JOURNAL OF APPLIED PHYSICS
·
2016
·Vol. 119
·期 12
·
IF 2.101
Wei T.,Dong Z.,Zhao C. Z.,Guo Y. Y.,Zhou Q. J.,Li Z. P.
New unfilled tetragonal tungsten bronze (TTB) oxides, Ba 5−5x Sm 5x Ti 5x Nb 10−5x O 30 (BSTN-x), where 0.10 ≤ x ≤ 0.35, have been synthesized in this work. Their crystal structure was determined and analyzed based on Rietveld structural refinement. It is found that single TTB phase can be formed in a particular x range (i.e., 0.15 ≤ x ≤ 0.3) due to the competition interaction between tolerance factor and electronegativity difference. Furthermore, dielectric and ferroelectric results indicate that phase transitions and ferroelectric states are sensitive to x. Referring to the local chemistry, we suggest that the raise of vacancies at the A 2 -site compared with that of A 1 -site will intensely depress the normal ferroelectric phase and is in favor of relaxor ferroelectric state. Macroscopically, previous A-site size difference standpoint on fill TTB compounds cannot give a reasonable explanation about the variation of dielectric maximum temperature (T m ) for present BSTN-x compounds. Alternatively, tetragonality (c/a) is adopted which can well describe the variation of T m in whole x range. In addition, one by one correspondence between tetragonality and electrical features can be found, and the compositions involving high c/a are usually stabilized in normal ferroelectric phase. It is believed that c/a is a more appropriate parameter to illustrate the variation of ferroelectric properties for unfilled TTB system.
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 Physical Chemistry C
·
2023
·
IF 3.7
Miao Miao Zhao,Lei Meng,Yi Yang Xu,Na Du,Fei Yen
While all of the polymorphs of NH4I and NH4Br are nonpolar, a reversible electric polarization is established in the ordered γ phases of (NH4)0.73(ND4)0.27I and (NH4)0.84(ND4)0.16Br (where D is 2H) via dc electric fields. The presence of two groups of orbital magnetic moments appears to be responsible for the asymmetric lattice distortions. Our findings provide an alternative pathway for hydrogen-based materials to potentially add a ferroelectric functionality.
研究领域:
材料科学
·
物理学
✓ 已验证
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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
✓ 已验证
DOI
高影响因子
MATERIALS SCIENCE FORUM
·
2015
·
IF 0
Wei Cai,Chun Lin Fu,Rong Li Gao,Wei Hai Jiang,Xiao Ling Deng,Gang Chen
Bismuth ferrite is an important material in ferroelectric photovoltaic field, because of its narrow band gap and large polarization. Doping is a common method to further improve the photovoltaic properties of bismuth ferrite. Mn-doped bismuth ferrite thin films were prepared by sol-gel method. The effects of manganese on the crystal structure, ferroelectric and photovoltaic properties have been investigated. The result indicates that Mn-doped bismuth ferrite thin films are single phase and the lattice constant increases with the increase of manganese content. As manganese content increases, the remnant polarization and coercive electric field increase, while the short circuit photocurrent density and power conversion efficiency decrease. The open circuit photovoltage increases first and reaches the maximum and then decreases as manganese content increases. The results indicate that enhanced ferroelectricity caused by addition of manganese doesn’t make improvement on the photovoltaic characteristic.
研究领域:
材料科学
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物理学
✓ 已验证
DOI
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 31
·期 1
·677-683
·
IF 2.195
Wang Jing,Shen Bowen,Zhu Kongjun,Qiu Jinhao
With the ever increasing requirements for the structural health monitoring systems, the deposition of the piezoelectric films on the metallic or structural materials has turned out to be an important issue. Pb(Mg, Nb)O 3 -PbTiO 3 films with different buffer layers, i.e., in situ NiO, pre-fabricated NiO and LaNiO 3 , were successfully deposited on the Ni foil via the chemical solution deposition. The crystal structures and electric performances showed evident dependence on the buffer layer. Pre-deposited NiO and LaNiO 3 efficiently prevented the diffusion and complex reactions occurring at the interface, offered abundant nucleation sites, and thus helped the formation of pure high-qualified perovskite PMN-PT films at higher annealing temperatures.
