Scientific Reports
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2016
·Vol. 6
·期 1
·1-12
·
IF 5.228
Huan Yu,Wang Xiaohui,Koruza Jurij,Wang Ke,Webber Kyle G.,Hao Yanan,Li Longtu
Miniaturization of domains to the nanometer scale has been previously reported in many piezoelectrics with two-phase coexistence. Despite the observation of nanoscale domain configuration near the polymorphic phase transition (PPT) regionin virgin (K 0.5 Na 0.5 )NbO 3 (KNN) based ceramics, it remains unclear how this domain state responds to external loads and influences the macroscopic electro-mechanical properties. To this end, the electric-field-induced and stress-induced strain curves of KNN-based ceramics over a wide compositional range across PPT were characterized. It was found that the coercive field of the virgin samples was highest in PPT region, which was related to the inhibited domain wall motion due to the presence of nanodomains. However, the coercive field was found to be the lowest in the PPT region after electrical poling. This was related to the irreversible transformation of the nanodomains into micron-sized domains during the poling process. With the similar micron-sized domain configuration for all poled ceramics, the domains in the PPT region move more easily due to the additional polarization vectors. The results demonstrate that the poling process can give rise to the irreversible domain configuration transformation and then account for the inverted macroscopic piezoelectricity in the PPT region of KNN-based ceramics.
研究领域:
材料科学
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物理学
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DOI
高影响因子
INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Jie Wu,Gaochao Zhao,Wei Dong,Chengbing Pan,Kun Tao,Wenjuan Huang,Peng Tong,Jie Yang,Xuebin Zhu,Lihua Yin,Wenhai Song,Yuping Sun
The effects of quenching on the structural, electrical, dielectric, ferroelectric (FE), and piezoelectric properties are investigated systematically in the 0.85BiFe1-xCrxO3-0.15BaTi1-xMnxO3 (0 ≤ x ≤ 0.03) ceramics. Optimal piezoelectricity and FE Curie temperature are obtained through optimized quenching rate and temperature. Quenching effect on piezoelectricity is especially significant for the samples near morphotropic phase boundaries (MPB), which can be ascribed to quenching-induced changes in phase ratio (rhombohedral and tetragonal phase) and domain structure/defect dipole orientation. Moreover, a new poling method, that is, cooling the sample at a constant dc current across FE TC, is established to improve the piezoelectricity. This work not only reveals the possible mechanism of quenching effect on the improved piezoelectricity in the BFO-based piezoceramics (especially near the MPB) but also suggests an electric current poling strategy for improving piezoelectricity by suppressing the defect dipole effects in BFO-based and even other piezoelectrics.
研究领域:
材料科学
·
物理学
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产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Yuanshui Liu,Feng Luo,Denghui Jiang,Linzhuang Xing,Liwei Song,Zhimin Li
Lead-based Pb(Zr, Ti)O 3 ceramics have been widely applied in piezoelectric actuators, and yet high temperature stability and large strain have been pursued for further application. In this work, a novel PbZrO 3 –PbTiO 3 -(Bi 0.5 Na 0.5 )TiO 3 (PZ-PT-BNT) piezoelectric ceramic is designed and prepared by solid-state route. It is found that the introduction of BNT constituent enhances the relaxation behavior of PZ-PT ceramic, inhibits the abrupt change in dielectric properties near Curie temperature , and increases the proportion of tetragonal phase with high temperature stability. Meanwhile, the patterns of electric domains are intentionally modified by adjusting composition of PZ-PT-BNT. Short and broad electric domains in PZ-PT-0.03BNT ceramic are observed by piezoresponse force microscopy, which are insensitive to temperature and have faster response under electric field, contributing to strain characteristics. As a result, through integrating phase structure and electric domain configuration, a strain of 0.21% and excellent temperature stability where the variation of strain is less than 8% in the temperature range of 25–250 °C are achieved in PZ-PT-0.03BNT ceramic. The findings provide an effective strategy for improving the strain stability of PZ-PT-based piezoelectric ceramics, and demonstrate that PZ-PT-BNT ceramics have potential application prospects in high-temperature piezoelectric actuators.
