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High-frequency wide beam underwater transducer based on 1–3 piezocomposite 基于1-3压电复合材料的高频宽波束水下传感器
IF 0.4 4区 物理与天体物理 Q4 PHYSICS, CONDENSED MATTER Pub Date : 2021-11-01 DOI: 10.1080/07315171.2021.1971009
Chao Zhong, Junan Xu, Shaohua Hao, Yanjun Zhang, Likun Wang, L. Qin
Abstract In order to increase the beam width of high-frequency underwater transducer, ellipsoidal cap and spherical cap transducer based on 1–3 piezocomposite were designed and fabricated. Finite element simulation was used to analyze transmitting voltage response level and beam directivity curve of the transducer. The transducer was fabricated by the curved 1–3 piezoelectric composite. Compared with spherical cap transducer, the elliptical spherical cap transducer has the advantage of wide beam opening angle and relatively smooth directivity curve. Both simulation and experiment results showed the potential of a broad covered area of the composite transducer in underwater environment.
摘要为了提高高频水下换能器的波束宽度,设计制作了基于1-3压电复合材料的椭球帽和球帽换能器。采用有限元仿真分析了换能器的发射电压响应水平和波束方向性曲线。该换能器由弯曲1-3压电复合材料制成。与球帽换能器相比,椭圆球帽换能器具有开束角宽、指向性曲线相对光滑的优点。仿真和实验结果表明,复合换能器在水下环境中具有较大的覆盖面积。
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引用次数: 2
Optimized testing of package for stacked piezoelectric energy harvester in roadway applications 道路应用中堆叠式压电能量采集器封装优化测试
IF 0.4 4区 物理与天体物理 Q4 PHYSICS, CONDENSED MATTER Pub Date : 2021-11-01 DOI: 10.1080/07315171.2021.1971010
Peng Wang, Run Cheng, G. Ding, Jun Wang, Zhiming Liu, Haotong Zhang
Abstract Piezoelectric energy harvester (PEH) applied in collection and conversion of mechanical energy on roadway has attracted widely attentions in recent years. This study aims to improve a new type of road-compatible stacked PEH (sPEH), which consists of six PZT stacked piezoelectric transducers connected in parallel and a matched package to better the output efficiency and working life of sPEH. Uniaxial compression tests are conducted to measure the output power, voltage and current of the sPEH. The package of the sPEH is optimized depending on the sensitivity of the output to loading amplitude, frequency, package material and cover thicknesses. Tests results show that the output of the sPEH increases as increasing load amplitude and frequency. The sPEH with a package being polyethylene and 3 mm thick exhibited up to maximum output of 21.97 mA power and 8.59 W/m2 power density which successfully charges a lithium battery in 24 h. Finally, the protection of package against the erosion of environment and crushing of traffic load in road application was verified by immersion and compression test.
压电能量采集器(PEH)用于巷道机械能量的收集和转换,近年来受到了广泛关注。本研究旨在改进一种新型道路兼容堆叠式压电换能器(sPEH),该换能器由6个PZT堆叠式压电换能器并联连接和匹配封装组成,以提高sPEH的输出效率和工作寿命。进行了单轴压缩试验,测量了sPEH的输出功率、电压和电流。sPEH的封装根据输出对加载幅度、频率、封装材料和覆盖厚度的灵敏度进行了优化。试验结果表明,随着负载幅值和频率的增加,sPEH的输出增大。封装为聚乙烯,厚度为3毫米的sPEH最大输出功率为21.97 mA,功率密度为8.59 W/m2,可在24小时内成功为锂电池充电。最后,通过浸没和压缩试验,验证了复合材料在道路应用中对环境侵蚀和交通荷载破碎的保护作用。
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引用次数: 5
Monte Carlo simulation for predicting neutron-induced single-event upset in ferroelectric random access memory 预测铁电随机存取存储器中中子引起的单事件扰动的蒙特卡罗模拟
IF 0.4 4区 物理与天体物理 Q4 PHYSICS, CONDENSED MATTER Pub Date : 2021-11-01 DOI: 10.1080/07315171.2021.1971011
Hong Zhang, Jing Huang, H. Guo, Z. Lei, B. Li
Abstract The influence of the single event effects (SEE) induced by neutron up to 14 MeV on ferroelectric random access memory (FRAM) is simulated by the Monte Carlo method. Simulation results show that single-event upset (SEU) occurs in FRAM when the neutron energy is greater than 6 MeV, and the average energy deposition of neutrons in the sensitive volume increases with increasing neutron energy. Neutron SEU in FRAM occurs when the energy deposition of a single secondary particles generated by a nuclear reaction in the sensitive region exceeds the critical energy. The neutron SEU cross-section of FRAM increases exponentially with increasing energy in the range of 6–14 MeV, and the SEU cross-section is about 1.39 × 10−14 cm2 at 14 MeV. These findings are due to concomitant increases in the variety and numbers of secondary particles whose energy deposition in the sensitive region exceeds the critical energy.
