Enhancement of the electrocaloric effect over a wide temperature range in PLZT ceramics by doping with Gd3+ and Sn4+ ions

Lü, Biao; Yao, Yingbang; Jian, Xiaodong; Tao, Tao; Liang, Bo; Zhang, Q. M.; Lu, Sheng Guo

doi:10.1016/j.jeurceramsoc.2018.11.042

Cited by 39 publications

(19 citation statements)

References 58 publications

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“…It can be seen that the shapes and locations of peaks agree with the peaks of 3 r -T curves measured at À150-200 C. The relaxor behavior around FE-PE phase transition can be analyzed according to the Curie-Weiss law. 9 The equation is expressed as…”

Section: Resultsmentioning

confidence: 99%

“…In recent years, a certain improvement of the ECE has been achieved in various kinds of ferroelectric materials, especially in lead-based ones such as Pb(Zr,Ti)O 3 (PZT) ferroelectrics and Pb(Mg 1/3 Nb 2/3 )O 3 (PMN) relaxor ferroelectrics. [8][9][10][11] Based on the demands of environmentally friendly development, the ECE of lead-free ferroelectrics has also been emphasized with typical examples of BaTiO 3 (BT) and (Na,Bi)TiO 3 (BNT)-based materials because of the strong ferroelectricity with diversied phase structures of BT and the existence of depolarization temperature (T d ) of BNT, respectively. [12][13][14][15][16][17][18][19][20] However, scarce attention has been paid to another lead-free ferroelectric, potassium sodium niobate [(K,Na)NbO 3 , KNN], even though it also has strong ferroelectricity and plentiful phase boundaries.…”

Section: Introductionmentioning

confidence: 99%

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Large electrocaloric effect under electric field behavior in potassium sodium niobate ceramics with incompletely overlapped phase boundaries

Yin

Zhao

et al. 2022

J. Mater. Chem. A

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Large electrocaloric effect under electric field behavior in potassium sodium niobate ceramics with incompletely overlapped phase boundaries

Yin

Zhao

et al. 2022

J. Mater. Chem. A

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“…The ECE is associated with the polarization, phenomenological coefficient, multiple polar states, as well as the breakdown electric field, etc. [56][57][58][59]. Indeed, these physical properties are strongly dependent on features and morphologies of dielectric materials such as grain size, size distribution, and aspect ratio.…”

Section: Table 2 Dielectric Properties Of Bczt Ceramics With Rod-likementioning

confidence: 99%

Enhanced dielectric and electrocaloric properties in lead-free rod-like BCZT ceramics

Hanani¹,

Merselmiz²,

Danine³

et al. 2020

J Adv Ceram

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Ba 0.85 Ca 0.15 Zr 0.10 Ti 0.90 O 3 (BCZT) lead-free ceramics demonstrated excellent dielectric, ferroelectric, and piezoelectric properties at the morphotropic phase boundary (MPB). So far, to study the effect of morphological changes on dielectric and ferroelectric properties in lead-free BCZT ceramics, researchers have mostly focused on the influence of spherical grain shape change. In this study, BCZT ceramics with rod-like grains and aspect ratio of about 10 were synthesized by surfactant-assisted solvothermal route. X-ray diffraction (XRD) and selected area electron diffraction (SAED) performed at room temperature confirm the crystallization of pure perovskite with tetragonal symmetry. Scanning electron microscopy (SEM) image showed that BCZT ceramics have kept the 1D rod-like grains with an average aspect ratio of about 4. Rod-like BCZT ceramics exhibit enhanced dielectric ferroelectric (ε r = 11,906, tanδ = 0.014, P r = 6.01 µC/cm², and E c = 2.46 kV/cm), and electrocaloric properties (ΔT = 0.492 K and  = 0.289 (Kmm)/kV at 17 kV/cm) with respect to spherical BCZT ceramics. Therefore, rod-like BCZT lead-free ceramics have good potential to be used in solid-state refrigeration technology. Keywords: lead-free Ba 0.85 Ca 0.15 Zr 0.10 Ti 0.90 O 3 (BCZT); rod-like Ba 0.85 Ca 0.15 Zr 0.10 Ti 0.90 O 3 (BCZT); dielectric; ferroelectric; electrocaloric effect

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“…This is because the indirect method only calculates the polarization along the direction of the electric field. The direct method, however, will measure the temperature change caused by the polarization in all directions …”

Section: Resultsmentioning

confidence: 99%

Direct and indirect measurement of large electrocaloric effect in barium strontium titanate ceramics

Dai

Wang

Huang

et al. 2019

Int J Applied Ceramic Tech

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Barium strontium titanate (Ba1‐xSrxTiO3‐BST) ceramics, where x = 0.05, 0.15, 0.25, and 0.35, was prepared via a solid‐state reaction method. The lattice structures and morphologies of the ceramic samples were analyzed using X‐ray diffraction and scanning electron microscopy technologies. The dielectric and ferroelectric properties of the BST ceramics were characterized using a precision impedance analyzer and a ferroelectric polarization‐electric field (P‐E) hysteresis loop tester, respectively. The electrocaloric effect was indirectly calculated using the Maxwell relations and P‐E loops as a function of temperature and electrical field, and also directly measured using a computer‐controlled thermocouple and high‐voltage power supply. An adiabatic temperature change of 1.82 K was procured, indicating a promising potential in the applications as cooling devices.

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Enhancement of the electrocaloric effect over a wide temperature range in PLZT ceramics by doping with Gd3+ and Sn4+ ions

Cited by 39 publications

References 58 publications

Large electrocaloric effect under electric field behavior in potassium sodium niobate ceramics with incompletely overlapped phase boundaries

Large electrocaloric effect under electric field behavior in potassium sodium niobate ceramics with incompletely overlapped phase boundaries

Enhanced dielectric and electrocaloric properties in lead-free rod-like BCZT ceramics

Direct and indirect measurement of large electrocaloric effect in barium strontium titanate ceramics

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