JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 36
·1-9
·
IF 2.8
Fu Jinxin,Zhou Changrong,Chen Jun,Yu Dongyan,Wu Di,Li Qingning,Yuan Changlai,Xu Jiwen,Rao Guanghui
The incompatibility of the large piezoelectric response ( d 33 ) and high depolarization temperature ( T d ) in lead-free piezoelectric ceramics limited their practical applications. The most used modification methods for improving d 33 or T d commonly required a delicate control of complex compositions. Here, a strategy for simply changing the sintering temperature is used to defer the T d and increase d 33 simultaneously. The T d and d 33 of unmodified Bi 0.5 Na 0.5 TiO 3 -0.2Bi 0.5 K 0.5 TiO 3 (BNKT20) ceramics increase with increasing sintering temperature until both of them reach the maximum ( d 33 ~ 174pC/N, T d ~ 177 °C) at the sintering temperature of 1100 °C. In-depth analysis unveils the critical role of multiphase coexistence and oxygen vacancies in enhancing T d by optimizing sintering temperature. Meanwhile, increasing sintering temperature promotes large grain size with easy domain orientation, thus, yielding the improved d 33 . This work provides a simple and effective method to broaden the working range of Bi 0.5 Na 0.5 TiO 3 -based (BNT) piezoelectric ceramics at high temperature under the premise of realizing high piezoelectric properties.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Jian Guo,Binbin Tong,Yixuan Chen,Jianguo Chen,Jinrong Cheng
0.75BiFeO 3 -0.25BaTiO 3 (0.75BF-0.25BT) ceramics have been widely studied because of their high Curie temperature , good thermal stability and lead-free trait. The evolution of domain motion during electric poling and thermal depoling processes is closely related to the piezoelectric properties and thermal stability of ferroelectric ceramics . Herein, the non-180° domain reversals of 0.75BF-0.25BT ceramics in these two processes were investigated by an in situ XRD technique. The non-180° domain switching fraction during the poling and depoling processes was calculated quantitatively based on the (111) and (11 1 ‾ ) diffraction peaks. During the poling process, the non-180° domain reversal percentage N 111 and piezoelectric properties increase abruptly when the poling field exceeds 35 kV/cm and then saturate at the electric field of 50 kV/cm (N 111 reaches the maximum value of 59%). The domains switched under the poling electric field of 50 kV/cm are stable below 500 °C. The depoling temperature is sensitive to the domain switching fraction under different poling electric fields, and the ceramics under a strong poling field possess excellent thermal stability and high depolarization temperatures. This work revealed the relationship between the electric properties, domain switching, poling electric field, and depoling temperature in the 0.75BF-0.25BT ceramics, which may pave the way to enhancing the room temperature piezoelectric properties and their thermal stability.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Energy Materials
·
2021
·Vol. 11
·期 22
·2100601
·
IF 29.368
Kai Yang,Luyi Yang,Zijian Wang,Bin Guo,Zhibo Song,Yanda Fu,Yuchen Ji,Mingqiang Liu,Wenguang Zhao,Xinhua Liu,Shichun Yang,Feng Pan
In order to prepare electrodes with high mass loading and areal capacities, the key issue is to achieve depolarization for both ion and electron transfer on the electrode material surface. In this work, through copolymerization of xanthan gum (XG) and amorphophallus konjac gum (KG) followed by an ice-templating method, aligned electrodes with high areal mass loading of active materials are prepared. In addition to firmly holding active materials together, the prepared KG–XG copolymer also facilitates improved effective porosity as well as homogeneous dispersion of conductive agents (i.e., CNTs). Consequently, with minimum inactive components (i.e., binder and conductive agents), the proposed electrode structure delivers good cycling stability and rate capability under high areal loading (as high as 200 mg cm −2 ). The excellent electrochemical performance can be attributed to the unique aligned structure where the robust conductive network provides an efficient electron and lithium-ion pathway, and the homogenous porosity is beneficial for the electrolyte percolation, hence the reduced polarization during charge transfer. In addition, this electrode preparation method is found to be universal as it is suitable for various types of anode and cathode materials.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2022
