Broad-band dielectric spectroscopy of tetragonal PLZT<b><i>x</i></b>/40/60

Buixaderas, E.; Veljko, S.; Savinov, M.; Vaněk, Přemysl; Kamba, S.; Petzelt, J.; Kosec, Marija

doi:10.1080/01411590600892179

Cited by 13 publications

(5 citation statements)

References 25 publications

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“…ΔTEC is close to the 3.45 K observed in PMN-10PT, but at a much higher electric field of 140 kV/cm [36]. We argue that such ECE enhancement for relatively modest electric fields is most likely due to the latent heat of the first order P-FE transition in 12/40/60 PLZT ceramics [45,47]. Much sharper rise of the ΔTEC near the FE transition than in 8/65/35 PLZT ceramics is signaling that the ΔTEC is enhanced by the latent heat up to L/cph  0.7 K. Here, the latent heat (L) of the FE transition in 12/40/60 PLZT ceramics, is estimated from calorimetric measurements to L250 J/kg [47].…”

Section: B Electrocaloric Investigationssupporting

confidence: 65%

“…We argue that such ECE enhancement for relatively modest electric fields is most likely due to the latent heat of the first order P-FE transition in 12/40/60 PLZT ceramics [45,47]. Much sharper rise of the ΔTEC near the FE transition than in 8/65/35 PLZT ceramics is signaling that the ΔTEC is enhanced by the latent heat up to L/cph  0.7 K. Here, the latent heat (L) of the FE transition in 12/40/60 PLZT ceramics, is estimated from calorimetric measurements to L250 J/kg [47]. Typical latent heat values of 60 J/kg to 400 J/kg, such as observed in Lead Magnesium Niobate (PMN) and Barium Titanate (BTO), respectively, can enhance the ECE for 0.2 to 1 K [15,29].…”

Section: B Electrocaloric Investigationsmentioning

confidence: 99%

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Electrocaloric response in lanthanum-modified lead zirconate titanate ceramics

Asbani

Marssi

Dellis

et al. 2020

Journal of Applied Physics

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Recent findings of a large electrocaloric (EC) effect in polymeric and inorganic ferroelectric materials open a potential possibility of development of solid-state cooling or heating devices of new generation with better energy efficiency that may be less harmful for the environment. We investigate by using direct measurements, the temperature and electric field dependence of the electrocaloric response in Pb1-xLax(ZryTi1-y)1-x/4O3 bulk ceramics (PLZT) with x=0.06 and 0.12. Here, the properties of the EC response were probed in a part of the PLZT composition phase diagram with low y=0.40 composition, in which the EC effect was not previously studied. Measurement results show the existence of the sizeable EC response in 12/40/60 PLZT sample with the EC temperature change (ΔTEC) of 2.92 K at 430 K and 80 kV/cm. This value exceeds previously obtained ΔTEC values in relaxor ferroelectric x/65/35 PLZT compositions and rivaling the best EC response in lead magnesium niobate-lead titanate ceramics. The electrocaloric responsivity (ΔT/ΔE) value of 0.41x10 -6 Km/V determined at a lower electric field of 20 kV/cm and 410 K is comparable to those observed in other perovskite ferroelectrics. *

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Section: B Electrocaloric Investigationssupporting

confidence: 65%

Section: B Electrocaloric Investigationsmentioning

confidence: 99%

Electrocaloric response in lanthanum-modified lead zirconate titanate ceramics

Asbani

Marssi

Dellis

et al. 2020

Journal of Applied Physics

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“…The temperature dependences of the IR spectra of PLZT x/40/60 were published in [13,14]. There we used a generalized four-parameter oscillator model to fit the spectra and obtained the effective dielectric function ε eff (ω).…”

Section: The Ema Modelmentioning

confidence: 99%

“…The lattice dynamics of ferroelectric PLZT 5/40/60 had already been studied by us using IR and dielectric spectroscopy [13]. It was shown that the dielectric behaviour of this sample, considered as a normal ferroelectric (with T C = 584 K), is governed by a soft mode in the THz range and a lower-frequency excitation related to polar microdomains appearing on lowering the temperature.…”

