Effect of A-site La and Ba doping on threshold field and characteristic temperatures of PbSc0.5Ta0.5O3 relaxor studied by acoustic emission

Dul’kin, E.; Mihailova, Boriana; Gospodinov, M.; Roth, M.

doi:10.1063/1.4752400

Cited by 20 publications

(32 citation statements)

References 39 publications

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“…Accordingly, T c of Ba 0.67 Sr 0.33 TiO 3 ceramic, for example, is known not to exhibit any frequency dispersion , characteristic of ordered FEs. However, Ba 0.6 Sr 0.4 TiO 3 ceramics exhibit the nontrivial behavior of its T c in dependence on external electric field E , characteristic for RFEs . In addition, recently both T * and T d were detected in Ba 0.60 Sr 0.40 TiO 3 compound using AE .…”

Section: Introductionmentioning

confidence: 98%

Relaxor–ferroelectric crossover seen via characteristic temperatures of Ba_xSr_1–xTiO₃ ferroelectrics detected by acoustic emission

Dul’kin

Zhai

Roth

2015

Physica Status Solidi (b)

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BaxSr1–xTiO3 ferroelectrics ceramic with x = 70 and 80% have been studied by means of acoustic emission over a wide 0–300 °C temperature range and under dc external electric field. All the Curie temperatures Tc, intermediate temperatures T*, and Burns temperatures Td have been successfully detected and compared with those previously detected in BaxSr1–xTiO3 with x = 60% and pure BaTiO3, using the acoustic emission. For all the compounds, the critical end points at which the strains are expected to be largest, have been successfully detected, too. While the Tc linearly increases as x increases, it was established that both the T* and Td exhibit nonlinear behavior: they initially decrease, attain the minima near x ≈ 70% and then start to increase and tend to those, corresponding to pure BaTiO3, as it was previously reconstructed for Td in BaZrxTi1–xO3 compound [Shvartsman and Lupascu, J. Am. Ceram. Soc. 95, 1 (2012)]. Such a phenomenon is discussed from the viewpoint of the presence of polar nanoregions, intrinsic to pure BaTiO3 in the paraelectric phase, and it is concluded, that a minimum in both the T*(x) and Td(x) dependences points out a range of relaxor–ferroelectric crossovers in Ba‐based compounds.

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Section: Introductionmentioning

confidence: 98%

Relaxor–ferroelectric crossover seen via characteristic temperatures of Ba_xSr_1–xTiO₃ ferroelectrics detected by acoustic emission

Dul’kin

Zhai

Roth

2015

Physica Status Solidi (b)

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“…These doping-induced local elastic stresses have been recently observed by accoustic emission in PST-Ba and PST-La. 25 Furthermore, the T ? ðEÞ dependence for PST-Ba approaches a constant at higher electric field (E th $ 2 kV=cm) as compared to PST, i.e., the field-induced B-site cation displacements are saturated at higher E. This indicates that the intrinsic zero-field B-cation coupled polar shifts in PST-Ba are smaller than those in stoichiometric PST.…”

Section: Bltzmentioning

confidence: 99%

Influence of electric field on local phase transformations in relaxor ferroelectrics PbSc0.5Ta0.5O3 and Pb0.78Ba0.22Sc0.5Ta0.5O3

Maier

Steilmann

Gospodinov

et al. 2012

Journal of Applied Physics

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In situ temperature-dependent Raman-scattering experiments under an external dc electric field E have been performed on PbSc 0:5 Ta [110]. This indicates that the actual polar B-cation shifts are along the cubic body diagonals, implying a rhombohedral structure of the polar nanoregions. The T ? ðEÞ-dependence reveals that the local structural distortions associated with locally coupled polar displacements of B-site cations reach saturation near 0.5 kV/cm. When Pb 2þ is partially replaced by Ba 2þ , the strong increase of T ? with E occurs if the electric field is applied along the [110] direction. This indicates that the substitution disorder on the A-site lowers the symmetry of the polar nanoregions to orthorhombic or monoclinic. The T ? ðEÞ dependence determined from the B-cation localized mode shows saturation near 2.0 kV/cm, indicating that the zero-field structural state of PST-Ba exhibits less coupled polar shifts of B-site cations as compared to that of PST. According to the E-dependence of the Raman scattering near 55 cm À1 , for both compounds the overall response of the Pb system to the external electric field in the vicinity of T ? ðEÞ resembles antiferroelectric behavior, which along with the fact that the coupling between the B-site cations is ferroelectric, suggests that the polar nanoregions in Pb-based relaxors are ferrielectric in nature.