摘要采用蒙特卡罗方法模拟了高达14 MeV的中子诱导的单事件效应对铁电随机存取存储器(FRAM)的影响。仿真结果表明,当中子能量大于6 MeV时,FRAM中会发生单事件扰动(SEU),并且随着中子能量的增加,敏感体中中子的平均能量沉积增加。当敏感区核反应产生的单个二次粒子的能量沉积超过临界能量时,FRAM中的中子SEU就会发生。在6 ~ 14 MeV范围内,FRAM的中子SEU截面随能量的增加呈指数增长,在14 MeV时的SEU截面约为1.39 × 10−14 cm2。这些发现是由于伴随增加的二次粒子的种类和数量,其能量沉积在敏感区超过临界能量。
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引用次数: 0
Investigation on microscopic mechanisms of high-Curie temperature PMN-PH-PT piezoelectric ceramics 高居里温度PMN-PH-PT压电陶瓷微观机理研究
IF 0.4 4区 物理与天体物理 Q4 PHYSICS, CONDENSED MATTER Pub Date : 2021-11-01 DOI: 10.1080/07315171.2021.1971008
Rongfeng Zhu, B. Fang, Xiang-juan Zhao, Shuai Zhang, Xiaolong Lu, Jianning Ding
Abstract High-Curie temperature (TC) piezoelectric ceramics 0.15Pb(Mg1/3Nb2/3)O3-0.38PbHfO3-0.47PbTiO3 (0.15PMN-0.38PH-0.47PT) were fabricated via the citrate method, which shows pure perovskite structure. The ceramics have composition locating at the rhombohedral side around the morphotropic phase boundary (MPB), and present enhanced electrical properties as compared with those prepared by the solid-state reaction method via the columbite precursor technique. Temperature-dependent Raman spectroscopy not only proves the occurrence of the ferroelectric to paraelectric phase transition around TC, but also detects the successive phase symmetry transitions, which correlate with the polar nanoregions (PNRs) or the coexistence of multiple ferroelectric phases. Large quantities of fine stripe nanoscale ferroelectric domains are observed by piezoresponse force microscopy (PFM) in the 0.15PMN-0.38PH-0.47PT ceramics, which form the larger micron island domains. Temperature-dependent Raman spectra and PFM results indicate that the excellent dielectric, ferroelectric and piezoelectric properties of the 0.15PMN-0.38PH-0.47PT ceramics can be attributed to either the existence of the PNRs with low symmetry or the multiple-ferroelectric-phases coexistence around room temperature and the fine stripe ferroelectric domains.
