JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2022
·Vol. 33
·期 21
·17258-17271
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IF 2.779
Zhou Chuang,Cai Wei,Yang Xue,Zhang Qianwei,Chen Dakai,Wang Yaohan,Huang Rui,Du Mingchao,Gao Rongli,Chen Gang,Deng Xiaoling,Wang Zhenhua,Lei Xiang,Fu Chunlin
(K,Na)NbO 3 − x at.% Tm 2 O 3 (KNNT x ) piezoelectric ceramics with submicron grain size were successfully prepared by solid-state method combined with microwave sintering. With the increase of content of Tm 3+ , KNNT x ceramics gradually transformed from orthorhombic (O) phase to the coexistence of O and tetragonal (T) phase at room temperature, and the phase transition temperature of O–T phase shifted to low temperature region. The leakage behaviors, dielectric, ferroelectric, and piezoelectric properties of KNNT x ceramics depend on the structure evolution, cationic vacancy and grain refinement caused by Tm 3+ doping, and the relevant mechanisms have been illustrated. The substitution of Tm 3+ at A sites increases the critical driving force for the rapid growth of grains and obviously refine the grain of KNNT x ceramics, resulting in its deteriorated ferroelectricity and enhanced piezoelectricity. Especially the piezoelectric constant of KNNT x ceramics increased from 109.8 to 163.6 pC/N. These findings are of great significance for developing excellent lead-free piezoelectric materials.
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
International Journal of Minerals Metallurgy and Materials
·
2023
·Vol. 30
·期 10
·2044-2054
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IF 4.8
Zhou Min,Liang Laijun,Lu Dingze,Lu Xiaomei,Wang Zheng,Huang Fengzhen,Cheng Pengfei,Liu Dongdong,Tian Mengqi,Wang Qiuping,Zhang Yunjie
Piezocatalysis has attracted unprecedented research interest as a newly emerging catalysis technology. However, the inherent insulating property of ferroelectric materials ultimately leads to the poor vibration–electricity conversion ability. Herein, this work reports the (K 0.52 Na 0.48 )NbO 3 ferroelectric ceramics (KNNFC x ), for which the FeCo modification strategy is proposed. The substitution of the moderate amount of FeCo ( x = 0.015) at Nb site not only optimizes ferroelectricity but also produces beneficial defects, notably increasing Rhodamine B water purification efficiency to 95%. The pinning effect of monovalent oxygen vacancies on ferroelectric domains is responsible for the excellent ferroelectric polarization of KNNFC0.015 through the generation of an internal field to promote charge carriers separation and reduce non-radiative recombination. Importantly, the accompanying electron carriers can easily move to the material surface and participate in redox reactions because they have low activation energy. Therefore, ferroelectric polarization and defects play synergetic roles in enhancing piezocatalytic performance.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
Scientific Reports
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2016
·Vol. 6
·期 1
·1-12
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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
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
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DOI
PubMed
高影响因子
RSC Advances
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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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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Junqin Mao,Heng Zheng,Qiuyu Zeng,Xinyu Zhang,Tao Shen,Yutong Zhang,Guoyu Lv
This study presents the development and characterization of a bioactive and piezoelectric ceramic composite composed of 45S5 bioactive glass (BG) and potassium-sodium niobate (KNN) for bone repair applications. BG-KNN ceramics with varying BG contents (0, 10, 20, and 30 wt%) were synthesized via a solid-state reaction, and their physicochemical, piezoelectric, and biological properties were comprehensively evaluated. Results indicated that incorporating moderate BG content (20 wt%) significantly enhanced the piezoelectric response (d 33 = 50 pC/N) and promoted cell proliferation, attributed to the balanced ionic dissolution and optimized microstructure. In contrast, excessive BG doping (30 wt%) disrupted crystal order, reduced piezoelectric performance, and induced cytotoxicity due to alkaline pH shifts and ionic imbalance. The optimized 20BG-KNN ceramics demonstrated superior bioactivity, optimal piezoelectric properties, and favorable biocompatibility, underscoring their potential as multifunctional materials for advanced bone regeneration strategies.
研究领域:
材料科学
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生物医学工程
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陶瓷材料
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组织工程
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生物活性
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）