·Vol. 15
·期 9
·3180
·
IF 3.748
Xingru Zhang,Yinan Xiao,Chao Yang,Yuandong Wu,Min Wen,Junke Jiao,Rui Li,Liyuan Sheng,Wenchang Tan
Depolarization behavior is one of the main shortcomings of (Bi0.5Na0.5)TiO3-based ceramics. Considering the undesirable efficiency of traditional modification methods, in this paper a series of 0–3 type ceramic composites 0.85(Bi0.5Na0.5)TiO3-0.11(Bi0.5K0.5)TiO3-0.04BaTiO3-xmol% ZnO (BNKT-BT-xZnO)) were synthesized by introducing ZnO nanoparticles. The results of the X-ray diffraction pattern (XRD) and energy dispersive spectroscopy (EDS) demonstrate that the majority of ZnO nanoparticles grow together to form enrichment regions, and the other Zn2+ions diffuse into the matrix after sintering. With ZnO incorporated, the ferroelectric–ergodic relaxor transition temperature,TF-R,and depolarization temperature,Td,increase to above 120 °C and 110 °C, respectively. The research on temperature-dependentP–Eloops verifies an attenuated ergodic degree induced by ZnO incorporation. For this reason, piezoelectric properties can be well-maintained below 110 °C. The electron backscatter diffraction (EBSD) was employed to investigate the stress effect. Orientation maps reveal the random orientation of all grains, excluding the impact of texture on depolarization. The local misorientation image shows that more pronounced strain appears near the boundaries, implying stress is more concentrated there. This phenomenon supports the hypothesis that potential stress suppresses depolarization. These results demonstrate that the depolarization behavior is significantly improved by the introduction of ZnO. The composites BNKT-BT-xZnO are promising candidates of lead-free ceramics for practical application in the future.Keywords:BNT-based ceramic composite;depolarization behavior;electric properties;stress;ZnO incorporation
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2019
·Vol. 166
·期 13
·E401
·
IF 3.12
Handong Jiao,Shuqiang Jiao,Wei-Li Song,Haosen Chen,Mingyong Wang,Jiguo Tu,Daining Fang
Owing to the low-cost and fast process, molten salt electrolysis is considered as a novel method to replace the Kroll process for preparing titanium. However, this process has not been fully realized because of the multi-step reduction and complicated disproportionation behaviors of multivalent titanium ions in melt. To address such critical problems, here we use liquid metals (Sn and Pb) as the cathode instead of solid metal cathode (Mo) during the electrolysis, in which the reduction process of Ti3+ (TiF63−) becomes a simple one-step process (Ti3+ + 3e = Ti (alloys)). Also, the deposition potential is more positive (>0.5 V) than that using solid Mo, owing to the depolarizing effect of the liquid metals. One-step process and depolarization behavior are favorable to increase the current efficiency, effectively decreasing the power consumption in comparison with the conventional electrolysis at solid metal cathodes. Similar to the electrolytic production of aluminum in Hall-Heroult system, there would be a continuous electrolysis process because the product is liquid alloy in this system.
研究领域:
材料科学
·
电化学工程
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Jun Chen,Changrong Zhou,Huihui Liu,Qingning Li,Changlai Yuan,Jiwen Xu,Jiang Wang,Jingtai Zhao,Guanghui Rao
An imminent challenge of lead-free Bi0.5Na0.5TiO3-based (BNT) piezoceramics is that the giant piezoelectric constant (d33) caused by the morphotropic phase boundary is incompatible with a high depolarization temperature (Td) and ultralow temperature coefficient (Ttc) of the real-time d33, which severely hinders their industrial application in the field of elevated temperatures. Herein, a sandwich-structured 0.94Bi0.5Na0.5TiO3–0.06BaTiO3/0.89Bi0.5Na0.5TiO3–0.11BaTiO3/0.94Bi0.5Na0.5TiO3–0.06BaTiO3 (SWS-6/11/6BT-y, where y refers to the weight fraction of the BNT-11BT solid solution) ceramic composite is engineered for mitigating the conflict between d33, Td and Ttc. Following this strategy, ultrahigh Td near the Curie point (225 °C, close to that of the BNT-11BT layer) and relatively large d33 (130 pC/N, close to that of the BNT-6BT layer) are simultaneously realized in a SWS-6/11/6BT-40%-Q ceramic composite. More importantly, the ultralow Ttc (0.07%) of real-time d33 is also achieved in this work. The structural heterogeneity yields the high piezoresponse, and the built-in field resulting from layer-type ceramic composites provides the driving force to promote the diffused ferroelectric–relaxor phase transition and the resultant ferroelectric order with high Td. The above synergistic contributions realize the remission of the d33–Td–Ttc conflict in a sandwich-structural SWS-6/11/6BT-40% ceramic composite. Thus, our work provided a path for designing the BNT-based piezoceramics with potential for industrial applications.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2023
