JOURNAL OF ALLOYS AND COMPOUNDS
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2025
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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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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Wangzhe Leng,Yanyu Liu,Shu Li,Xinyao Geng,Lu Liu,Yi Du
With the rapid development of broadband transducers, there is an increasing demand for enhanced electromechanical properties in lead-free piezoelectric ceramics. In this study, the strategies to enhance the electrical properties of ceramics were explored by doping BaZrO 3 into 0.96(K 0.48 Na 0.52 )Nb 0.96 Sb 0.04 O 3 -0.04(Bi 0.5 Ag 0.5 )ZrO 3 ceramics, inducing lattice distortion ( c / a ) and regulating the phase structure. The ceramics doped with 1.5 mol% BaZrO 3 demonstrate excellent electrical performance, with a piezoelectric coefficient ( d 33 ) of 545 pC/N, a relative dielectric constant ( ε r ) of 4126, and an electromechanical coupling factor ( k p ) of 54.1 %. The reduced c / a ratio and rhombohedral-orthorhombic-tetragonal phase structure reduce the polarization energy barrier and promote the ordered arrangement of ferroelectric dipoles, thereby enhancing the comprehensive performance of the ceramics. Lastly, the electrical impedance of ceramics is studied in detail and reveals the main conduction mechanism in the microscopic region. This research provides new insights into optimizing the electrical properties of ceramics through microstructural manipulation and demonstrates the potential application of KNN-based ceramics in high performance piezoelectric transducers.
研究领域:
材料科学
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电陶瓷
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压电材料
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DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2022
·Vol. 106
·期 5
·2953-2962
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IF 4.186
Zhihao Dong,Peiyao Zhao,Zhenyong Cen,Xiaohui Wang
On the road of lead-free piezoelectric ceramics into practical applications, the study of Ni-internal-electrode (K, Na)NbO 3 -based (KNN-based) multilayer actuators (MLAs) is an important part, possessing the advantages of environmentally friendly and low cost. The Ni-internal-electrode KNN-based MLAs with different layer numbers and layer thicknesses were fabricated via the tape casting method and sintered in the reducing atmosphere. The piezoelectric layers consist of the main KNN-based phase and a trace amount of second phase Mn 4 Nb 2 O 9 . The element diffusion between the Ni electrodes and KNN-based grains is tiny, indicating that Ni is suitable for co-firing with KNN-based ceramics. After sintering, the compressive stress perpendicular to the thickness direction and the “relative tensile stress” parallel to the thickness direction are retained in the MLAs, bringing influences on the piezoelectric and dielectric properties of KNN-based materials. Compared with the bulk ceramics, the prepared MLAs significantly reduce the driving voltages and increase the displacement outputs, which are more applicable to the scenarios of miniaturization and portability. Particularly, the 46-layer actuator shows high displacements of 1580 and 2737 nm under the voltages of 100 and 200 V, respectively. However, the inverse piezoelectric coefficient d 33 * for each layer of MLAs is still lower than that of the bulk ceramics, indicating that the piezoelectric properties of the KNN-based materials are suppressed. To give full play to the piezoelectric properties of KNN-based materials, more attentions should be paid to the design of reasonable electrode structure and the development of internal electrode paste for MLAs.
