Nature Communications
·
2021
·Vol. 12
·期 1
·1-9
·
IF 14.919
Gao Xiaoyi,Cheng Zhenxiang,Chen Zibin,Liu Yao,Meng Xiangyu,Zhang Xu,Wang Jianli,Guo Qinghu,Li Bei,Sun Huajun,Gu Qinfen,Hao Hua,Shen Qiang,Wu Jinsong,Liao Xiaozhou,Ringer Simon P.,Liu Hanxing,Zhang Lianmeng,Chen Wen,Li Fei,Zhang Shujun
(K,Na)NbO 3 based ceramics are considered to be one of the most promising lead-free ferroelectrics replacing Pb(Zr,Ti)O 3 . Despite extensive studies over the last two decades, the mechanism for the enhanced piezoelectricity in multi-elements doped (K,Na)NbO 3 ceramics has not been fully understood. Here, we combine temperature-dependent synchrotron x-ray diffraction and property measurements, atomic-scale scanning transmission electron microscopy, and first-principle and phase-field calculations to establish the dopant–structure–property relationship for multi-elements doped (K,Na)NbO 3 ceramics. Our results indicate that the dopants induced tetragonal phase and the accompanying high-density nanoscale heterostructures with low-angle polar vectors are responsible for the high dielectric and piezoelectric properties. This work explains the mechanism of the high piezoelectricity recently achieved in (K,Na)NbO 3 ceramics and provides guidance for the design of high-performance ferroelectric ceramics, which is expected to benefit numerous functional materials.
研究领域:
材料科学
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物理学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
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2019
·
IF 2.752
Dafeng Zhang,Changhua Su,Hong Li,Xipeng Pu,Yanling Geng
Ag 2 O/K 0.5 Na 0.5 NbO 3 (Ag 2 O/KNN) piezophotocatalysts with different weight ratios of Ag 2 O to KNN were synthesized by a facile two-step method involving hydrothermal and precipitation methods. Ag 2 O particles were attached on the surface of KNN via a precipitation method. Ag 2 O/KNN composites exhibit better photoactivity than pure Ag 2 O and KNN under visible light irradiation. Moreover, under both irradiations of visible light and ultrasound, the piezophotocatalytic activity was further enhanced in comparison with photoactivity. Based on the experimental results, the improved piezophotocatalytic activities of Ag 2 O/KNN composites should be attributed to the formation of p-n heterojunction between Ag 2 O and KNN and the generation of external electric field of KNN, which leads to high separation rate of photo-induced charges. The photostability and corresponding piezophotocatalytic mechanism were discussed.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 52
·32974-32981
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IF 3.108
Jinxia Zhai,Qiyou Wang,Jinquan Zeng,Junqi Chen,Xin Yi,Zhifeng Shi,Guoxin Tan,Peng Yu,Chengyun Ning
Mineralization plays a crucial role in the formation and remodeling of bone and charge has a positive influence on the mineralization by manipulating apatite deposition. In this paper, micropatterned piezoelectric K0.5Na0.5NbO3 (MPK) was constructed via laser-irradiation induced micro-zonal phase transition to manipulate set-selective apatite deposition. Two types of piezoelectric micro-zones on polarized MPK showed different charge densities, namely, higher charge density zone (H-zone) and lower charge density zone (L-zone). The micro-zonal piezoelectric difference on negatively polarized MPK (N-MPK) was ascertained by scanning Kelvin probe force microscopy (SKPM). With the manipulation of spatial charge, apatite selectively deposited on H-zone rather than L-zone, forming stripped zonal distribution. The furry platelet morphology of apatite was observed by scanning electron microscopy (SEM). Energy-dispersive spectroscopy (EDS) mapping observation indicated selective distribution of Ca and P elements in apatite. Phase composition of deposited apatite also can be regulated effectively via X-ray diffraction (XRD), which confirmed the existence of hydroxyapatite phase. Meanwhile, the apatite was further identified as carbonated hydroxyapatite by X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FTIR). The feasible and convenient way of manipulating apatite deposition selectively with spatial charge realized by micro-zonal piezoelectric materials will inspire future development in biomimetic materials designation for biomedical applications.
