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Ferroelectric properties of sodium doped cesium nitrate - polymer composite films 掺钠硝酸铯-聚合物复合薄膜的铁电性能
IF 0.4 4区 物理与天体物理 Q4 Materials Science Pub Date : 2017-05-04 DOI: 10.1080/07315171.2017.1320192
A. Nautiyal
ABSTRACT The ferroelectric properties of sodium doped cesium nitrate (Cs1−xNaxNO3) - polymer composite films have been studied. The composite film of Cs1−xNaxNO3: PVA with doping concentration x = 13.6% prepared by spray deposition method at substrate temperature Ts = 200°C shows optimum value of remanent polarization and polarization current. The improved properties have been attributed to high structural distortion.
研究了钠掺杂硝酸铯(Cs1−xNaxNO3) -聚合物复合薄膜的铁电性能。在衬底温度Ts = 200℃下,采用喷雾沉积法制备了掺杂浓度x = 13.6%的Cs1−xNaxNO3: PVA复合薄膜,其残余极化和极化电流均达到了最佳值。性能的改善是由于高结构畸变。
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引用次数: 0
Harvesting thermal energy (via radiation) using pyroelectric materials (PZT-5H): An experimental study 利用热释电材料(PZT-5H)收集热能(通过辐射):一项实验研究
IF 0.4 4区 物理与天体物理 Q4 Materials Science Pub Date : 2017-05-04 DOI: 10.1080/07315171.2017.1320194
M. Vaish, Manish Sharma, R. Vaish, V. Chauhan
ABSTRACT The field of waste thermal energy harvesting has experienced significant growth over the past few years. This paper presents an experimental study on thermal radiation to electrical energy conversion using pyroelectric material (PbZrxTi1-xO3 (PZT-5H)). Pyroelectric material was exposed to UV lamp with a constant frequency of 0.5 Hz and another surface of sample was continuously cooled via natural air fan (for generation continuous temporal gradient in material). Maximum value of stored energy was 1.75 µJ across 100 µF without load resistance. Maximum power output was found to be 0.76 µW across load resistance of 3 MΩ and 10 µF.
在过去的几年里,废热收集领域经历了显著的增长。利用热释电材料PbZrxTi1-xO3 (PZT-5H)进行了热辐射转换电能的实验研究。将热释电材料暴露在0.5 Hz恒定频率的紫外灯下,通过自然风机连续冷却样品的另一个表面(使材料产生连续的时间梯度)。在无负载电阻的情况下,储能最大值为1.75µJ,跨越100µF。在负载电阻为3 MΩ和10µF时,最大输出功率为0.76µW。
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引用次数: 8
Calculation ferroelectric hysteresis loop via an explicit function 通过显式函数计算铁电磁滞回线
IF 0.4 4区 物理与天体物理 Q4 Materials Science Pub Date : 2017-05-04 DOI: 10.1080/07315171.2017.1320493
L. Changshi
ABSTRACT In this paper, a very simple methodology to characterize the polarization of ferroelectrics via electrical field is proposed. This methodology allows us to use not only experimental electrical field-polarization curve as classical models do, but also physical status of ferroelectrics. The methodology is based on the use of Fermi-Dirac distribution, from eight measured P–E curves of two ferroelectrics materials, the theoretical polarization-electrical field curve repeat experimental path very well. Meanwhile, the effects of physical status on ferroelectric hysteresis loop are explained through mathematical route.