研究领域:
材料科学
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电子工程
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DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 34
·期 12
·2310407
·
IF 19
Yipeng Song,Hongwei Yu,Bingxuan Li,Xiaoqi Li,Yang Zhou,Yanqiang Li,Chao He,Ge Zhang,Junhua Luo,Sangen Zhao
Phase matching is indispensable for high efficiency of second-order nonlinear optical (NLO) crystals. Thousands of these crystals rely on birefringence phase matching, whereas only a few of them are quasi-phase matching without the restriction of birefringence. Herein, using oriented seeds inch-sized LiNH 4 SO 4 (LAS) single crystals are successfully grown. LAS is NLO-active with a very short deep-UV absorption edge of 171 nm and high laser damage threshold up to 1.47 GW cm −2 at 1064 nm, 10 ns, but its birefringence is merely 0.0078@532 nm, which is too small to realize birefringence phase matching in deep-UV region. Fortunately, P − E hysteresis loop, variable-temperature NLO tests, and ferroelectric domain observations confirm that LAS is ferroelectric. Furthermore, LAS exhibits small refractive index dispersion resulting in a relatively long periodic length of 1.4 µm and its single domain structure can be easily obtained by electrical poling. These attributes make LAS a scarce NLO candidate for deep-UV quasi-phase matching. This work highlights the longly overlooked potential of sulfates and provides new opportunities for deep-UV NLO materials.
研究领域:
材料科学
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光学工程
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凝聚态物理
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无机化学
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DOI
高影响因子
Journal of Materials Chemistry A
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2025
·
IF 9.5
Yingzhi Meng,Zhaojie Wang,Xiang Niu,Yuleng Jiang,Peng Nong,Silin Tang,Jiyang Xie,Wanbiao Hu,Dingyuan Wang,Biaolin Peng,Shengguo Lu,Laijun Liu
The development of high-performance electrocaloric effect (ECE) is of great importance for local refrigeration (such as chip and wearable electronics cooling, etc.). However, how to simultaneously achieving both a large ECE and a wide working temperature range near the room temperature are long-term challenges for lead-free ceramics. Herein, we report a novel lead-free ceramic with a high-performance ECE. Phase coexistence and optimized ferroelectric domain configuration and ultra-fine grains were constructed by {Nb 5+ , In 3+ } co-doping in B 0.9 Ca 0.1 TiO 3 ceramics near the room temperature. Ultimately, an ultrahigh ECE of 3.0 K and a wide working temperature range of 97 K are obtained near the room temperature in the composition (B 0.9 Ca 0.1 Ti 0.89 (Nb 0.5 In 0.5 ) 0.11 O 3 ). Furthermore, the origin of the high ECE performance was elucidated by the microstructures characterized using piezoresponse force microscopy (PFM) and atomic-resolution HAADF-STEM, and the dielectric and ferroelectric properties. This work provides an innovative approach for achieving high-performance ECE.
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2015
·Vol. 41
·期 4
·5498-5504
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IF 2.605
Shizhou Pu,He Zheng,Zhenlian Chen,Meiya Li,Zhongqiang Hu,Jianbo Wang,Huamin Zou
The microstructures of Bi 0.85 Nd 0.15 FeO 3 ceramics were investigated by using transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), selected area electron diffraction (SAED), convergent-beam electron diffraction (CBED) and X-ray energy dispersive spectrometry (EDS). The superstructure phase related to 1/4( hh 0) p and 1/4(00 l ) p diffraction spots were observed in the samples. It is found that the superstructure phase can co-exist with R 3 c phase in a single grain. The bright and dark field images accompanied with SAED patterns provided evidences of the superstructure phase dispersed into the matrix with R3c symmetry and evolution of the domain. The ferroelectric domain wall was observed according to the displacement of Fe 3+ ions respect to Bi 3+ sub-lattice in the ferroelectric R 3 c phase based on HRTEM observations. The space group Pnam of the superstructure was identified by combining SAED and CBED techniques . EDS measurement revealed that the concentration of Nd in the Pnam phase is higher than that in R 3 c phase. This might mean that the transition from R 3 c to Pnam structure is due to the inhomogeneous distribution of the Nd concentration and the weakened stereochemical activity of Bi 3+ lone electron pair, arisen from the increase in Nd content.
