Influence of different lanthanide ions on the structure and properties of potassium sodium niobate based ceramics

Xing, Jie; Xie, Shaoxiong; Wu, Bo; Tan, Zhi; Jiang, Laiming; Xie, Lixu; Cheng, Yuan; Wu, Jiagang; Xiao, Dingquan; Zhu, Jianguo

doi:10.1016/j.scriptamat.2019.10.036

Cited by 31 publications

(15 citation statements)

References 25 publications

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“…29,30 The physics of resin flow into a mold under pressure is similar to the seepage problem and so similar approaches have been used also to model the flow of resin into a mold containing fiber mats. 23,[31][32][33][34][35][36][37][38] The models are used in these cases to determine the resin flow front and mold filling times corresponding to different infiltration conditions.…”

Section: Resultsmentioning

confidence: 99%

“…Negative strain (S neg ) involves non-180°domain reorientation. 33 Figure 8B presents the variation in piezoelectric properties for the ceramics with the increase in Sr 2+ substitution content. As increasing the x, piezoelectric constant (d 33 ) and electromechanical coupling coefficient (k p ) increase and simultaneously reach the maximum values of 623 pC/N and 0.70 at x = 0.6 respectively.…”

Section: Methodsmentioning

confidence: 99%

“…29,30 The physics of resin under pressure is similar to the seepage pr lar approaches have been used also to mod into a mold containing fiber mats. 23,[31][32][33][34][35][36][37][38] T in these cases to determine the resin flow ing times corresponding to different infilt Preceramic polycarbosilane polymers as precursors to make ceramic fibers 10,3 trix. [7][8][9]40,41 The chemical and volume ch pany ceramization of the polymer during documented in several studies.…”

Section: Introductionmentioning

confidence: 99%

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Phase, domain, and microstructures in Sr²⁺ substituted low‐temperature sintering PZT‐based relaxor ferroelectrics

Chen

Xing

et al. 2021

J Am Ceram Soc.

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The Ag-Pd internal electrode of multilayer piezoelectric ceramics needs to be sintered below 1000°C, and lead wires and components need to be welded with leadfree solder at 260°C. PNN-PMW-PZT-xSr piezoelectric ceramics with high Curie temperature (T c > 260°C) were synthesized at a low sintering temperature (960°C) to meet the requirements of multilayer piezoelectric devices. The relationship between structures (phase, domain, and microstructures) and electrical properties (piezo/ferroelectric properties, and dielectric relaxation) in the Sr 2+ substituted ceramics was investigated. Rietveld refinement and Raman spectra show that Sr 2+ substitution can cause the phase change and increase the force constant of [BO 6 ] octahedron. The piezoelectric response increases with increasing the content of the tetragonal phase (CTP) in the rhombohedral-tetragonal (R-T) coexisted ceramics. The ceramics with 0.6 mol% Sr 2+ substitution have minimum activation energy for domain wall movement (E a ) of 0.0362 eV which favors the formation of nanometer-sized domains, and possess excellent electrical properties (d 33 = 623 pC/N, d 33 * =783 pm/V, T c =295°C).The higher the CTP, the lower the E a . The lower E a favors the rotation of polarization direction and extension, and is beneficial to the generation of the nanometer-size domains, resulting in high piezoelectric properties.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Phase, domain, and microstructures in Sr²⁺ substituted low‐temperature sintering PZT‐based relaxor ferroelectrics

Chen

Xing

et al. 2021

J Am Ceram Soc.

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“…where e m is the maximum dielectric permittivity value, γ is the degree of diffuseness, and C is the Curie-Weiss constant [31].…”

Section: Resultsmentioning

confidence: 99%

Enhanced electrocaloric effect in compositional driven potassium sodium niobate‐based relaxor ferroelectrics

Zhang

Zheng

Zhao

et al. 2021

Journal of Materials Research

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Lead-free ferroelectric electrocaloric ceramics that could convert electrical energy into heat are the promising candidate for environment-friendly cooling devices. For refrigeration devices, a large temperature change (ΔT ) and good temperature stability are required, which are highly related to the phase structure and the applied electric field. In this work, a diffused ferroelectric-paraelectric (FP) phase transition is formed in (K, Na)NbO 3 (KNN) by using appropriate composition engineering. The relaxor ferroelectrics in this work present both a large ΔT of 1.24 K and a high ΔT/ΔE of 0.19 K mm/kV. In addition, a wide temperature span exceeds 55°C at the high electrocaloric effect (ECE) criterion (ΔT ≥ 0.5 K) could also be observed. This work not only opens a new strategy for obtaining high-performance ceramics for refrigeration devices but also extends the application area of the KNN-based lead-free ferroelectrics from sensors, actuators and energy harvesting to solid-state cooling applications.

