of the tetragonal to rhombohedral transition in (1 − x)(Bi1/2Na1/2)TiO3 − xBaTiO3 (x ≤ 7%)

A model delineating the dielectric spectra of a relaxor PLZT obtained by impedance analyzer

Contact Info

Product

Resources

About

Tailoring Strain Properties of (0.94−x)Bi_1/2Na_1/2TiO₃–0.06BaTiO₃–xK_0.5Na_0.5NbO₃ Ferroelectric/Relaxor Composites

Tailoring Strain Properties of (0.94−x)Bi_1/2Na_1/2TiO₃–0.06BaTiO₃–xK_0.5Na_0.5NbO₃ Ferroelectric/Relaxor Composites

Evolution of the tetragonal to rhombohedral transition in (1 − x)(Bi_1/2Na_1/2)TiO₃ − xBaTiO₃ (x ≤ 7%)