High-Resolution Calorimetric Study of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Pb</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:msub><mml:mi>Mg</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>/</mml:mo><mml:mn>3</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mi>Nb</mml:mi><mml:mrow><mml:mn>2</mml:mn><mml:mo>/</mml:mo><mml:mn>3</mml:mn></mml:mrow></mml:msub><mml:mo stretchy="false">)</mml:mo><mml:msub><mml:mi mathvariant="bold">O</mml:mi><mml:mn>3</mml:mn></mml:msub></mml

Novak, Nikola; Pirc, R.; Wencka, Magdalena; Kutnjak, Zdravko

doi:10.1103/physrevlett.109.037601

Cited by 77 publications

(53 citation statements)

References 35 publications

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“…408,409 Criticality is apparent in the C phase above under electric fields of (0.40 ± 0.12) kV/mm and was also observed for other relaxors and BT. 107,188,191 The 33 at the line of critical points is maximized and comparable to the values observed at the O to T PPB due to high reversible switching and intrinsic contributions.…”

Section: Strain Mechanisms Of the (1-x)ba(zr 02 Ti 08 )O 3 -X(ba 0supporting

confidence: 49%

“…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%

“…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%

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Strain Mechanisms in Lead-Free Ferroelectrics for Actuators

Acosta

2016

Springer Theses

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Section: Strain Mechanisms Of the (1-x)ba(zr 02 Ti 08 )O 3 -X(ba 0supporting

confidence: 49%

Section: 26mentioning

confidence: 99%

Section: Equation 217mentioning

confidence: 99%

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Strain Mechanisms in Lead-Free Ferroelectrics for Actuators

Acosta

2016

Springer Theses

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“…36 The critical point in polycrystalline PMN-xPT system is also likely to be diffuse in nature due to the observed orientational heterogeneity or even absence of critical point depending on the electric field direction. 35,[37][38][39][40] The temperature of the maximum ECE responsivity was observed to lie just above T d (¼ T C ) (extrapolated from Figure 4) which is reflected in their similar concentration dependence ( Figure 5). When the ferroelectric nature of PMN-PT is strengthened with increasing x, it is expected that T C is approaching T m (T C ¼ T m for ordinary ferroelectrics), 30,41 as shown in Figure 5.…”

Section: Resultsmentioning

confidence: 68%

Electrocaloric properties in relaxor ferroelectric (1−x)Pb(Mg1/3Nb2/3)O3–xPbTiO3 system

Peräntie

Tailor

Hagberg

et al. 2013

Journal of Applied Physics

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The electrocaloric effect (ECE) in the Pb(Mg1/3Nb2/3)O3–PbTiO3 (PMN-PT) solid solution system was investigated by means of detailed direct temperature measurements as a function of temperature, composition, and electric field. The (1−x)PMN-xPT ceramics of compositions 0 ≤ x ≤ 0.3 were fabricated by the columbite route. In opposite to conventional ferroelectrics, the maximum of electrocaloric effect was found to shift from the proximity of depolarization/Curie temperature to higher temperatures above a certain composition-dependent electric field strengths. Especially, the compositions with low PT content showed a broadened temperature range of electrocaloric effect. With increasing PbTiO3 concentration, the magnitude of ΔT increased, and the temperature dependence of the maximum ECE response gradually developed towards a more pronounced anomaly typical for conventional ferroelectrics. The arising high temperature electrocaloric effect in the ergodic relaxor phase was attributed to the contribution from polar nanoregions. All the compositions studied showed the highest electrocaloric activity just above the depolarization/Curie temperature close to the possible critical point, as recently predicted and observed for some compositions. The magnitude of the maximum electrocaloric temperature change was in the range of ΔT = 0.77–1.55 °C under an electric field strength of 50 kV/cm.

