Phase transition study in PLZT ferroelectric ceramics by mechanical and dielectric spectroscopies

Silva, P.S.; Florêncio, Odila; Botero, Ériton Rodrigo; Eiras, J. A.; Garcia, D.

doi:10.1016/j.msea.2008.09.089

Cited by 13 publications

(5 citation statements)

References 18 publications

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“…6, the maximum in e(T) is shifted for PLZT as compared to PZT. In agreement with earlier reports, 45 not only the temperature of maximum permittivity T m is lowered but also the transition spans a broader temperature range than in PZT. 46 This broadening effect was rationalized with the disruption of long-range order, i.e., the formation of PNRs and their reduction in size with increasing lanthanum content.…”

Section: Discussionsupporting

confidence: 93%

Local structure change evidenced by temperature-dependent elastic measurements: Case study on Bi1/2Na1/2TiO3-based lead-free relaxor piezoceramics

Dittmer

Webber

et al. 2014

Journal of Applied Physics

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Quenching-induced circumvention of integrated aging effect of relaxor lead lanthanum zirconate titanate and (Bi1/2Na1/2)TiO3-BaTiO3 Appl. Phys. Lett. 102, 032901 (2013) (4BZT) is measured with the impulse excitation technique and contrasted with corresponding dielectric and structural data. While the dielectric properties suggest a phase transition, the high resolution XRD patterns remain virtually unchanged from room temperature up to high temperatures, confirming no change in their long-range order. In contrast, the elastic properties indicate a broad and diffuse ferroelastic transition denoted by a minimum in Y(T). By analogy to the elastic and dielectric data of PbZr x Ti 1Àx O 3 and PLZT, it is concluded that 20BKT and 4BZT are relaxors with polar nanoregions embedded in a metrically cubic matrix. Interestingly, no indication for the freezing temperature was reflected in any of the employed measurement techniques. From the saturation of Y(T), it is suggested that the Burns temperature may be approximated as 700 C. Moreover, it is found that the modification with the ternary end-member BiZn 1/2 Ti 1/2 O 3 results in an increase in Young's modulus. A comparison with the Bi 1/2 Na 1/2 TiO 3 -BaTiO 3 -K 0.5 Na 0.5 NbO 3 yields the same results. V C 2014 AIP Publishing LLC.

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Section: Discussionsupporting

confidence: 93%

Local structure change evidenced by temperature-dependent elastic measurements: Case study on Bi1/2Na1/2TiO3-based lead-free relaxor piezoceramics

Dittmer

Webber

et al. 2014

Journal of Applied Physics

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“…Both studies found an additional elastic softening at approximately 150 °C to 160 °C, considerably lower than the temperature at maximum permittivity (∼300 °C). These findings correspond well to previous studies on leadcontaining relaxors [299]. Figure 12 shows the elastic modulus Y relative to the room temperature value Y 1 determined using impulse resonance spectroscopy and the relative permittivity on poled NBT-xBT (x=0.03 and 0.06) samples from room temperature up to 400 °C.…”

Section: Macroscopic Mechanical Constitutive Behavior Of Nbt-supporting

confidence: 89%

Review of the mechanical and fracture behavior of perovskite lead-free ferroelectrics for actuator applications

Webber

Vögler

Khansur

et al. 2017

Smart Mater. Struct.

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There has been considerable progress in the development of large strain lead-free perovskite ferroelectrics over the past decade. Under certain conditions, the electromechanical properties of some compositions now match or even surpass commercially available lead-containing materials over a wide temperature range, making them potentially attractive for non-resonant displacement applications. However, the phenomena responsible for the large unipolar strains and piezoelectric responses can be markedly different to classical ferroelectrics such as Pb(Zr,Ti)O3 and BaTiO3. Despite the promising electromechanical properties, there is little understanding of the mechanical properties and fracture behavior, which is crucial for their implementation into applications where they will be exposed to large electrical, mechanical, and thermal fields. This work discusses and reviews the current understanding of the mechanical behavior of large-strain perovskite lead-free ferroelectrics for use in actuators and provides recommendations for further work in this important field.

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“…The Bi 0.5 Na 0.5 TiO 3 -BaTiO 3 (BNT-BT) solid solution has been considered as a promising and one of the principal candidates for replacements of the PZT. However, some of its basic properties, such as the nature of the phase transitions and the relationship between the electric and mechanic responses [9,10], mainly in the MPB region requires further investigation, which is the purpose of this study. The complementary and supplementary information obtained from loss spectra measured in mechanical spectroscopy [11,12] and dielectric spectroscopy [13,14] is reported in this study.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Phase Transitions in BNT-BT Lead-Free Ceramics Around Morphotropic Phase Boundary by Mechanical and Dielectric Spectroscopies

Silva¹,

Diaz²,

Florêncio³

et al. 2016

Archives of Metallurgy and Materials

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In this work, the syntheses and characterization by mechanical and dielectric spectroscopies of (1-x) Bi0.5Na0.5TiO3-xBaTiO3 (BNT-100xBT), with x = 0.05, 0.06 and 0.07, lead-free piezoelectric ceramics is reported. Ceramic samples of BNT-BT have been prepared by mixed-oxide method and then conventionally sintered. X-ray diffraction patterns of sintered samples, indicated for BNT-7BT the presence of tetragonal (P4mm) complex perovskite structure, whereas for BNT-5BT and BNT-6BT the samples exhibit a mixture of tetragonal (P4mm) and rhombohedral (R3c) crystalline phases, which reveal the presence of a morphotropic phase boundary (MPB) in the BNT-BT system. Measurements of internal friction, Q-1, and the storage modulus, E’, as a function of temperature at various frequencies were carried out in a Dynamic Mechanical Analyzer (DMA), in the temperature range from 0ºC to 600ºC. Dielectric profiles are recorded in the frequency range from 1kHz to 100kHz and the temperature range from room temperature to 475ºC. Mechanical loss spectra obtained for investigated compositions of BNT-BT samples showed different frequency-independent anomalies. Two main anomalies for BNT-5BT and BNT-6BT, observed around 100ºC and 430ºC were associated with the ferroelectric-antiferroelectric and antiferroelectricparaelectric phase transitions, respectively. The results obtained from mechanical loss measurements were supported by dielectric relaxation spectra. For BNT-7BT, outside the MPB, four different frequency-independent processes were observed.

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Phase transition study in PLZT ferroelectric ceramics by mechanical and dielectric spectroscopies

Cited by 13 publications

References 18 publications

Local structure change evidenced by temperature-dependent elastic measurements: Case study on Bi1/2Na1/2TiO3-based lead-free relaxor piezoceramics

Local structure change evidenced by temperature-dependent elastic measurements: Case study on Bi1/2Na1/2TiO3-based lead-free relaxor piezoceramics

Review of the mechanical and fracture behavior of perovskite lead-free ferroelectrics for actuator applications

Analysis of the Phase Transitions in BNT-BT Lead-Free Ceramics Around Morphotropic Phase Boundary by Mechanical and Dielectric Spectroscopies

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