采用柠檬酸盐法制备了具有纯钙钛矿结构的高居里温度压电陶瓷0.15Pb(Mg1/3Nb2/3) o3 -0.38 phbhfo3 -0.47 pbtio3 (0.15PMN-0.38PH-0.47PT)。该陶瓷的成分位于偏向形态相边界(MPB)周围的菱形面侧,与采用柱状前驱体技术的固相反应法制备的陶瓷相比,其电学性能有所提高。温度相关拉曼光谱不仅证明了TC周围铁电相向准电相转变的发生,而且还检测到与极性纳米区(PNRs)或多个铁电相共存相关的连续相对称转变。利用压电响应力显微镜(PFM)在0.15PMN-0.38PH-0.47PT陶瓷中观察到大量细条纹纳米铁电畴,形成较大的微米岛状畴。温度相关的拉曼光谱和PFM结果表明,0.15PMN-0.38PH-0.47PT陶瓷优异的介电、铁电和压电性能可归因于低对称性pnr的存在或室温和细条纹铁电畴周围的多铁电相共存。
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引用次数: 1
Exchange bias and vertical shift of the magnetic hysteresis loop in Co/BiFeO3 bilayers Co/BiFeO3双层中磁滞回线的交换偏置和垂直位移
IF 0.4 4区 物理与天体物理 Q4 PHYSICS, CONDENSED MATTER Pub Date : 2021-11-01 DOI: 10.1080/07315171.2021.1971006
Liyan Wang, Changzheng Wang
Abstract To reveal the mechanism of interfacial exchange coupling, the magnetic hysteresis (M-H) loop of Co/BiFeO3 bilayers deposited on (001) LaAlO3 (LAO) substrates by magnetron sputtering was measured. The M-H loop displays a horizontal shift along the field axis coexisting with a vertical shift along the magnetization axis. The frozen uncompensated interfacial spins result in the EB effect, as demonstrated by the similar dependencies between EB and the vertical shift in temperature and BFO thickness. In addition, the M-H loop also shows an enhancement in magnetization, which is considered to result from the induced net moments at the interface.
摘要为了揭示界面交换耦合的机理,采用磁控溅射法测量了(001)LaAlO3 (LAO)衬底上沉积的Co/BiFeO3双分子层的磁滞回线(M-H)。M-H环沿磁场轴呈现水平位移,同时沿磁化轴呈现垂直位移。冻结的未补偿界面自旋导致EB效应,EB与温度和BFO厚度的垂直位移之间存在相似的依赖关系。此外,M-H环也表现出磁化强度的增强,这被认为是由于界面处的诱导净矩所致。
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引用次数: 0
Critical magnetic behavior of the half Heusler alloy RhCrSi: Monte Carlo study 半Heusler合金RhCrSi的临界磁性行为:蒙特卡罗研究
IF 0.4 4区 物理与天体物理 Q4 PHYSICS, CONDENSED MATTER Pub Date : 2021-08-11 DOI: 10.1080/07315171.2022.2076468
S. Idrissi, S. Ziti, H. Labrim, L. Bahmad
Abstract In this paper, we study the critical magnetic properties of the Half Heusler alloy RhCrSi, using Monte Carlo simulations (MCS) under the Metropolis algorithm. In fact, to study this alloy, we apply an Ising model using the MCS simulations, we concentrate only on the magnetic atoms: Rh and Cr. For this purpose, these magnetic atoms are modeled by the spin moments S = 5/2 for Rh atoms and σ = 2 for Cr atoms, respectively. In addition, we discuss the ground state phase diagrams in different planes corresponding to different physical parameters. On the other hand, for non-null temperature values, we perform the Monte Carlo simulations (MCS) to study the critical behavior of the compound RhCrSi, in the Ising approximation. Indeed, we present a detailed discussion of the obtained results for the magnetizations as a function of the temperature, the crystal field and the exchange coupling interactions. Additionally, we give the reliance of the basic temperature as an element of precious crystal field when fixing the exchange coupling interactions. To finish this work, we built up and examined the magnetic hysteresis cycles and the relating coercive fields as a part of the external magnetic field.