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
·
2022
·Vol. 33
·期 21
·17258-17271
·
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
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 12
·9352-9365
·
IF 2.22
Li Cai-Xia,Yang Bin,Zhang Shan-Tao,Hong Yue-Nan,Liu Dan-Qing,Zhang Rui,Shuo Gu,Cao Wen-Wu
Lead-free Ba 0.70 Ca 0.30 TiO 3 + x mol% MnO 2 (abbreviated as BCTM x , x = 0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 1.0 and 1.2) piezoelectric ceramics were synthesized by the solid-state reaction method. The effects of MnO 2 additives on the phase transition, microstructure, dielectric, ferroelectric, strain behaviors and piezoelectric properties are investigated. BCTM x ceramics ( x = 0–1.2) exhibit diphasic tetragonal and orthorhombic phases. The tetragonal phase is gradually suppressed by increasing x . As x increases from 0 to 1.2, the Curie temperature ( T C ) decreases monotonically from 128 to 45 °C, while the grain size, dielectric and ferroelectric properties increase and reach the maximum near x = 0.6. On the other hand, the piezoelectric coefficient ( d 33 ) and the electromechanical coupling coefficient ( k p %) decrease simultaneously, whereas the mechanical quality factor ( Q m ), bipolar and unipolar strain increase and reach the maximum values of 684, 0.28% and 0.24%, respectively, near x = 0.6. The optimum electrical performance with \(\varepsilon_{r}\) = 1323, tan \(\delta\) = 0.08, T C = 66 °C, P max = 12.2 μC/cm 2 , P r = 6.9 μC/cm 2 , E C = 13.3 kV/cm, d 33 = 116 pC/N, k p % = 0.22%, Q m = 684 and the normalized strain \(d_{33}^{*}\) = S max / E max as high as 480 pm/V were observed for x = 0.6. The high strain and Q m suggested that the MnO 2 -modified Ba 0.70 Ca 0.30 TiO 3 ceramics are promising candidate for high power applications.
研究领域:
材料科学
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物理学
✓ 已验证
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2022
·
IF 4.632
Zhixiong Song,Jizhen Liu,Liyan Xue,Zhengming Jiang,Fan Yang
In this work, neodymium (Nd) and samarium (Sm) codoped lead lanthanum zirconate titanate (PLZT) ceramics were prepared by a high-temperature solid-state method. The samples were characterized by X-ray diffraction, scanning electron microscopy and ferroelectric analysis. Rare earth-doped PLZT ceramics show good phase formation. An appropriate rare earth element doping amount increases the densities of PLZT ceramics and reduces their resistivities, which is due to the role of rare earth elements in grain refinement. However, the increase in the amount of grain boundaries caused by grain refinement also affects domain inversion. Therefore, with increasing doping concentration, the remnant polarization of PLZT gradually decreases, and the doping of rare earth elements also slightly reduces the band gap of PLZT. Under irradiation with an X-ray simulated beta source with a particle energy of 10 keV (between the average energies of the beta particles of 3 H and 63 Ni), the ceramic sheets in this work produce current densities of up to 1.38 nA/cm 2 . This indicates that Nd and Sm codoped PLZT ceramics have a certain potential for application in betavoltaic batteries .
研究领域:
材料科学
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核能工程
✓ 已验证
产品关联
DOI
高影响因子
npj Flexible Electronics
·
2025
·Vol. 9
·期 1
·1-10
·
IF 15.5
Pang Jinglin,Duan Tianpeng,Liao Min,Jiang Limei,Zhou Yichun,Yang Qiong,Liao Jiajia,Jiang Jie
As the core component of ferroelectric memories, HfO 2 -based ferroelectric thin films play a crucial role in achieving their excellent storage performance. Here, we improved the ferroelectric properties and domain switching properties through in situ stress loading during annealing. The thin films are annealed under different bending states by applying different stress actions, and it is observed that, within a certain range of stress bending, the optimization of the ferroelectric properties of the annealed thin films can reach an extreme value. Specifically, under the influence of a small electric field, the 2 P r values of thin films annealed at +10 and −10 mm increased by 87.1% and 71.1%, respectively, compared with the unbent films. Additionally, these thin films exhibit extremely high domain wall mobility and excellent domain switching capabilities. Once the ferroelectric phase is formed through in situ stress modulation, it remains stable even under multiple service environments.