·
IF 10.9
Yaqing Ma,Linjing Liu,Hang Xie,Zerui Zhang,Qiangwei Kou,Rui Lv,Bin Yang,Yunfei Chang,Fei Li
Enhanced piezoelectric response was usually achieved in (Bi 0.5 Na 0.5 )TiO 3 (BNT)-based ceramics with sacrifice of depolarization temperature T d , seriously limiting their usage range in electromechanical applications. In this work, we propose to explore piezoelectric anisotropy and domain engineering in composition & microstructure-controlled textured ceramics to resolve this issue. [001] c -textured 0.94(Bi 0.5 Na 0.5 )TiO 3 –0.06BaTiO 3 (0.94BNT-0.06BT) ceramics with Lotgering factor F 001 ∼91% were fabricated through homoepitaxial templated grain growth (TGG) via using 0.94BNT-0.06BT microplatelet templates. The textured samples exhibited more ordered domains with facilitated domain switching behavior, being consistent with saturated high polarization achieved at lower electric fields. Increasing F 001 to above 60% enables rapid enhancement of piezoelectric response. Notably, compared to non-textured counterpart, the maximally textured ceramics exhibited ∼236% enhanced piezoelectric coefficient ( d 33 ∼302 pC/N) and ∼280% enhanced piezoelectric voltage coefficient ( g 33 ∼49.8 × 10 −3 Vm/N), together with slightly increased depolarization temperature ( T d ∼106 °C). Moreover, those values are approaching or even higher than the single-crystal values. This work not only provides important guidelines for design and synthesis of novel textured ceramics with improved comprehensive electrical properties, but also can expand application fields of BNT-based ceramics.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2022
·Vol. 106
·期 3
·1921-1931
·
IF 4.186
Jun Chen,Changrong Zhou,Kelin Chen,Qingning Li,Changlai Yuan,Jiwen Xu,Shuai Cheng,Jingtai Zhao,Guanghui Rao
One of the inherent disadvantages of Bi 0.5 Na 0.5 TiO 3 -based (BNT-based) piezoceramics is that an increment of the depolarization temperature ( T d ) is generally accompanied by a deterioration of the temperature stability of the real-time piezoelectric constant ( d 33 ), which severely restricts the practical applications of the materials. Herein, we propose a new strategy to mitigate the conflict between the elevation of T d and the temperature stability of the real-time d 33 in BNT-based ceramics via integrating the pressure-assisted sintering and quenching process. By this strategy, we not only increased the T d from 109 to 166°C but also improved the temperature stability of the real-time d 33 (the temperature coefficient T tc = ± 13 pC/N) in 0.94Bi 0.5 Na 0.5 TiO 3 –0.06BaTiO 3 ceramic. Both the built-in field and the increment of the field-induced R 3 c phase fraction play the significant role in enhancing the T d and the temperature stability of the real-time d 33 . Thus, our work provides a simple and effective approach for designing piezoceramics with high T d and a superior temperature stability of the real-time d 33 .
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
ACTA MATERIALIA
·
2025
·
IF 9.3
Lin Tang,Jingzhi Li,Xuefan Zhou,Muhammad Habib,Yan Zhang,Xi Yuan,Dou Zhang
The real-time temperature-dependent piezoelectric coefficient d 33 suggests a significantly increased piezo-response below 350 °C and a wide depolarization temperature ( T d ) range of 350-525 °C for the 75BiFeO 3 -25BaTiO 3 (75BF-25BT) ceramics. By the in-situ XRD, Raman, and TEM characterization, a phase evolution from R 3 c to R 3 m and obvious domain refinement were found to occur in the temperature range of 200-300 °C. The R 3 m / P 4 mm phase coexistence associated with the thermally assisted domain motions was considered to be the main reason for the significant enhancement of d 33 below 350 °C. Furthermore, the migration of oxygen vacancies is the dominant contribution to the reduction in electrical resistivity as the temperature exceeds 350 °C, leading to a large increase in the dielectric loss. The high-temperature phase transitions, the gradual decrease in rhombohedral/tetragonal lattice distortion, and the increased leakage conduction are likely the causes of depolarization in the 75BF-25BT ceramics.
