Effects of lanthanum dopants on the Curie–Weiss and the local order behaviors for Pb1−xLax(Fe2/3W1/3)0.7Ti0.3O3 relaxor ferroelectrics

Hong, Cheng‐Shong; Chu, Sheng−Yuan; Tsai, Cheng‐Che; Hsu, Chi-Cheng; Su, Hsiu-Hsien

doi:10.1016/j.materresbull.2012.09.053

Cited by 8 publications

(2 citation statements)

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“…where T B is the temperature at which the Curie-Weiss temperature deviation begins, while T m is the maximum dielectric constant the temperature value. [10][11][12][13][14]28 Table I shows the T m , T B , and T m values with different amounts of SrTiO 3 dopant. As can be seen, the value of T m increases as the SrTiO 3 content increases, which implies that the ceramics with x = 0.02 exhibit the most obvious DPT behavior.…”

Section: Resultsmentioning

confidence: 99%

“…[4][5][6][7][8][9] In recent years, several models and approaches have been proposed to explain the physical properties and different mechanisms of relaxor ferroelectrics, including the spin glass model, Landau theory, and polar nanoregions (PNRs) approach. [10][11][12][13][14][15][16] In addition, the diffused phase transition (DPT) and the dielectric properties have a strong frequency dispersion, which is a typical dielectric behavior of relaxor ferroelectrics. The empirical law and the ordered model are usually used for describing the DPT behavior and ordered degree, as well as their interrelationship.…”

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Relaxor Behavior of Lead-Free Nonstoichiometric (Na_0.48-xK_0.48-xLi_0.04)Nb_0.89-xTa_0.05Sb_0.06O₃-xSrTiO₃Ceramics

Hong

Tsai

et al. 2017

ECS J. Solid State Sci. Technol.

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In the present work, the effects of SrTiO3 are investigated for nonstoichiometric (Na0.48-xK0.48-xLi0.04Srx)Nb0.89-xTixTa0.05Sb0.06O3 lead-free relaxor ferroelectric ceramics synthesized using a solid-state reaction method. The empirical law, two ordering models, the spin-glass model and the Curie–Weiss law are used to appraise the dielectric behavior. According to the fitting results and experimental data, the dielectric properties exhibit strong temperature-dependent characteristics with increasing amounts of SrTiO3 dopant, which is attributed to the disorder of the cations being significantly enhanced.

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Section: Resultsmentioning

confidence: 99%

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confidence: 99%

Relaxor Behavior of Lead-Free Nonstoichiometric (Na_0.48-xK_0.48-xLi_0.04)Nb_0.89-xTa_0.05Sb_0.06O₃-xSrTiO₃Ceramics

Hong

Tsai

et al. 2017

ECS J. Solid State Sci. Technol.

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Optimizing energy harvesting performance by tailoring ferroelectric/relaxor behavior in KNN-based piezoceramics

et al. 2022

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Piezoelectric energy harvesters (PEHs) fabricated using piezoceramics could convert directly the mechanical vibration energy in the environment into electrical energy. The high piezoelectric charge coefficient (d33) and large piezoelectric voltage coefficient (g33) are key factors for the high-performance PEHs. However, high d33 and large g33 are difficult to simultaneously achieve with respect to g33 = d33/(ε0εr) and d33 = 2Qε0εrPr. Herein, the energy harvesting performance is optimized by tailoring the CaZrO3 content in (0.964−x)(K0.52Na0.48)(Nb0.96Sb0.04)O3 −0.036(Bi0.5Na0.5)ZrO3−xCaZrO3 ceramics. First, the doping CaZrO3 could enhance the dielectric relaxation due to the compositional fluctuation and structural disordering, and thus reduce the domain size to ∼30 nm for x = 0.006 sample. The nanodomains switch easily to external electric field, resulting in large polarization. Second, the rhombohedral–orthorhombic–tetragonal phases coexist in x = 0.006 sample, which reduces the polarization anisotropy and thus improves the piezoelectric properties. The multiphase coexistence structures and miniaturized domains contribute to the excellent piezoelectric properties of d33 (354 pC/N). Furthermore, the dielectric relative permittivity (εr) reduces monotonously as the CaZrO3 content increases due to the relatively low ion polarizability of Ca2+ and Zr4+. As a result, the optimized energy conversion coefficient (d33 × g33, 5508 × 10−15 m2/N) is achieved for x = 0.006 sample. Most importantly, the assembled PEH with the optimal specimen shows the excellent output power (∼48 µW) and lights up 45 red commercial light-emitting diodes (LEDs). This work demonstrates that tailoring ferroelectric/relaxor behavior in (K,Na)NbO3-based piezoelectric ceramics could effectively enhance the electrical output of PEHs.

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Effect of iron and tungsten substitution on the dielectric response and phase transformations of BaTiO 3 pervoskite ceramic

Bourguiba

Dhahri

Rhouma

et al. 2016

Journal of Alloys and Compounds

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Effects of lanthanum dopants on the Curie–Weiss and the local order behaviors for Pb1−xLax(Fe2/3W1/3)0.7Ti0.3O3 relaxor ferroelectrics

Cited by 8 publications

References 41 publications

Relaxor Behavior of Lead-Free Nonstoichiometric (Na_0.48-xK_0.48-xLi_0.04)Nb_0.89-xTa_0.05Sb_0.06O₃-xSrTiO₃Ceramics

Relaxor Behavior of Lead-Free Nonstoichiometric (Na_0.48-xK_0.48-xLi_0.04)Nb_0.89-xTa_0.05Sb_0.06O₃-xSrTiO₃Ceramics

Optimizing energy harvesting performance by tailoring ferroelectric/relaxor behavior in KNN-based piezoceramics

Effect of iron and tungsten substitution on the dielectric response and phase transformations of BaTiO 3 pervoskite ceramic

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Effects of lanthanum dopants on the Curie–Weiss and the local order behaviors for Pb1−xLax(Fe2/3W1/3)0.7Ti0.3O3 relaxor ferroelectrics

Cited by 8 publications

References 41 publications

Relaxor Behavior of Lead-Free Nonstoichiometric (Na0.48-xK0.48-xLi0.04)Nb0.89-xTa0.05Sb0.06O3-xSrTiO3Ceramics

Relaxor Behavior of Lead-Free Nonstoichiometric (Na0.48-xK0.48-xLi0.04)Nb0.89-xTa0.05Sb0.06O3-xSrTiO3Ceramics

Optimizing energy harvesting performance by tailoring ferroelectric/relaxor behavior in KNN-based piezoceramics

Effect of iron and tungsten substitution on the dielectric response and phase transformations of BaTiO 3 pervoskite ceramic

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Relaxor Behavior of Lead-Free Nonstoichiometric (Na_0.48-xK_0.48-xLi_0.04)Nb_0.89-xTa_0.05Sb_0.06O₃-xSrTiO₃Ceramics

Relaxor Behavior of Lead-Free Nonstoichiometric (Na_0.48-xK_0.48-xLi_0.04)Nb_0.89-xTa_0.05Sb_0.06O₃-xSrTiO₃Ceramics