研究领域:
生物材料学
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骨组织工程
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生物医学工程
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DOI
高影响因子
Crystals
·
2020
·Vol. 10
·期 8
·705
·
IF 2.404
Yunfeng Deng,Junjun Wang,Chunxiao Zhang,Hui Ma,Chungeng Bai,Danqing Liu,Fengmin Wu,Bin Yang
Structural, ferroelectric, dielectric, and piezoelectric properties of K0.5Na0.5NbO3-LiTaO3-xmol%MnO2lead-free piezoelectric ceramics with 0.0 ≤x≤ 0.3 were studied. The ceramic samples were synthesized through the conventional solid-state reaction method. The MnO2addition can reduce the sintering temperature of KNLNT ceramics. Compared with undoped KNLNT ceramic, the piezoelectric measurements showed that piezoelectric properties of K0.5Na0.5NbO3-LiTaO3-xMnO2were improved (d33= 251 pC/N) whenx= 0.1. In addition, KNLNT-xMnO2ceramics have largerPr(20.59~21.97 μC/cm2) and smallerEc(10.77~6.95 kV/cm), which indicates MnO2has excellent softening property, which improves the ferroelectric properties of KNLNT ceramics This work adds relevant information regarding of potassium sodium niobate K0.5Na0.5NbO3(KNN) when doped Li, Ta, Mn at the B-site.Keywords:KNLNT ceramics;MnO2doped;ferroelectricity;piezoelectricity
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
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2026
·Vol. 37
·期 5
·379
·
IF 3.2
Zheng Kai,Xie Ning,Zhu Li-Feng,Jin Jiao,Liu Pengfei
(K, Na)NbO 3 (KNN) is regarded as a promising lead-free piezoelectric candidates due to its high Curie temperature and environmental compatibility. However, its piezoelectric performance remains inferior to Pb-based ceramics, mainly due to the rigid lattice and high coercive field that restrict domain switching. In this study, CaHfO 3 was introduced to modify the perovskite structure of KNN through a homologous co-doping mechanism. The simultaneous substitution of Ca 2+ and Hf 4+ modifies the local bonding environment and induces lattice softening, which effectively reduces the coercive field and facilitates polarization switching. At the optimal composition of 0.95(K 0.5 Na 0.5 )NbO 3 -0.02(Bi 0.5 Na 0.5 )ZrO 3 -0.03CaHfO 3 (0.95KNN-0.02BNZ-0.03CHO), the ceramics exhibit significant improvements in both ferroelectric and piezoelectric properties, while maintaining a balanced Curie temperature. This work provides clear evidence that structural softening induced by Ca-Hf incorporation provides an effective materials design strategy for enhancing the performance of lead-free KNN-based ceramics, while the compositional limits and long-term device-level behavior require further investigation.
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产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2022
·Vol. 105
·期 11
·6744-6754
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IF 4.186
Zhihao Dong,Zhenyong Cen,Kezhen Hui,Ze Xu,Peiyao Zhao,Xiaohui Wang
With the goals of sustainable development adopted by more and more nations, the lead-free trend of multilayer ceramic actuators has become a widely recognized consensus. Sintering in a reducing atmosphere is a necessary approach for preparing lead-free ceramics co-fired with low-cost nickel internal electrodes. Herein, (1 − x )K 0.48 Na 0.52 Nb 0.96 Ta 0.04 O 3 – x Sr(Zr 0.5 Ti 0.5 )O 3 + 0.03ZrO 2 + 0.08MnO 2 (KNNT-SZT) ceramics were sintered in a reducing atmosphere using a solid-state reaction. The Sr(Zr 0.5 Ti 0.5 )O 3 (SZT) dopant decreased the Curie temperature T C and the O–T phase transition temperature. The enhanced diffuseness of the ferroelectric phase transition of KNNT-SZT ceramics is attributed to the element doping and the locally inhomogeneous microstructure. High inverse piezoelectric coefficients d 33 * of 883 and 787 pm/V were obtained for the 8- and 9-mol% SZT-doped samples, respectively. These results were attributed to the synergistic effect of ferroelectric domains with different sizes. The diffused O–T phase transition significantly improved the piezoelectric temperature stability of the 9-mol% SZT-doped sample, whose electric-field-induced strain decreased by <10% from room temperature (25°C) to 115°C. The cyclic fatigue test showed that >98% of the initial d 33 * was retained after 10 6 cycles of unipolar electrical loading. The KNNT-SZT ceramics sintered in a reducing atmosphere possessed excellent inverse piezoelectric properties and are expected to be applied in the field of multilayer ceramic piezoelectric actuators with base metal internal electrodes.
