Temperature dependence of the domain wall width in LaAlO3

Chrosch, J.; Salje, Ekhard K. H.

doi:10.1063/1.369152

Cited by 126 publications

(99 citation statements)

References 40 publications

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“…However, the domain wall thickness cannot be exactly measured by polarizing light microscope because of the misalignment between light beam and domain walls. In classic theory, the relationship between domain wall thickness and temperature was predicted as 20,21 W t / ðT À T c Þ À1 ; where W t is defined as domain wall thickness. The domain wall thickness becomes larger when the temperature is far above Curie temperature (T c ).…”

Section: Resultsmentioning

confidence: 99%

Domain size engineering in 0.5%MnO2-(K0.5Na0.5)NbO3 lead free piezoelectric crystals

Lin

Zhang

Cai

et al. 2015

Journal of Applied Physics

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The piezoelectric property of [001]-oriented 0.5%MnO2-(K0.5Na0.5)NbO3 (Mn-KNN) crystals was studied as a function of domain size, being poled with different electric fields at 205 C (above orthorhombic to tetragonal phase transition temperature To-t). The piezoelectric coefficients d33 and relative dielectric constants er were found to increase from 270 pC/N to 350 pC/N and 730 to 850 with the domain size decreasing from 9 to 2 lm, respectively. The thermal stability of piezoelectric property was investigated, where the d33 value for [001]-oriented Mn-KNN crystals with domain size of 2 lm was found to decrease to 330 pC/N at depoling temperature of 150 C, with minimal variation of 6%. The results reveal that domain size engineering is an effective way to improve the piezoelectric properties of Mn-KNN crystals. Publication DetailsLin, D., Zhang, S., Cai, C. & Liu, W. (2015). Domain size engineering in 0.5%MnO2-(K0.5Na0.5)NbO3 lead free piezoelectric crystals. Journal Of Applied Physics, 117 (7) The piezoelectric property of [001]-oriented 0.5%MnO 2 -(K 0.5 Na 0.5 )NbO 3 (Mn-KNN) crystals was studied as a function of domain size, being poled with different electric fields at 205 C (above orthorhombic to tetragonal phase transition temperature T o-t ). The piezoelectric coefficients d 33 and relative dielectric constants e r were found to increase from 270 pC/N to 350 pC/N and 730 to 850 with the domain size decreasing from 9 to 2 lm, respectively. The thermal stability of piezoelectric property was investigated, where the d 33 value for [001]-oriented Mn-KNN crystals with domain size of 2 lm was found to decrease to 330 pC/N at depoling temperature of 150 C, with minimal variation of $6%. The results reveal that domain size engineering is an effective way to improve the piezoelectric properties of Mn-KNN crystals. V C 2015 AIP Publishing LLC.

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Section: Resultsmentioning

confidence: 99%

Domain size engineering in 0.5%MnO2-(K0.5Na0.5)NbO3 lead free piezoelectric crystals

Lin

Zhang

Cai

et al. 2015

Journal of Applied Physics

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“…If the twin walls in EuTiO 3 are subject to pinning by oxygen vacancies, as in LaAlO 3 , it is likely that their freezing interval will also be in the vicinity of ∼450 K, i.e., well above T c . In this case the observed variations in Q −1 most likely reflect changes in the number density, N, and thickness, w, of ferroelastic twin walls, which are expected to increase according to w Ý N Ý (T c − T ) −1 as T → T c [50][51][52][53]. Interaction of the twin walls with the underlying lattice and point defects is known to be stronger for thin walls than thick walls [54,55].…”

Section: Discussionmentioning

confidence: 99%

Elastic and anelastic relaxations associated with phase transitions inEuTiO3

et al. 2014

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Elastic and anelastic properties of single crystal samples of EuTiO 3 have been measured between 10 and 300 K by resonant ultrasound spectroscopy at frequencies in the vicinity of 1 MHz. Softening of the shear elastic constants C 44 and 1 2 (C 11 − C 12 ) by ∼20-30% occurs with falling temperature in a narrow interval through the transition point, T c = 284 K, for the cubic-tetragonal transition. This is accounted for by classical coupling of macroscopic spontaneous strains with the tilt order parameter in the same manner as occurs in SrTiO 3 . A peak in the acoustic loss occurs a few degrees below T c and is interpreted in terms of initially mobile ferroelastic twin walls, which rapidly become pinned with further lowering of temperature. This contrasts with the properties of twin walls in SrTiO 3 , which remain mobile down to at least 15 K. No further anomalies were observed that might be indicative of strain coupling to any additional phase transitions above 10 K. A slight anomaly in the shear elastic constants, independent of frequency and without any associated acoustic loss, was found at ∼140 K. It marks a change from elastic stiffening to softening with falling temperature and perhaps provides evidence for coupling between strain and local fluctuations of dipoles related to the incipient ferroelectric transition. An increase in acoustic loss below ∼80 K is attributed to the development of dynamical magnetic clustering ahead of the known antiferromagnetic ordering transition at ∼5.5 K. Detection of these elastic anomalies serves to emphasize that coupling of strain with tilting, ferroelectric, and magnetic order parameters is likely to be a permeating influence in determining the structure, stability, properties, and behavior of EuTiO 3 .

