Electric-field–temperature phase diagram of the relaxor ferroelectric lanthanum-modified lead zirconate titanate

Bobnar, V.; Kutnjak, Zdravko; Pirc, R.; Levstik, A.

doi:10.1103/physrevb.60.6420

Cited by 183 publications

(137 citation statements)

References 32 publications

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“…In PLZT, the same line has been observed on ZFHaFC and it was shown that the depolarization takes place at this line. 22,40 This implies that the ferroelectric phase becomes unstable above this line. Below this line, the ferroelectric phase is metastable but it can nucleate above the threshold field.…”

Section: Discussionmentioning

confidence: 99%

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Bias-field effect on the temperature anomalies of dielectric permittivity inPbMg1∕3Nb2∕3

et al. 2005

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In contrast to ordinary ferroelectrics where the temperature T m of the permittivity maximum monotonically increases with bias field E in ͑1−x͒PbMg 1/3 Nb 2/3 O 3 -͑x͒PbTiO 3 ͑0 ഛ x ഛ 0.35͒ single crystals, T m was found to remain constant or to decrease with E up to a certain threshold field E t , above which T m starts increasing. The threshold field E t decreases with increasing x, tending toward zero at approximately x = 0.4. We explain this dependence in the framework of models which take into account quenched random fields and random bonds. For crystals with 0.06ഛ x ഛ 0.13, the E-T phase diagrams are constructed. In contrast to PMN, they exhibit an additional, nearly field-independent boundary, in the vicinity of the Vogel-Fulcher temperature. We believe this boundary to correspond to an additional phase transition and the appearing order parameter is likely to be nonpolar.

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Section: Discussionmentioning

confidence: 99%

“…This result is in agreement with measurements on ceramic PLZT. 22 In Fig. 7͑a͒, we show a common E-T phase diagram for a system experiencing a first-order phase transition.…”

Section: Resultsmentioning

confidence: 99%

Bias-field effect on the temperature anomalies of dielectric permittivity inPbMg1∕3Nb2∕3

et al. 2005

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“…106 It should be noted that due to the history-dependent properties in the non-ergodic state of canonical relaxors 100 , isothermal (red) and isofield (blue) representations differ. 106,107 An electric field induced phase transition that originates from an ergodic state will be reversible, whereas from a non-ergodic state (below ) will be irreversible. Increasing temperature without an external electric field destabilizes the induced ferroelectric state.…”

Section: Equation 217mentioning

confidence: 99%

“…The decay of the induced ferroelectric state to the relaxor state occurs at − ~ 50 °C (Figure 5.41) and is attributed mostly to core regions and regions of the shells adjacent to them. It is noted that this transition is dependent on poling conditions 106,107 and thus a direct comparison between different studies should be made carefully. The freezing of PNRs into a non-ergodic state occurred at ~ 20 °C and is mostly attributed to shells.…”

Section: 26mentioning

confidence: 99%

Strain Mechanisms in Lead-Free Ferroelectrics for Actuators

Acosta

2016

Springer Theses

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“…In addition, the temperature-dependent strain properties are commonly expected to be poor because the electric field for a relaxor-to-ferroelectric transition increases significantly with temperature. 6,7 This finding means that the driving electric field must be accordingly increased with increasing temperature to preserve the expected strain values. However, such an effect is practically impossible to achieve due to the simultaneous decrease in the breakdown electric field.…”

Section: Introductionmentioning

confidence: 99%

Forced electrostriction by constraining polarization switching enhances the electromechanical strain properties of incipient piezoceramics

et al. 2017

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Recently developed lead-free incipient piezoceramics are promising candidates for off-resonance actuator applications due to their exceptionally large electromechanical strains. Their commercialization currently faces three critical challenges: the high driving electric field required for delivering the potentially large strains; large strain hysteresis, which is inappropriate for precision devices; and relatively high temperature dependencies. We propose that instead of utilizing incipient piezoelectric strains, harnessing the maximum possible electrostriction would provide a highly effective way to resolve all these challenges. This concept was experimentally demonstrated using textured 0.97Bi 1/2 (Na 0.78 K 0.22 ) 1/2 TiO 3 -0.03BiAlO 3 as an exemplary incipient piezoceramic, whereby texturing was achieved using a reactive templated grain-growth technique. The manufactured textured ceramic is characterized by S max /E max of 995 pm V − 1 and an electrostrictive coefficient, Q 33 , of 0.049 m 4 C − 2 . Both these parameters are as large as those of single crystals. The current work presents a significant advancement in the field of lead-free ceramics and can guide future efforts in this direction. In addition, the concept presented here can be easily transferred to other disciplines involving the design of functional properties of various materials. NPG Asia Materials (2017) 9, e346; doi:10.1038/am.2016.210; published online 27 January 2017 INTRODUCTIONSince the first report on incipient piezoelectric strain (IPS) in a (Bi 1/2 Na 1/2 )TiO 3 (BNT)-based lead-free ceramic, 1 there have been numerous attempts to enhance the strain properties of these materials. These studies have concluded that IPS is a common feature of relaxor ferroelectrics as long as their freezing temperature is below room temperature, that is, they are in the ergodic relaxor state, whereas ferroelectric long-range order is only stable under the application of a certain or higher electric field. 2-4 It should be noted that the electric-field-induced strain in a normal ferroelectric material is approximately half the strain inherently available for the given system. This result is due to the presence of the remanent state, which typically occupies~0.1% of the entire phase. 2 Piezoelectric strain commonly refers to the difference between the maximum and remanent strain levels, and it may be greatly enhanced by minimizing the remanent strain, as is the case for IPS.Thus far, most useful IPSs have been found in relaxor ferroelectrics, 3,5 indicating that the inherently large poling field, E pol , (poling field: an electric field required for inducing ferroelectric state out of the existing relaxor state, determined at the inflection point of the electric-field-dependent strain curve as illustrated

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Electric-field–temperature phase diagram of the relaxor ferroelectric lanthanum-modified lead zirconate titanate

Cited by 183 publications

References 32 publications

Bias-field effect on the temperature anomalies of dielectric permittivity inPbMg1∕3Nb2∕3

Bias-field effect on the temperature anomalies of dielectric permittivity inPbMg1∕3Nb2∕3

Strain Mechanisms in Lead-Free Ferroelectrics for Actuators

Forced electrostriction by constraining polarization switching enhances the electromechanical strain properties of incipient piezoceramics

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