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“…3).Ṅ exhibits a pronounced maximum at 0.4 kV/cm, slightly above E th in reasonable agreement with previous observations. 27,28,61,62 At this point a 'giant' piezoelectric response has been postulated, 41,64,65 and thus this maximum may relate to a critical end point (CEP) in the E − T phase diagrams of RFEs. 41,64 In this scenario the T n (E) curve consists of two segments where fields E < 0.3 kV/cm are insufficient to break the internal random polarity of the tweed structures, while fields E > 0.3 kV/cm generate fully polarized tweed.…”

Section: Fig 2 Plots Of the Mafe-pe Phase Transition Temperaturementioning

confidence: 99%

“…2 shows AE count rates data as functions of T and E. All the temperatures are influenced by E. T n and T * tw exhibit the characteristic minimum at E th = 0.3 kV/cm similar to those previously observed in other RFEs. 27,28,[60][61][62] T pn d exhibits the non-linear behavior with an anomaly near the same electric field, E th = 0.3 kV/cm, but without any minimum: it monotonically increases and saturates for E > E th .…”

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confidence: 99%

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Ferroelectric precursor behavior of highly cation-ordered PbSc0.5Ta0.5O3 detected by acoustic emission: Tweed and polar nanoregions

Dul’kin¹,

Salje²,

Aktas³

et al. 2014

Applied Physics Letters

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Highly cation-ordered, ferroelectric PbSc 0.5 Ta 0.5 O 3 (PST) crystals have been studied by acoustic emission over a wide temperature range. The high degree of order leads to a non-dispersive dielectric anomaly at T trans = 300 K of a weakly first order phase transition. Acoustic emission (AE) was found at three characteristic temperatures, 330 K, 409 K and ∼600 K, but none between these temperatures. These temperatures are close to those known from cation-disordered relaxor PST, containing polar nano regions (PNRs). The microstructure in our ferroelectric PST contains structural tweed rather than PNRs. The coincidence of the AE temperatures points towards a close structural relationship between PNRs and tweed. Furthermore, when electric fields are applied, we observe shifts of these temperatures which are similar to 'critical end point' behavior. The similarity of AE signals in relaxors and tweed ferroelectrics proves that AE detects signals in a wider parameter space than previously expected.Random fields and local phase transitions are commonly evoked when symmetry changes in heterogeneous systems. While some models predict a well-defined transition behavior, such as the spherical random-bondrandom-field (SRBRF), 1,2 where the system transforms at a well-defined temperature from a paraelectric phase to a spherical glass phase without long range order. Other approaches predict smeared cross-overs such as Vugmeister and Rabitz, 3 and the traditional composition fluctuations model, 4 and the super-paraelectric model by Cross. 5 In none of these cases would a classic criticality analysis in terms of Wilson exponents of single thermodynamic order parameters be applicable. Experimentally, smeared crossovers are indeed seen in relaxor ferroelectrics (RFEs). These are materials with wide frequency dispersions of the dielectric response in the transition region. In addition, the transition between a paraelectric and a ferroelectric phase is not only smeared but also split into a number of other singularities which are commonly ascribed to the existence and temperature evolution of polar nanosized regions (PNRs), 6,7 The structural properties of PNRs are still not fully understood with few studies focused on atomic-level correlation effects between PNRs. 8Smooth crossover near the Burns temperature T d at high temperature range is seen in RFEs by the temperature evolution of the refractive index, 9-11 dielectrics and Brillouin light scattering, 12-19 polarized Raman spectra, 20,21 thermal expansion, 22-24 and acoustic emission (AE). 25-29 Similar behavior is found near the intermediate temperature T * . 12-21,30-35 On further cooling, a smeared frequency dependent temperature maximum of the dielectric response occurs near T m and, slightly below T m the freezing occurs at the freezing temperature T f , similar to polar-glass phases. [36][37][38][39] In contrast to these observations, one finds that AE studies [12][13][14][15][16][17][18][19]22,23,[25][26][27][28][29][30] show extremely sharp singularities at T d and T...

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Effect of A-site La and Ba doping on threshold field and characteristic temperatures of PbSc0.5Ta0.5O3 relaxor studied by acoustic emission

Cited by 20 publications

References 39 publications

Relaxor–ferroelectric crossover seen via characteristic temperatures of Ba_xSr_1–xTiO₃ ferroelectrics detected by acoustic emission

Relaxor–ferroelectric crossover seen via characteristic temperatures of Ba_xSr_1–xTiO₃ ferroelectrics detected by acoustic emission

Influence of electric field on local phase transformations in relaxor ferroelectrics PbSc0.5Ta0.5O3 and Pb0.78Ba0.22Sc0.5Ta0.5O3

Ferroelectric precursor behavior of highly cation-ordered PbSc0.5Ta0.5O3 detected by acoustic emission: Tweed and polar nanoregions

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Effect of A-site La and Ba doping on threshold field and characteristic temperatures of PbSc0.5Ta0.5O3 relaxor studied by acoustic emission

Cited by 20 publications

References 39 publications

Relaxor–ferroelectric crossover seen via characteristic temperatures of BaxSr1–xTiO3 ferroelectrics detected by acoustic emission

Relaxor–ferroelectric crossover seen via characteristic temperatures of BaxSr1–xTiO3 ferroelectrics detected by acoustic emission

Influence of electric field on local phase transformations in relaxor ferroelectrics PbSc0.5Ta0.5O3 and Pb0.78Ba0.22Sc0.5Ta0.5O3

Ferroelectric precursor behavior of highly cation-ordered PbSc0.5Ta0.5O3 detected by acoustic emission: Tweed and polar nanoregions

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Relaxor–ferroelectric crossover seen via characteristic temperatures of Ba_xSr_1–xTiO₃ ferroelectrics detected by acoustic emission

Relaxor–ferroelectric crossover seen via characteristic temperatures of Ba_xSr_1–xTiO₃ ferroelectrics detected by acoustic emission