研究领域:
材料科学
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凝聚态物理
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功能陶瓷
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电子显微学
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铁电材料
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多铁材料
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Zhe Zhu,Zhonghua Yao,Xinhui Li,Rui Zhao,Ruiling Chang,Hua Hao,Minghe Cao,Hanxing Liu
The quenching process is investigated to modulate domain structures behaviors in three ceramic compositions: lead zirconate titanate with a 75/25 zirconium titanium ratio (75/25PZT), Mn-doped (Mn-75/25PZT) and Nb-doped (Nb-75/25PZT). Piezoresponse force microscopy (PFM) demonstrates a transformation of domain structures from micron to nanoscale, accompanied by increased domain walls (DWs) density. In-situ Raman spectroscopy detects a softening of the E (TO1) vibration mode after quenching, indicating lower DWs energy density and higher internal stress. Furthermore, both 75/25PZT and Mn-75/25PZT demonstrate the release of pinched hysteresis loops, coupled with substantial enhancements in piezoelectric coefficients of 36 % and 37 %, respectively. Additionally, both reversible and irreversible dielectric responses are augmented through quenching. This investigation provides detailed insights into the evolution of domains during the quenching process in these ceramic systems.
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Junhui Lang,Mingwang Yuan,Yingzhi Meng,Silin Tang,Biao Zhang,Qingqing Ke,Laijun Liu
Piezoelectric energy harvesters (PEHs) have attracted much attention due to their efficient harvesting of vibrational energy from the ambient environment, which demonstrates great potential applications. Unfortunately, their low energy density severely hinders the further development of PEHs. Therefore, it is highly desirable to search for piezoelectric materials with a high transduction coefficient (d33 × g33). In this work, an excellent d33 × g33 is achieved in Pb0.94(La0.06-xNdx) (Zr0.58Ti0.42)0.985O3 (x = 0, 0.01, 0.02, 0.03, and 0.04) (PL0.06-xNxZT) ceramics by composition modulation. The best d33 × g33 of 26.71 pm2/N is obtained with an optimal composition of x = 0.02. Moreover, a superior output voltage of 28.4Vp and power density of 15.93 μW/mm3 are simultaneously obtained for the sample applied in the PEH system. The sizes of the polar nanodomains of the samples are estimated using a phenomenological statistical model, and the domain configuration is observed using PFM. Our results indicate that composition modulation in PLZT can regulate and awaken ferroelectric domains, giving rise to an ultrahigh d33 × g33, which consequently results in enhanced performance of the output voltage and power density of PEHs.
研究领域:
材料科学
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压电能量收集
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陶瓷
·
功能材料
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产品关联
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Hao-Ran Chen,Min Wan,Zi-Mu Li,Wen-He Zhong,Si-Yu Ye,Qiang-Qiang Jia,Jun-Yi Li,Li-Zhuang Chen
Molecular ferroelectric materials are widely applied in piezoelectric converters, non-volatile memorizers, and photovoltaic devices due to their advantages of adjustable structure, lightweight, easy processing, and environmental friendliness. However, designing multifunctional molecular ferroelectrics with excellent properties has always been a great challenge. Herein, a multiaxial molecular ferroelectric is successfully designed by modifying the quasi-spherical cation dabco with CuBr2 to obtain halogenated [Bretdabco]CuBr4 (Bretdabco = N-bromoethyl-N′-diazabicyclo [2.2.2]octane), which crystallizes in polar point groups (C6). Typical ferroelectric behaviors featured by the P–E hysteresis loop and switched ferroelectric domain are exhibited. Notably, the molecular ferroelectric shows a high TC of 460 K, which is rare in the field and could greatly expand the application range of this material. In addition, the band gap is adjustable through the regulation of halogen. Both the UV absorption spectra and theoretical calculations indicate that the molecular ferroelectrics belong to a direct band gap (2.14 eV) semiconductor. This tunable and narrow band gap semiconductor molecular ferroelectric material with high TC can be utilized more effectively in the study of optoelectronics and sensors, including piezoelectric energy harvesters. This research may provide a promising approach for the development of multiaxial molecular ferroelectrics with a tiny band gap and high TC.
研究领域:
材料科学
·
电陶瓷
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铁电材料
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光电
·
半导体物理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）