研究领域:
材料科学
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压电陶瓷
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电子材料
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陶瓷工艺
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可持续能源材料
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2026
·
IF 6.7
Yutong Zhang,Shuangdou Wu,Lingling Song,Junqin Mao
Piezoelectric biomaterials that convert mechanical stimulation into bioelectrical signals are attractive for bone regeneration because they mimic the native electromechanical environment of bone. In this study, a series of bioactive piezoelectric ceramics, x SrTiO 3 ·BG-KNN ( x = 0, 0.03, 0.06, 0.09), were fabricated via a solid-state reaction route by incorporating strontium titanate and 45S5 bioactive glass. The influence of SrTiO 3 content on phase structure, microstructure, piezoelectric output, and in vitro biocompatibility was systematically investigated. Among all compositions, 0.06 mol% Sr-doped sample exhibited an optimized microstructure with moderate porosity and refined grains, resulting in the highest piezoelectric coefficient (67 pC/N) and enhanced electrical output (Voc ≈ 1.2 V, Isc ≈ 30 nA) with minimal frequency dependence. All samples demonstrated good cytocompatibility (>80% cell viability) and good hemocompatibility (<1% hemolysis), supported by sustained bioactive Si ion release (1–2 mg/L). These results indicate that 0.06SrTiO 3 ·BG-KNN is a promising multifunctional piezoelectric bioceramic promising candidate for bone repair.
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DOI
高影响因子
Journal of the Australian Ceramic Society
·
2026
·
IF 2.1
Mu Yan,Wang Junjun,Wang Bingsen,Jiao Yufang,He Jian,Liu Meng,Sun Che,Yuan Shaoyang,Liu Danqing,Yang Wenlong,Liu Linjing,Wu Fengmin
To enhance the piezoelectric performance of the lead-free Bi 0.5 Na 0.5 TiO 3 -BaTiO 3 (BNT-BT) system, we introduced K 0.5 Na 0.5 NbO 3 (KNN) via synergistic composition modulation. A series of (0.94-x)BNT-0.06BT-xKNN (x = 0.01–0.04) ceramics were synthesized using a solid-state reaction method. The composition with x = 0.02 exhibited optimal performance, achieving a significantly improved piezoelectric coefficient ( d ₃₃ = 115 pC/N) and a high depolarization temperature ( T d = 138 °C). Comprehensive structural and electrical characterizations revealed that these enhancements originate from KNN-induced modifications, including the coexistence of rhombohedral and tetragonal phases, refined grain morphology, and optimized domain dynamics. This work demonstrates that KNN modification is an effective strategy for tailoring the functional properties of BNT-BT-based ceramics, positioning the optimized composition as a competitive lead-free piezoelectric candidate for advanced electromechanical applications.
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产品关联
DOI
高影响因子
Journal of Materiomics
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2026
·
IF 10.6
Xiao Ma,Zhihao Dong,Weichen Zhang,Ying Jiang,Xu Cheng,Limin Guo,Peiyao Zhao,Xiaohui Wang
Piezoelectric actuators are widely used industrial electronic devices. In recent years, driven by environmental concerns, lead-free piezoelectric materials, particularly KNN-based ceramics, have gained increasing attention. In this study, Mn-doped KNN piezoelectric ceramics were synthesized by the conventional solid-state reaction method and sintered in a reducing atmosphere. By employing a synergistic strategy involving defect dipoles and ferroelectric domain switching, a giant converse piezoelectric coefficient of 2676 pm/V and a strain of 0.67% are achieved in the KNNM ceramics under an electric field of 2.5 kV/mm. In our ceramic samples, no obvious strain enhancement attributable to electrobending is observed. The ceramic exhibits excellent thermal stability, with performance degradation of less than 10% from room temperature to 170 °C, and maintains favorable performance after 2 million fatigue cycles. Considering the combination of excellent piezoelectric properties, high temperature stability, superior fatigue resistance, and reduction resistance, KNNM ceramics are expected to facilitate the development of lead-free piezoelectric actuators compatible with base-metal internal electrodes.