Section: Introductionmentioning

confidence: 99%

Raman spectroscopy and effective dielectric function in PLZTx/40/60

Buixaderas¹,

Gregora²,

Kamba³

et al. 2008

J. Phys.: Condens. Matter

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The Raman spectra of the ceramics PLZT x/40/60 have been measured in the temperature range 20–800 K. An assignment of the Raman modes is presented using the results of the effective medium approximation for the IR data. Factor-group analysis is presented for the case of off-site position of cations or unit cell doubling, which allows a higher number of active phonons in the IR and Raman spectra. The presence of Raman-active modes in the cubic phase is associated with local unit cell doubling and symmetry breakdown due to the off-site cations.

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“…[ 15 ] Similarly, a small phase transition enthalpy of 0.19 J g −1 was found in the Pb 0.85 La 0.15 Zr 0.4 Ti 0.6 O 3 ceramic with a Curie temperature of 26 °C. [ 16 ] Therefore, it is difficult to simultaneously obtain a large phase transition enthalpy as well as a T C near room temperature in simple ABO 3 perovskite materials.…”

Section: Introductionmentioning

confidence: 99%

Room‐Temperature Symmetric Giant Positive and Negative Electrocaloric Effect in PbMg_0.5W_0.5O₃ Antiferroelectric Ceramic

et al. 2021

Adv Funct Materials

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As an emerging solid‐state refrigeration technology with zero‐emission and high energy conversion efficiency, there is a compelling need for ferroelectric materials with giant electrocaloric effects (ECEs) at room temperature suitable for refrigeration applications. The complex perovskite antiferroelectric (AFE), PbMg0.5W0.5O3, containing non‐equivalent B‐site ions with a symmetric giant positive and negative ECE near room temperature is presented. At the Curie temperature of 36 °C, the first‐order AFE–paraelectric phase transition gives rise to a large enthalpy change of 3.92 J g−1, more than four times that of BaTiO3. This leads to a significant ECE under the influence of an electric field. The direct electrocaloric characterization shows that the adiabatic temperature change, ΔT, exhibits symmetric peaks with a giant positive maximum of 1.79 K (ΔS = 1.68 J kg−1 K−1) at 36 °C and a negative maximum of −2.02 K (ΔS = −1.93 J kg−1 K−1) at 34 °C. The ultrahigh magnitude of ΔT near room temperature makes PbMg0.5W0.5O3 a superior electrocaloric material far beyond traditional PbZrO3‐based AFEs. The coexistence of symmetric giant positive and negative ΔT to further improve cooling efficiency is expected. In addition, the good reversibility and negligible leakage current should pave the way for practical applications.

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Broad-band dielectric spectroscopy of tetragonal PLZTx/40/60

Cited by 13 publications

References 25 publications

Electrocaloric response in lanthanum-modified lead zirconate titanate ceramics

Electrocaloric response in lanthanum-modified lead zirconate titanate ceramics

Raman spectroscopy and effective dielectric function in PLZTx/40/60

Room‐Temperature Symmetric Giant Positive and Negative Electrocaloric Effect in PbMg_0.5W_0.5O₃ Antiferroelectric Ceramic

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Broad-band dielectric spectroscopy of tetragonal PLZTx/40/60

Cited by 13 publications

References 25 publications

Electrocaloric response in lanthanum-modified lead zirconate titanate ceramics

Electrocaloric response in lanthanum-modified lead zirconate titanate ceramics

Raman spectroscopy and effective dielectric function in PLZTx/40/60

Room‐Temperature Symmetric Giant Positive and Negative Electrocaloric Effect in PbMg0.5W0.5O3 Antiferroelectric Ceramic

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Product

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Room‐Temperature Symmetric Giant Positive and Negative Electrocaloric Effect in PbMg_0.5W_0.5O₃ Antiferroelectric Ceramic