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“…This sustained interest is mainly due to the special outer electronic structure of rare‐earth ions 1 . Doping rare‐earth ions into the functional ceramics can not only improve the sintering, densification, strength and high temperature stability, 2,3 but also significantly improve some functionalities, such as electrical properties, 4‐6 magnetic properties, 7,8 dielectric properties, 9‐11 superconductivity properties and photocatalytic properties, 12‐14 etc. These improvements for the physical or chemical properties of ceramics are highly desirable in many applications.…”

Section: Introductionmentioning

confidence: 99%

Microstructural and electrical changes in Ca_0.9R_0.1CeNbMoO₈ (R = Y, Sm, Nd, La) ceramics induced by rare‐earth ion doping

Liu

Chen

et al. 2021

J. Am. Ceram. Soc.

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Rare‐earth ions doped Ca0.9R0.1CeNbMoO8 (R = Y, Sm, Nd, La) ceramics have been successfully prepared by solid‐state method, and their modifications to the microstructure and electrical properties are also investigated. The rare‐earth ions doped ceramics exhibit the scheelite structure. With the increase in the radius of rare‐earth ions, the lattice distortion and bond interaction will be enhanced, and the consistency of grain size will be reduced. The ceramics exhibit negative temperature coefficient (NTC) thermistor characteristics in the temperature range of 473 K‐1273 K, and the activation energy decreases with the increase of the radius of rare‐earth ions. Rare‐earth ions doping can increase the content of Ce3+ ions and promote the conductivity of ceramics. Except for Sm3+‐doped ceramics, the high‐temperature aging rate of other ceramics is less than 2%. The existence of some metastable Sm2+ ions in Sm3+‐doped ceramics not only increases the activation energy, but also reduces the high‐temperature stability of the ceramics.

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Influence of different lanthanide ions on the structure and properties of potassium sodium niobate based ceramics

Cited by 31 publications

References 25 publications

Phase, domain, and microstructures in Sr²⁺ substituted low‐temperature sintering PZT‐based relaxor ferroelectrics

Phase, domain, and microstructures in Sr²⁺ substituted low‐temperature sintering PZT‐based relaxor ferroelectrics

Enhanced electrocaloric effect in compositional driven potassium sodium niobate‐based relaxor ferroelectrics

Microstructural and electrical changes in Ca_0.9R_0.1CeNbMoO₈ (R = Y, Sm, Nd, La) ceramics induced by rare‐earth ion doping

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Influence of different lanthanide ions on the structure and properties of potassium sodium niobate based ceramics

Cited by 31 publications

References 25 publications

Phase, domain, and microstructures in Sr2+ substituted low‐temperature sintering PZT‐based relaxor ferroelectrics

Phase, domain, and microstructures in Sr2+ substituted low‐temperature sintering PZT‐based relaxor ferroelectrics

Enhanced electrocaloric effect in compositional driven potassium sodium niobate‐based relaxor ferroelectrics

Microstructural and electrical changes in Ca0.9R0.1CeNbMoO8 (R = Y, Sm, Nd, La) ceramics induced by rare‐earth ion doping

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Product

Resources

About

Phase, domain, and microstructures in Sr²⁺ substituted low‐temperature sintering PZT‐based relaxor ferroelectrics

Phase, domain, and microstructures in Sr²⁺ substituted low‐temperature sintering PZT‐based relaxor ferroelectrics

Microstructural and electrical changes in Ca_0.9R_0.1CeNbMoO₈ (R = Y, Sm, Nd, La) ceramics induced by rare‐earth ion doping