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS & DESIGN
·
2017
·
IF 4.364
Jie Zhang,Zhenxing Yue,Yu Luo,Xiaohua Zhang,Longtu Li
Relaxation phenomena in dielectrics are well known to be closely related to their defect chemistry. However, the relaxation behavior of microwave dielectrics has seldom been considered, despite these materials being an important member of the electroceramic family. Here, the relaxation behavior of the typical microwave dielectric ceramic barium tetratitanate (BaTi 4 O 9 ) was investigated. Significant thermally stimulated relaxation was observed in both dielectric spectroscopy and thermally stimulated depolarization current (TSDC) measurements, and the correlation between relaxation and defect behavior was addressed. TSDC characterization revealed that defect dipoles [(Ti Ti ' )−(V O •• )] with activation energies ( E a ) of 0.32–0.36 eV appeared at low temperature, while in-grain and across-grain boundary oxygen vacancies (V O •• ) appeared at higher temperature, yielding E a of 0.30–0.48 eV and 0.65–1.01 eV, respectively. It was further believed that these two types of defects, (Ti Ti ' )−(V O •• ) and V O •• , were correspondingly responsible for the dielectric relaxation observed at low and high temperature. The relaxation behavior of several typical Ti-containing microwave dielectrics, such as BaTi 4 O 9 , TiO 2 , MgTiO 3 and Ca 0.8 Sr 0.2 TiO 3 , was compared, which suggests that microwave dielectric performance and defect behavior are closely related to the connections of TiO 6 octahedra in the materials.
研究领域:
材料科学
·
电介质物理
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2023
·
IF 5.4
Huihui Liu,Changrong Zhou,Jun Chen,Changlai Yuan,Shuai Cheng,Jiwen Xu,Qingning Li,Guohua Chen,Guanghui Rao
For (Bi 0.5 Na 0.5 )TiO 3 -based ceramics, one of the obstacles limiting their actual application is the incompatibility of a large piezoelectric response d 33 with a low depolarization temperature T d . In this work, a high d 33 of 186 pC/N and a T d of 133 °C are achieved simultaneously in unmodified 0.93(Bi 0.5 Na 0.5 ) TiO 3 –0.07BaTiO 3 (BNT-7BT) ceramics only via optimizing sintering temperature. Structural and microstructural analyses show that grain size and relative content of P4bm and R3c phases in BNT-7BT ceramics can be regulated by tuning the sintering temperature ( T sinter = 1100 ° C, 1120 ° C, 1140 ° C, 1160 ° C, and 1180 ° C). Thus, high sintering temperature is not only able to increase the grain size to promote the domains switching for higher the piezoelectric response, but also to enhance the ratio of R3c/P4bm phase so as to improve ferroelectric-relaxor transition temperature that defer the depolarization. Hence, the present work provides a simple and effective method for optimizing the piezoelectric properties of (Bi 0.5 Na 0.5 )TiO 3 -based ceramics.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
Open Life Sciences
·
2016
·Vol. 11
·期 1
·542-551
·
IF 0
Huanan Wang,Ming Yao,Wenqing Xu
Cancer is the second leading cause of death worldwide. Traditional antitumor drugs exhibit severe cytotoxic and side effects. Lung cancer needs new and more effective treatment approaches. Coumarin derivatives can act on various tumor cells and show anti-proliferative activity through various mechanisms, including mitochondrial signaling cascades that regulate development and apoptosis of cells. Mitochondria-targeted coumarin derivatives have not been reported yet. Taking advantage of the fact that cancer cells frequently have higher mitochondria membrane potential, we synthesized a mitochondria-targeted 6-(nicotinamide) methyl coumarin by coupling 6-methyl coumarin to nicotinamide. Our results demonstrate that 6-(nicotinamide) methyl coumarin preferentially kills A549 cells through inducing A549 cells apoptosis, mediated by increasing ROS level and causing mitochondrial depolarization. Strikingly, the viability of the A31 cells treated with 6-(nicotinamide) methyl coumarin did not decrease, indicating that 6-(nicotinamide) methyl coumarin preferentially accumulates in A549 cells and A549 cells are much more susceptible to 6-(nicotinamide) methyl coumarin treatment compared with A31 cells.
研究领域:
肿瘤学
·
药理学
·
细胞生物学
✓ 已验证
产品关联
DOI
危险品化学品经营许可证（带存储）