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“…The elastic properties of LaAlO 3 measured at RUS frequencies are dominated by intrinsic effects from strain/order parameter coupling and the anelastic losses have been understood in terms of local and rather limited displacements of the twin walls [43]. Twin walls in purely ferroelastic materials tend to have thicknesses corresponding to just a few unit cells [51], whereas magnetic domain walls are typically much thicker than this. If there is any coupling between a magnetic order parameter and strain, it is inevitable that the twin walls which separate domains that are both magnetic and ferroelastic will involve some combination of these limiting cases.…”

Section: Ferroelastic Properties Of Ndcomentioning

confidence: 99%

Multiferroic (ferroelastic/ferromagnetic/ferrimagnetic) aspects of phase transitions in RCo₂Laves phases

Driver

Herrero‐Albillos

Bonilla

et al. 2014

J. Phys.: Condens. Matter

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Magnetic phase transitions in RCo 2 Laves phases with R as a rare earth element are accompanied by changes in crystallographic space group. For purely structural transitions they would be described as improper ferroelastic and therefore fulfil the condition for multiferroic phase transitions in combining two out of three properties, ferro/antiferromagnetism, ferroelectricity and ferroelasticity. Here lattice parameter data from the literature and new measurements of elastic and anelastic properties, by resonant ultrasound spectroscopy, for NdCo 2 and ErCo 2 have been analysed from this perspective. The temperature dependence of symmetry-breaking shear strains is consistent with the cubic ↔ tetragonal transition in NdCo 2 being close to tricritical in character and the cubic ↔ rhombohedral transition in ErCo 2 being first order. Elastic softening and acoustic loss within the stability ranges of the ferroelastic phases can be understood in terms of a combination of intrinsic softening due to strain/order parameter coupling and ferroelastic twin-wall motion. Softening ahead of the transitions does not fit with standard macroscopic descriptions of dynamic effects from other systems but, rather, in the case of NdCo 2 , might be attributed to the involvement of a second zone centre order parameter related to a separate instability driven by cooperative Jahn-Teller distortions. In ErCo 2 , acoustic loss in the temperature interval above the transition point is discussed in terms of a possible tweed microstructure associated with strain coupling to local magnetic ordering. The overall multiferroic behaviour can be understood in terms of a single magnetic order parameter (irrep m + 4 of magnetic space group Fd3m1 ) which couples with a structural order parameter (irrep + 3 or + 5 ). The coupling is linear/quadratic which, in the case of two separate instabilities, causes them to combine in a single multiferroic phase transition.

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Temperature dependence of the domain wall width in LaAlO3

Cited by 126 publications

References 40 publications

Domain size engineering in 0.5%MnO2-(K0.5Na0.5)NbO3 lead free piezoelectric crystals

Domain size engineering in 0.5%MnO2-(K0.5Na0.5)NbO3 lead free piezoelectric crystals

Elastic and anelastic relaxations associated with phase transitions inEuTiO3

Multiferroic (ferroelastic/ferromagnetic/ferrimagnetic) aspects of phase transitions in RCo₂Laves phases

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Temperature dependence of the domain wall width in LaAlO3

Cited by 126 publications

References 40 publications

Domain size engineering in 0.5%MnO2-(K0.5Na0.5)NbO3 lead free piezoelectric crystals

Domain size engineering in 0.5%MnO2-(K0.5Na0.5)NbO3 lead free piezoelectric crystals

Elastic and anelastic relaxations associated with phase transitions inEuTiO3

Multiferroic (ferroelastic/ferromagnetic/ferrimagnetic) aspects of phase transitions in RCo2Laves phases

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Multiferroic (ferroelastic/ferromagnetic/ferrimagnetic) aspects of phase transitions in RCo₂Laves phases