摘要本文采用蒙特卡罗模拟(Monte Carlo simulation, MCS)方法,在Metropolis算法下研究了半Heusler合金RhCrSi的临界磁性能。事实上,为了研究这种合金,我们使用了一个Ising模型来使用MCS模拟,我们只关注磁性原子:Rh和Cr。为此,这些磁性原子分别由Rh原子的自旋矩S = 5/2和Cr原子的自旋矩σ = 2来建模。此外,我们还讨论了不同物理参数对应的不同平面的基态相图。另一方面,对于非零温值,我们执行蒙特卡罗模拟(MCS)来研究化合物RhCrSi在Ising近似下的临界行为。实际上,我们详细讨论了所得的磁化强度与温度、晶体场和交换耦合相互作用的关系。此外,在确定交换耦合相互作用时,我们给出了基本温度作为宝贵晶体场的一个因素的依赖关系。为了完成这项工作,我们建立并检测了磁滞循环和相关的矫顽力场作为外磁场的一部分。
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引用次数: 2
Effect of alternative mechanochemical method on modified bismuth titanate 机械化学替代法对改性钛酸铋的影响
IF 0.4 4区 物理与天体物理 Q4 PHYSICS, CONDENSED MATTER Pub Date : 2021-06-01 DOI: 10.1080/07315171.2021.1923118
Nagbasavanna Sharanappa, A. Bidve
Abstract Bi4 – x La x Ti3O12 (BiLT, x = 0.60–1.00) ceramics have been successfully synthesized by the alternative mechanochemical method and investigated their structural, microstructure, dielectric, and ferroelectric properties. Based on thermal stability of synthesized samples, compounds were calcined at 750 °C. No secondary phase is observed in the powder X-ray diffraction patterns. Plate-like shape with enhanced density is seen in the scanning electron microscope micrographs. EDAX pattern confirmed the chemical composition of samples. Prepared ceramic sample had relatively appreciable remanent polarization value (≈14.5 µC/cm2) at room temperature. Microstructure significantly influenced the dielectric and ferroelectric properties of the modified BiT ceramics. Synthesized compounds explored desirable electronic properties for innovative ferroelectric-based device applications.
摘要采用机械化学替代法成功合成了Bi4 - x La x Ti3O12 (BiLT, x = 0.60-1.00)陶瓷,并对其结构、微观结构、介电性能和铁电性能进行了研究。根据合成样品的热稳定性,将化合物在750℃下煅烧。在粉末x射线衍射图中未观察到二次相。扫描电镜下可见密度增强的片状。EDAX模式证实了样品的化学成分。制备的陶瓷样品在室温下具有相当可观的剩余极化值(≈14.5µC/cm2)。微观结构对改性BiT陶瓷的介电性能和铁电性能有显著影响。合成的化合物为创新的铁电基器件应用探索了理想的电子特性。
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引用次数: 0
On the Capacitance of Piezoelectric Metal–Insulator–Semiconductor Junctions 压电金属-绝缘体-半导体结的电容研究
IF 0.4 4区 物理与天体物理 Q4 PHYSICS, CONDENSED MATTER Pub Date : 2021-04-30 DOI: 10.1080/07315171.2021.1923115
Lei Yang, Jianke Du, Ji Wang, Jia-shi Yang
Abstract We study the capacitance of piezoelectric metal–insulator–semiconductor junctions. The linearized macroscopic theories of piezoelectric dielectrics and semiconductors are used. An analytical solution is obtained with an explicit expression for the junction capacitance. The contribution from the semiconductor part is characterized by the Debye length. When the semiconductor part is long compared to the Debye length, the junction capacitance can be written as a serial connection of two capacitors of the insulator and semiconductor parts. Because of piezoelectric coupling, a charge-stress coefficient is introduced to describe the junction behavior completely.