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“…When relaxors are cooled below the Burns temperature, small and randomly oriented polarized regions (PNRs) appear within the otherwise nonpolar crystal structure. Upon further cooling, PNRs grow in size and number [11], but their percolation is prevented by structural disorder and random electric fields [8,10,12]. This behavior would imply the coexistence of PNRs and a nonpolar matrix, in contrast to the single-phase structure proposed by the RF model.…”

mentioning

confidence: 89%

Nanoscale phase quantification in lead-free(Bi1/2Na1/2)TiO3−BaTiO
Groszewicz
¹
,
Breitzke
²
,
Dittmer
³

et al. 2014
Phys. Rev. B
58
1
34
0
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We address the unsolved question on the structure of relaxor ferroelectrics at the atomic level by characterizing lead-free piezoceramic solid solutions (100 − x)(Bi 1/2 Na 1/2 )TiO 3 -xBaTiO 3 (BNT-xBT) (for x = 1, 4, 6, and 15). Based on the relative intensity between spectral components in quadrupolar perturbed 23 Na nuclear magnetic resonance, we present direct evidence of the coexistence of cubic and polar local symmetries in these relaxor ferroelectrics. In addition, we demonstrate how the cubic phase vanishes whenever a ferroelectric state is induced, either by field cooling or changing the dopant amount, supporting the relation between this cubic phase and the relaxor state. Relaxor ferroelectrics have been intensively studied in the past 30 years because of their intriguing structural and dielectric features [1][2][3]. Despite that, the nature of their ground state remains an open question [4][5][6][7][8][9][10][11][12]. Several models have been proposed to describe this puzzling class of materials [1,[5][6][7][8]13], two of which are mainly concerned with the structure of the ground state of relaxors [4].The random field (RF) model proposes a single-phase structure broken up into ferroelectric nanodomains. These nanodomains are kept small under the constraint of quenched random electric fields which originate from chemical disorder [7,14]. The other model introduced the concept of "polar nanoregions" (PNRs) [13]. When relaxors are cooled below the Burns temperature, small and randomly oriented polarized regions (PNRs) appear within the otherwise nonpolar crystal structure. Upon further cooling, PNRs grow in size and number [11], but their percolation is prevented by structural disorder and random electric fields [8,10,12]. This behavior would imply the coexistence of PNRs and a nonpolar matrix, in contrast to the single-phase structure proposed by the RF model.An induced ferroelectric state can be established in relaxors when a strong electric field is applied. This state features macroscopic polarization and breaking of the cubic average symmetry [5,11,[15][16][17]. While the RF model suggests that this transformation and the formation of macroscopic ferroelectric domains are caused only by reorientation of previously nanometric ferroelectric domains, an additional mechanism is required when PNRs are considered. In that case, a long-range ferroelectric state can only be established if the nonpolar matrix becomes polarized, being incorporated by the growing PNRs.Two questions are raised by contrasting these two models: (1) Does the microscopic structure of relaxor ferroelectrics consist only of ferroelectric nanodomains or do regions of lower local symmetry (PNRs) coexist with a nonpolar matrix of * gerd.buntkowsky@chemie.tu-darmstadt.de † roedel@ceramics.tu-darmstadt.de undistorted structure? (2) How does the microscopic structure of relaxors evolve upon electric poling?In spite of their relevance, such questions have remained unsolved largely because the structural characterization of relaxors is a c...

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High-Resolution Calorimetric Study ofPb(Mg1/3Nb2/3)O3

Cited by 77 publications

References 35 publications

Strain Mechanisms in Lead-Free Ferroelectrics for Actuators

Strain Mechanisms in Lead-Free Ferroelectrics for Actuators

Electrocaloric properties in relaxor ferroelectric (1−x)Pb(Mg1/3Nb2/3)O3–xPbTiO3 system

Nanoscale phase quantification in lead-free(Bi1/2Na1/2)TiO3−BaTiO
Groszewicz
¹
,
Breitzke
²
,
Dittmer
³

et al. 2014
Phys. Rev. B
58
1
34
0
View full text Add to dashboard Cite

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High-Resolution Calorimetric Study ofPb(Mg1/3Nb2/3)O3

Cited by 77 publications

References 35 publications

Strain Mechanisms in Lead-Free Ferroelectrics for Actuators

Strain Mechanisms in Lead-Free Ferroelectrics for Actuators

Electrocaloric properties in relaxor ferroelectric (1−x)Pb(Mg1/3Nb2/3)O3–xPbTiO3 system

Nanoscale phase quantification in lead-free(Bi1/2Na1/2)TiO3−BaTiOGroszewicz1, Breitzke2, Dittmer3 et al. 2014Phys. Rev. B581340View full textAdd to dashboardCite

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Nanoscale phase quantification in lead-free(Bi1/2Na1/2)TiO3−BaTiO
Groszewicz
¹
,
Breitzke
²
,
Dittmer
³

et al. 2014
Phys. Rev. B
58
1
34
0
View full text Add to dashboard Cite