本文提出了一种通过电场表征铁电体极化的简单方法。这种方法使我们不仅可以像经典模型那样使用实验电场极化曲线,而且可以使用铁电体的物理状态。该方法基于费米-狄拉克分布,从8个测得的两种铁电材料的P-E曲线中,很好地重复了理论极化电场曲线的实验路径。同时,通过数学途径解释了物理状态对铁电磁滞回线的影响。
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引用次数: 2
Piezoelectric properties of PCW-PNN-PZT ceramics sintered at low temperature 低温烧结PCW-PNN-PZT陶瓷的压电性能
IF 0.4 4区 物理与天体物理 Q4 Materials Science Pub Date : 2017-05-04 DOI: 10.1080/07315171.2017.1319748
Yong-Jin Kim, J. Yoo, Jie-Young Lee
ABSTRACT In this study, in order to develop the composition ceramics for ultrasonic sensor application, Pb0.985Bi0.01(Co1/2W1/2)0.03(Ni1/3Nb2/3)0.09(ZrxTi1-x)0.88O3+0.25wt% CuO (abbreviated as PCW-PNN-PZT) system ceramics were prepared with the variations of x and then their phase microstructure, piezoelectric and dielectric characteristics were investigated with the variations of x. The compositions near the morphotropic phase boundary (MPB) appeared when x = 0.495. Moreover, the PCW-PNN-PZT ceramics could be sintered at low temperature of 920°C by adding sintering aids CuO. At sintering temperature of 920°C and x = 0.495 specimen, the density (ρ), electromechanical coupling factor(kp), dielectric constant (ϵr), mechanical quality (Qm) and piezoelectric constant (d33) piezoelectric figure of merit (d33·g33) indicated the optimal value of 7.94 g/cm3. 0.65, 1959, 356, 486 pC/N, and 15.56 [pm2/N], respectively, suitable for ultrasonic sensor application. The CuO was proved to lower the sintering temperature of piezoelectric ceramics due to the effects of PbO and CuO liquid phase.
为了开发用于超声传感器的复合陶瓷,在x的变化条件下制备了Pb0.985Bi0.01(Co1/2W1/2)0.03(Ni1/3Nb2/3)0.09(ZrxTi1-x)0.88O3+0.25wt% CuO(简称PCW-PNN-PZT)体系陶瓷,并对其相微观结构、压电和介电特性进行了研究。当x = 0.495时,相变相边界(MPB)附近出现了成分。此外,在920℃的低温下,加入助烧剂CuO可烧结PCW-PNN-PZT陶瓷。在烧结温度为920℃,x = 0.495时,试样的密度(ρ)、机电耦合系数(kp)、介电常数(ϵr)、机械质量(Qm)和压电常数(d33)的最佳值为7.94 g/cm3。分别为0.65、1959、356、486 pC/N和15.56 [pm2/N],适用于超声波传感器的应用。结果表明,由于PbO和CuO液相的作用,CuO能够降低压电陶瓷的烧结温度。
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引用次数: 4
Expand bandwidth of composite transducer via matching layer design 通过匹配层设计扩大复合传感器的带宽
IF 0.4 4区 物理与天体物理 Q4 Materials Science Pub Date : 2017-05-04 DOI: 10.1080/07315171.2017.1320502
Chao Zhong, Likun Wang, L. Qin, B. Yu
ABSTRACT The bandwidth of composite transducer was successfully expanded via matching layer design. Firstly, the admittance equation of transducer was deduced through combining the equivalent model of 1–3 piezoelectric composite with the electromechanical equivalent circuit of piezoelectric crystal thickness vibration. Then, the relations between bandwidth and the parameters of matching layer were summarized by the conductance curves. Finally, a composite transducer with matching layer was designed and fabricated. Experimental results show that the bandwidth reaches to 56 kHz and the mechanical quality factor Q drops to 1.8. The results are in agreement with the theoretical calculation.
通过匹配层设计,成功地扩展了复合传感器的带宽。首先,将1-3压电复合材料等效模型与压电晶体厚度振动的机电等效电路相结合,推导出换能器的导纳方程;然后通过电导曲线总结了带宽与匹配层参数之间的关系。最后,设计并制作了带匹配层的复合换能器。实验结果表明,带宽达到56 kHz,机械品质因子Q降至1.8。计算结果与理论计算相吻合。
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引用次数: 7
Thermoluminescence and kinetic study of low z LiAlO2:Dy/Eu phosphors 低z LiAlO2:Dy/Eu荧光粉的热发光及动力学研究
IF 0.4 4区 物理与天体物理 Q4 Materials Science Pub Date : 2017-05-04 DOI: 10.1080/07315171.2017.1256109
Monali R. Kadukara, P. W. Yawalkarb, S. P. Lochabc, S. J. Dhoblea, Sudhakar Reddyd, Deborah J. Taylor
ABSTRACT In the present article, polycrystalline low Z (Zeff = 8.19) LiAlO2:Dy/Eu phosphor prepared by simple wet chemical method. Thermoluminescence and some of the dosimetric characteristics of Dy/Eu activated LiAlO2 were reported. Samples in powder form were exposed to γ-ray irradiation with 137 Cs source for both LiAlO2:Dy and LiAlO2:Eu phosphors were studied for the first time. In case of LiAlO2:Dy phosphor shows one peak at 287°C and small hump at 335°C. However; LiAlO2:Eu phosphor shows glow peak at 272°C with a shoulder peak around 329°C. The TL sensitivity in both the cases were compared with CaSO4:Dy phosphor.LiAlO2:Dy sample have shown 1.23 times less sensitive than CaSO4:Dy and for LiAlO2:Eu is 5.6 times less sensitive than CaSO4:Dy.The TL response in the 0.001-0.043Gy dose range increased linearly with increase in radiation dose for both the samples. Fading study has been also done for both the samples. In addition to this trap parameters of LiAlO2:Dy/Eu were calculated by using computerized glow curve deconvolution and Chen's peak shape method.
