Elastic Properties and Enhanced Piezoelectric Response at Morphotropic Phase Boundaries

Cordero, F.

doi:10.3390/ma8125452

Cited by 61 publications

(39 citation statements)

References 194 publications

(335 reference statements)

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“…A similar feature has been observed more clearly in PZT. 10,17 Instead, the rise of s ′ below T OT cannot be attributed to DW relaxation, because passing from 0.9 to 12 kHz the amplitude of the losses, and hence of DW relaxation, is halved, while s ′ is almost unchanged.…”

Section: Methodsmentioning

confidence: 99%

Rotational instability of the electric polarization and divergence of the shear elastic compliance

et al. 2016

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The rotational instability of the electric polarization P during phase transformations between ferroelectric phases is of great practical interest, since it may be accompanied by extremely large values of the piezoelectric coefficient, and a divergence of the coupled shear compliance contributes to such enhancements. In the literature, this had been explicitly calculated in the framework of the Landau theory and discussed with specific numerical simulations involving tetragonal, orthorhombic and rhombohedral ferroelectric phases. When monoclinic phases are involved, such an approach is practically impossible, and an approximated treatment had been proposed, based on the observation that in those cases there are shear strains almost linearly coupled to the transverse component of P, implying a divergence of the Curie-Weiss type in the associated compliances. Here the argument is extended to the general case of transitions whose major effect is a rotation of the polarization, and the limits of its validity are discussed. As experimental verification, the elastic response of BaTiO3 is measured and analyzed, together with those of other ferroelectric perovskites available in the literature, like KNN.

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Section: Methodsmentioning

confidence: 99%

Rotational instability of the electric polarization and divergence of the shear elastic compliance

et al. 2016

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“…Also, chemical disorder originating from multiple occupancy of one lattice site can result in the appearance of relaxor states, which also have associated characteristic dielectric maxima [12]. In these cases, measurements of the temperature dependence of the low-frequency Young's modulus by dynamical mechanical analysis (DMA) have been shown to nicely complement electrical measurements and to enable identifying the phase transitions for a number of complicated examples [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Origin of discrepancy between electrical and mechanical anomalies in lead-free (K,Na)NbO3 -based ceramics

et al. 2016

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Ferroelectric polymorphic phase coexistence, associated with either the presence of a morphotropic phase boundary or a temperature-driven polymorphic phase transition, is currently acknowledged as the key to high piezoelectric activity and is searched when new perovskite materials are developed, like lead-free alternatives to state-of-the-art Pb(Zr,Ti)O 3 . This requires characterization tools that allow phase coexistence and transitions to be readily identified, among which measurements of the temperature dependences of Young's modulus and mechanical losses by dynamical mechanical analysis stand out as a powerful technique to complement standard electrical characterizations. We report here the application of this technique to (K 1−x Na x )NbO 3 -based materials, which are under extensive investigation as environmentally friendly high sensitivity piezoelectrics. The elastic anomalies associated with the different phase transitions are identified and are shown to be distinctively shifted in relation to the dielectric ones. The origin of this discrepancy is discussed with the help of temperature-dependent Raman spectroscopy and is proposed to be a characteristic of diffuse phase transitions.

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“…The acoustic properties are related to elastic waves propagating in the sample and can be used to determine elastic constants, which are a fundamental physical property. Cordero has shown the important relationship between elastic properties and enhanced piezoelectric performance of several ferroelectric materials at the MPB [28]. …”

Section: Introductionmentioning

confidence: 99%

Acoustic Anomalies and Phase Transition Behaviors of Lead-Free Piezoelectric (Na1/2Bi1/2)TiO3-xBaTiO3 Single Crystals as Revealed by Brillouin Light Scattering

Lee

et al. 2018

Materials

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The elastic properties of unpoled and prepoled (Na1/2Bi1/2)TiO3-xBaTiO3 (NBT-xBT) single crystals near the morphotropic phase boundary were investigated as a function of temperature using Brillouin light scattering. The acoustic mode frequency and the related acoustic damping of unpoled NBT-xBT showed very broad minimum and maximum, respectively, consistent with typical relaxor behaviors. The frequency softening of the longitudinal acoustic mode together with the increase in acoustic damping was largest along the <100> direction, indicating that polarization fluctuations were most substantial along this crystallographic direction. The difference in acoustic behaviors between the unpoled NBT-xBTs with x = 0.05 and 0.08 were negligible, which means that the NBT-xBT system exhibits typical relaxor properties over a certain composition range of at least 5~8%. The obtained relaxation time of polar nanoregions in the paraelectric phase showed a gradual slowing-down character without any critical divergent behavior. The prepoling of NBT-xBT along the <100> direction induced drastic changes in both mode frequency and damping at ~110 °C when the poling field was larger than 1.4 kV/mm, corresponding to the depoling process from macroscopic/mesoscopic ferroelectric order to ergodic relaxor state upon heating. Phase coexistence of ferroelectric and relaxor states was observed at the intermediate poling field of 1.4 kV/mm.

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Elastic Properties and Enhanced Piezoelectric Response at Morphotropic Phase Boundaries

Cited by 61 publications

References 194 publications

Rotational instability of the electric polarization and divergence of the shear elastic compliance

Rotational instability of the electric polarization and divergence of the shear elastic compliance

Origin of discrepancy between electrical and mechanical anomalies in lead-free (K,Na)NbO3 -based ceramics

Acoustic Anomalies and Phase Transition Behaviors of Lead-Free Piezoelectric (Na1/2Bi1/2)TiO3-xBaTiO3 Single Crystals as Revealed by Brillouin Light Scattering

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