研究领域:
材料科学
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电陶瓷
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压电材料
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致动器
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DOI
高影响因子
Coatings
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2022
·Vol. 12
·期 4
·526
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IF 3.236
Jiaqi Li,Junjun Wang,Fengmin Wu,Hui Ma,Tianyi Ma,Yu Tian,Danqing Liu,Bin Yang
In this paper, Bi2O3-doped (K0.5Na0.5)NbO3(x = 0.1, 0.2, 0.3, 0.4) lead-free ceramics are prepared by a conventional solid-state reaction and analyzed by studying the structure, ferroelectric, and piezoelectric properties. It is found that the doping of Bi2O3increases the proportion of the trigonal phase in KNN ceramics, thus enabling the construction of KNN ceramics with an orthogonal–trigonal phase boundary at room temperature. At the same time, doping with Bi2O3can reduce the grain size and improve grain size uniformity of the ceramics. The KNN-0.1%Bi2O3ceramic has the best piezoelectric properties in all composition; the results are as follows:d33= 121pC/N,kp= 0.474,kt= 0.306.Keywords:KNN lead-free ceramics;Bi2O3doping;grain effects;piezoelectric property
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
·
2025
·Vol. 16
·期 1
·1-11
·
IF 15.7
Zhang Tao,Hu Haoyuan,Jiang Hong,Wang Zhen,Lin Jinfeng,Cheng Ye,Guo Wei,Ke Di,Hang Hai,Ta Mengshu,Ou-Yang Jun,Zhai Jiwei,Yang Xiaofei,Wang Songyun,Zhu Benpeng
High-performance lead-free K 0.5 Na 0.5 NbO 3 piezoelectric ceramics present a practical alternative to lead-containing counterparts by effectively reducing potential environmental hazards. This advancement is particularly relevant to the development of ferroelectric heterojunction devices for biomedical applications. Here, we design and fabricate a frequency-adjustable ferroelectric heterojunction based on the developed K 0.5 Na 0.5 NbO 3 piezoelectric ceramics with a high piezoelectric coefficient ( d 33 = 680 pC/N). By leveraging flexible encapsulation, the heterojunction achieves miniaturization ( φ = 13.3 mm, h = 2.28 mm) and suitability for implantation. After penetrating the rat skull, the ultrasound generated by the heterojunction at a frequency of 3 MHz reaches a focal depth of about 7.9 mm, a focal width of approximately 480 μm at −6 dB, and millimeter-scale continuous focal tuning (1.5 mm) within a narrow frequency range (2.7–3.3 MHz). Additionally, the implanted heterojunction enables long-term and high-precision transcranial neuromodulation, and consequently yields therapeutic effects in a myocardial infarction animal model. Collectively, this study highlights a viable strategy for developing and applying lead-free ferroelectric heterojunctions, expanding their potential in brain modulation, and providing new insights into clinical treatments of myocardial infarction.
研究领域:
材料科学
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生物医学工程
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电子学
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神经科学
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DOI
PubMed
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
OPTICAL MATERIALS
·
2022
·
IF 3.754
Jian Lu,Hui Lin,Ruijin Hong,Dawei Zhang
By the solid phase reaction method, pure KNN and KNN with different proportions halloysite nanotubes (HNTs) were prepared to study the photocatalytic hydrogen evolution performance under the UV light irradiation. The band gaps of KNN with HNTs are narrower than that of pure KNN. The absorbance of KNN in the ultraviolet region is significantly enhanced by the incorporation of HNTs, where the absorbance in the 200-300 nm region increased about 2 times. Compared with KNN, the conduction band edge of KNN-5wt%HNTs reduced from −1.13 eV to −1.18 eV, showing stronger reducing ability. The H 2 production rate of KNN with HNTs is much higher than that of the raw KNN without HNTs. The best H 2 production rate of KNN-5wt%HNTs is 31.28 μmol•g −1 •h −1 , approximate 4.48 times as high as the rate of pure KNN (6.98 μmol•g −1 •h −1 ), suggesting appropriate addition of HNTs can efficiently improve the H 2 production efficiency.
研究领域:
材料科学
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能源科学
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Jingwen Lv,Simeng Song,Yan Jiao,Zhaoyu Yang,Yilin Zhang,Yingjie Fan,Chunlin Song,Gang Liu
A novel strategy of enhancing the dielectric and energy storage properties of Na 0.5 Bi 0.5 TiO 3 –BaTiO 3 (NBT–BT) ceramics by introducing a K 0.5 Na 0.5 NbO 3 (KNN) ferroelectric phase is proposed herein, and its underlying mechanism is elucidated. The lead-free KNN ceramic decreases the residual polarisation and increases the electric breakdown strength of the NBT–BT matrix through the simultaneous modification of its A-sites and B-sites. The obtained NBT−BT− x −KNN ceramics have a perovskite structure with unifying grains. A bulk 0.9NBT–BT–0.1KNN ceramic sample with a thickness of 0.2 mm possesses a high energy storage density of 2.81 J/cm 3 at an applied electric field of 180 kV/cm. Moreover, it exhibits good insulation properties and undergoes rapid charge and discharge processes. Therefore, the obtained 0.9NBT–BT–0.1KNN ceramic can be potentially used in high-power applications because of its high energy density , good insulation properties, and large discharge rate.