摘要研究了压电金属-绝缘体-半导体结的电容。使用压电介质和半导体的线性化宏观理论。得到了结电容的解析解和显式表达式。半导体部分的贡献由德拜长度表征。当半导体部分比德拜长度长时,结电容可以写成绝缘体和半导体部分的两个电容的串联。由于压电耦合的存在,引入了电荷-应力系数来全面描述结的特性。
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引用次数: 0
Low temperature investigation on dielectric properties of carbon doped copper oxide 掺杂碳氧化铜介电性能的低温研究
IF 0.4 4区 物理与天体物理 Q4 PHYSICS, CONDENSED MATTER Pub Date : 2021-04-30 DOI: 10.1080/07315171.2021.1923120
Hema Chandra Rao Bitra, A. Rao, K. S. Babu, G. N. Rao
Abstract Carbon-doped copper oxide (CuO)1 -x C x (x = 0, 0.05 and 0.1) samples were synthesized by solid state reaction method, and sintered at 850 °C for 12 h. An X-ray diffraction (XRD) result shows that the structure of the samples was monoclinic. Dielectric studies were carried for these samples in the temperature range 80 K − 300 K between the frequency range 20 Hz − 1 MHz via impedance analyzer. The permittivity and tangent loss values of the doped samples increase with increasing doping concentration. In AC conductivity study, the conductivity mechanism of the 0% and 10% carbon doped samples follows correlated barrier hopping (CBH) model and 5% carbon doped sample follows quantum mechanical tunnelling (QMT) model. The temperature-dependent conductivity curve seems to obey the Arrhenius behavior. The activation energy values have been calculated from the frequency-dependent conductivity curves. The cole–cole plot shows the formation of grain and grain boundary in the samples.
摘要:采用固相反应法合成了掺杂碳的氧化铜(CuO)1 -x C x (x = 0、0.05和0.1)样品,并在850℃下烧结12 h。x射线衍射(XRD)结果表明,样品呈单斜晶型结构。在温度为80k ~ 300k,频率为20hz ~ 1mhz的范围内,通过阻抗分析仪对样品进行介电特性研究。掺杂样品的介电常数和正切损耗值随掺杂浓度的增加而增加。在交流电导率研究中,0%和10%掺杂碳样品的电导率机制遵循相关势垒跳变(CBH)模型,5%掺杂碳样品的电导率机制遵循量子力学隧穿(QMT)模型。随温度变化的电导率曲线似乎服从Arrhenius行为。根据频率相关的电导率曲线计算了活化能值。cole-cole图显示了样品中晶粒和晶界的形成。
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引用次数: 1
Influence of moisture on ferroelectric–paraelectric phase transition of a composite containing oxidized MWCNT and TGS 水分对氧化MWCNT和TGS复合材料铁电-准电相变的影响
IF 0.4 4区 物理与天体物理 Q4 PHYSICS, CONDENSED MATTER Pub Date : 2021-04-30 DOI: 10.1080/07315171.2021.1923116
H. Nguyen, Phan Thi Hong Thao
Abstract This work reports experimental results for investigating the effects of residual water on phase transition in triglycine sulfate (TGS) filled with 5 wt% of oxidized multiwalled carbon nanotubes (OMWCNTs) under a relative humidity of 90% for different storage time. A similar composite containing TGS and non-oxidized MWCNT was also synthesized for comparison. According to measured data, the moisture was well adsorbed into OMWCNT/TGS composite and resulted in the shift of phase transition point toward higher temperatures for samples stored for less than 5 days. The longer storage caused a significant drop of dielectric constant at phase transition.
摘要:本文报道了在相对湿度为90%的条件下,在不同储存时间内,残余水对含有5%氧化多壁碳纳米管(OMWCNTs)的硫酸甘油三酯(TGS)的相变影响的实验结果。还合成了含有TGS和未氧化MWCNT的类似复合材料进行比较。根据测量数据,在储存时间小于5天的样品中,水分被很好地吸附到OMWCNT/TGS复合材料中,导致相变点向更高的温度移动。较长的储存时间导致相变时介电常数显著下降。
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引用次数: 6
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Ferroelectrics Letters Section
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