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DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2025
·
IF 6.2
Zhihao Dong,Peiyao Zhao,Xiao Ma,Xiaohui Wang,Jian Jiao
The KNN-based Ni-internal-electrode multilayer piezoelectric actuators (MLAs) possess the advantages of environmental friendliness and low cost. However, the internal stresses in MLAs suppress the performance of ceramic materials and should be optimized for improving the comprehensive performances of MLAs. This study alleviated the generation of internal stresses in MLAs by modifying the electrode pastes and designing the shapes of the internal electrodes, increasing the inverse piezoelectric coefficient d 33 * to 450 pm/V. The temperature stability of MLAs is significantly improved compared to the bulk ceramics, indicating that the internal stresses can also play a positive role in MLAs. In addition, the MLAs experience only a 4.7 % decrease in d 33 * over 5 million fatigue cycles due to the possible delayed propagation of fatigue cracks. The improvement of material properties and the solution to application problems should complement each other, jointly promoting the practicality of lead-free piezoceramics.
研究领域:
材料科学
·
电子工程
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产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 14
·4837-4845
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IF 6.4
Yao Zhang,Chengpeng Hu,Yu Wang,Xiaolin Huang,Xuejie Sun,Mingxuan Liu,Bohan Xing,Xing Wen,Hao Tian
The improvement of piezoelectric properties is always a key issue in the study of piezoelectric materials. The construction of composition gradient (CG) is a novel method to improve piezoelectric properties. However, the physical mechanism of CG influence on the piezoelectric properties has to be analyzed further. We investigate the origin of the CG-affected piezoelectric property using a manganese-doped potassium sodium niobate single crystal (that is Mn: KNN) as a model system. The relationship between CG, microstructure and spontaneous polarization was explored by designing and growing Mn:KNN single crystals with different CGs. It is found that the built-in electric field (Ein) in single crystals is constructed by introducing the CG in the crystals. The large Ein induces a more ordered, large-sized striated domain structure. The Mn: KNN single crystal with a large CG has a uniform orientation of spontaneous polarization and large macro-piezoelectric properties (83 pC N−1). Therefore, it is important to explore the relationship between CG and the piezoelectric properties of single crystals in lead-free piezoelectric materials. The results can be used to further develop high-performance lead-free piezoelectric materials.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 14
·4775-4783
·
IF 6.4
Yaqi Wang,Pengkun Guo,Yanan Wang,Nengmeng Huo,Ruyi Sun,Yongcheng Zhang,Jun-Cheng Zhang,Yalin Qin
Transparent photochromic materials have attracted extensive attention in applications of optical information storage and optical switches, in which both high transparency and large switching contrast are required. In this work, K0.5Na0.5NbO3–xPr (x = 1.0, 2.0, 2.5, 3.0) ceramics were prepared by pressure-less sintering. When x ≥ 2.0, high transmittances (T) were achieved due to the small grain size and the highly symmetrical phase structure. Optimal transmittances of ∼72.9% at 900 nm and ∼73.9% at 2500 nm were obtained in the K0.5Na0.5NbO3–3Pr ceramic. The transmittance and photoluminescence intensity can be obviously modulated by photochromism and have been found to be closely related to the Pr doping amount. A high modulation ratio of luminescence intensity (ΔRL) of ∼ 81% was obtained by illumination in the transparent K0.5Na0.5NbO3–3Pr ceramic (with T ∼ 72.9% at 900 nm), while a modulation ratio of transmittance (ΔRT) of 29% was achieved in the transparent K0.5Na0.5NbO3–2Pr ceramic (with T ∼ 63.3% at 900 nm). The transmittance and photoluminescence intensity recover to the original state by heating and both the ΔRT and ΔRL show good stability when the ceramics are alternately modulated by illumination and thermal stimulation. The combination of high transparency and large switching contrast makes Pr-doped K0.5Na0.5NbO3 ceramics promising for optical information storage and optical switch applications.
研究领域:
材料科学
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光学
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陶瓷
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光子学
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功能材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）