研究领域:
材料科学
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能源存储
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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
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
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2026
·Vol. 109
·期 7
·e71005
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IF 4.2
Yaqi Wang,Yanqiang Li,Chengwu Li,Yalin Qin,Yongcheng Zhang
Transparent photochromic ceramics have attracted significant interest in optical data storage, smart windows, and anti-counterfeiting applications because of their ability to reversibly modulate transparency and color under light stimulation. Near-infrared (NIR) light processing has high practical value in security information protection and communication due to its intrinsic concealment and anti-interference properties. However, optical transparency, photochromic efficiency, and emission tunability are often difficult to optimize simultaneously. This trade-off makes it challenging to integrate these properties into a single material platform. In this study, a series of Nd 3+ -doped K 0.5 Na 0.5 NbO 3 transparent ferroelectric ceramics was fabricated via solid-state synthesis. These ceramics exhibit high transparency and intense NIR emission centered at approximately 1055 nm. Upon ultraviolet (UV) exposure, both optical transmittance and luminescence intensity decrease significantly, yet fully recover after thermal treatment at 150°C, indicating excellent reversibility and repeatability. XPS reveals that oxygen and cation vacancies generate F and V color centers that trap photocarriers and contribute to the observed bidirectional optical modulation. This work demonstrates a promising material system capable of dynamically tuning NIR fluorescence and transparency, offering strong potential for multifunctional optoelectronic devices such as optical switches, secure displays, and rewritable data storage technologies.
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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 22
·10875-10883
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IF 3.3
Cong Ding,Zhongfa Li,Wenjun Zhang,Jun Ou,Xue Wen,Chengyue Xin,Min Su
The optical properties of Mn4+-activated phosphors are heavily affected by the host and the related data are difficult to obtain, which makes quantitative design of novel phosphors with required wavelength particularly challenging. In the era of big data, computation is emerging as a vital complement to materials development. Compared with traditional calculation routes, machine learning (ML) models provide better solutions for the problems wherein understanding the underlying physics is complicated with sparse data. In this study, we developed six ML models based on a sparse and small data set to rapidly predict the peak emission wavelength of novel phosphors and use Recursive Feature Elimination (RFE) to select the best features. Among them, the K-nearest neighbors regression (KNN.r) algorithm using non-parametric regression technology can predict the value of the target variable based on the similarity between the target value and its spatial neighbors, which can tackle sparse data sets with no obvious linear relationship well and has the best prediction accuracy. These models were then used to predict 278 potential Mn4+-activated phosphor hosts extracted from the inorganic crystal structure database (ICSD), and 19 samples were selected to validate these methods. In order to overcome the lack of physical and chemical insight of KNN, a visual data analysis was carried out based on hierarchical clustering analysis (HCA), and the rule between the peak emission wavelength and the structure of host was proposed. Guided by the results of KNN and HCA, six samples were selected for the synthesis and characterization to verify our conclusions. The measured values of all these phosphors exhibit good agreement with the predicted results, suggesting the success of our methodology. Thus, the model established and the rule proposed in this paper provide a new pathway for the rapid discovery of novel phosphors.
研究领域:
材料科学
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光学
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数据科学
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DOI
高影响因子
Agriculture-Basel
·
2024
·Vol. 14
·期 11
·2041
·
IF 3.3
Yingying Zhou,Yixin Qiu,Zhipeng Li,Zhuang Miao,Changming Li,Chunyu Liu,Yong Tan
The storage time of rice determines its quality and nutritional value, and the longer the storage time, the greater the impact. In this study, different excitation wavelengths (405 nm, 365 nm, 310 nm) were used to detect the fluorescence spectrum of “Dongdao 12” brown rice. Support vector machine (SVM), K-nearest neighbor (KNN), and wide neural network (WNN) were used for modeling and analysis. Under the excitation of 310 nm, the accuracy of WNN classification is up to 99.2%. In order to reduce the scattering effect and other interference in the data, multiplicative scatter correction (MSC), standard normal variable (SNV), and Savitzky–Goray smoothing (SG) preprocessing methods were used. The results showed that SG + KNN classification achieved an accuracy of 99.3% under 310 nm excitation. In order to further improve the classification accuracy, the original spectrum and the preprocessed spectrum under different excitation light sources were fused. The classification accuracy of all methods was improved, and the original data fusion was combined with the WNN model to reach 100%. It shows that fluorescence spectroscopy has excellent potential in identifying rice storage years.
研究领域:
食品科学
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光谱学
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生物信息学
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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）