研究领域:
材料科学
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电子工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
·
IF 3.014
Huajun Sun,Saihong Duan,Xiaofang Liu,Dawei Wang,Huiting Sui
Lead-free Ba 0.98 Ca 0.02 Zr 0.02 Ti 0.98 O 3 -xmol% MnO 2 (BCZT-xMn) (x = 0.1, 0.2, 0.3, 0.4, 0.5) ceramics were prepared by conventional solid-state reaction method and the effects of MnO 2 doping content and sintering temperature on microstructure and electrical properties of BCZT ceramics were studied. The ceramics samples with all MnO 2 doping contents exhibit pure perovskite structure and similar Curie temperature of approximately 120 °C. Among all, the sample with 0.3 mol. % MnO 2 doping content sintered at 1400 °C exhibits improved ferroelectricity with a relatively high remnant polarization ( P r ) and low coercive electric field ( E c ) of 15.7 μC/cm 2 and 180 V/mm, respectively, which can be attributed to the fact that an appropriate doping content of MnO 2 does favor to the grain growth, with the favorable effect on domain motion. Accordingly, excellent piezoelectric property with piezoelectric coefficient ( d 33 ) of 308 pC/N can be obtained. Besides, the sample shows a relatively low dielectric loss (tanδ) of 1.04%. As a result, the BCZT-xMn ceramic exhibits the potential to be used in memory and transformer applications.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2024
·
IF 1.8
Juan Liu,Yu Sun,Lilin Xiang,TuLai Sun,Zilong Yu,Bing Cui,Chuangui Jin
In the present study, SrTiO 3 was selected to enhance the multiferroic characteristics of Bi 0.88 Sm 0.12 FeO 3 (BSF) ceramics. With increasing SrTiO 3 content, the principal phase of BSF ceramic transitions from rhombohedral R3c to Pna2 1 . Through DSC and dielectric analysis, it was observed that both the Curie temperature and Néel temperature decreased proportionally with the augmentation of SrTiO 3 content. When x = .1, the optimal ferroelectric performance is achieved, and the highest remanent polarization value is 55.47 µC/cm 2 , significantly surpassing that of BSF ceramics. Moreover, the PFM test results showed that as the substitution content increased, the domains in the BSF ceramic gradually transformed from normal ferroelectric domains to polar nanomicro-domains. Magnetic and magnetoelectric results show that when x = .1, the best magnetic properties are obtained, M r = 59.7 emu/mol. The magnetoelectric coefficient α ME initially increased and then decreased with the increasing SrTiO 3 content, reaching its optimum magnetoelectric properties at x = .1, where α ME = .47 mV cm –1 Oe –1 . In summary, when the substitution amount of SrTiO 3 reaches 10%, the ferroelectric, magnetic, and magnetoelectric properties of BSF ceramics are significantly improved.
研究领域:
材料科学
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物理学
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2019
·Vol. 137
·期 6
·48345
·
IF 2.188
Libo Wang,Yuchang Su,Jing Zhang,Hongzhi Zhang,Qiaoqiao Dong
PVDF-CoFe 2 O 4 (CFO) thick membranes were synthesized by solvent casting method. The mixed organic solvents consist of N-methyl-2-pyrrolidone (NMP) and Ethyl acetate (EA), in which the mass ratios of NMP and EA (NMP:EA = 1:0, 1:1, and 1:2) and the temperature of solvent evaporation (range from 50 to 80 °C) has been considered. The phase structure, β-PVDF phase content, and electrical and magnetic properties of these membranes were investigated to reveal the effect of EA addition and temperature on these properties. Results manifest that all samples showed coexistence of ferroelectric and ferromagnetic properties at room temperature. EA addition makes film more compact, which may be responsible for the differences in ferromagnetic properties. Adding EA and enhancing temperature resulted in phase transition of PVDF from α and γ to β, which contributed to membranes’ ferroelectric performances. In all samples, NMP:EA = 1:2 treated at 80 °C exhibits the maximum β-phase fraction and polarization (Pmax) of 87.2% and 2.398 μC cm −2 , respectively. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137 , 48345.
研究领域:
材料科学
·
物理学
✓ 已验证
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DOI
高影响因子
危险品化学品经营许可证（带存储）