本文采用简单湿化学法制备了低Z (Zeff = 8.19) LiAlO2:Dy/Eu多晶荧光粉。报道了Dy/Eu活化LiAlO2的热释光特性和一些剂量学特性。采用137cs源γ射线辐照,首次对粉末状的LiAlO2:Dy和LiAlO2:Eu荧光粉进行了研究。LiAlO2:Dy荧光粉在287℃时出现一个峰,在335℃时出现一个小峰。然而;LiAlO2:Eu荧光粉在272℃时出现发光峰,在329℃左右出现肩峰。将两种情况下的TL敏感性与CaSO4:Dy荧光体进行比较。LiAlO2:Dy样品的灵敏度比CaSO4:Dy低1.23倍,LiAlO2:Eu样品的灵敏度比CaSO4:Dy低5.6倍。两种样品在0.001 ~ 0.043 gy剂量范围内的TL响应随辐射剂量的增加呈线性增加。并对两种样品进行了褪色研究。此外,利用计算机辉光曲线反褶积和Chen峰形法计算了LiAlO2:Dy/Eu的捕集参数。
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引用次数: 2
Luminescence studies on BaSi6N8O: Eu3+ phosphors basi6n80o: Eu3+荧光粉的发光研究
IF 0.4 4区 物理与天体物理 Q4 Materials Science Pub Date : 2016-05-26 DOI: 10.1080/07315171.2016.1173983
Swati Anoop Fartode, B. Reddy, V. Nayar, S. Dhoble
ABSTRACT This paper reports on the BaSi6N8O:Eu3+ phosphor were prepared via modified two steps solid state diffusion technique in open air atmosphere and material was quenched at 1200°C for four hours. Eu3+ activated BaSi6N8O phosphor was characterized by XRD, which confirms the formation of the sample. From the Scanning electron microscope (SEM) images, the surface morphology of the sample has been studied. The photoluminescence (PL) spectra of BaSi6N8O:Eu3+ phosphor exhibits two emission bands at 614 nm (5D0→7F2) and at 587 nm (5D0→7F1) with an excitation wavelength of 396 nm. From the FTIR spectrum, bonding of atoms to each other and vibrational motions of molecules has been studied. ML was studied by dropping a piston on irradiated sample. From the ML glow curves single peak has been observed. ML intensity increases with activator concentration. Optimum ML has been observed for the sample having 1mole % of Eu ions.
摘要采用改进的两步固态扩散法制备了basi6n80:Eu3+荧光粉,并将材料在1200℃下淬火4小时。用XRD对Eu3+活化的basi6n80o荧光体进行了表征,证实了样品的形成。从扫描电子显微镜(SEM)图像,研究了样品的表面形貌。basi6n80:Eu3+荧光粉在激发波长为396 nm的614 nm (5D0→7F2)和587 nm (5D0→7F1)处有两个发光带。从FTIR光谱中,研究了原子之间的键合和分子的振动运动。通过在辐照样品上滴下活塞来研究ML。从ML发光曲线中观察到单峰。ML强度随活化剂浓度的增加而增加。对含有1mol % Eu离子的样品,观察到最佳ML值。
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引用次数: 1
An experimental study on thermal energy harvesting using Ca0.15(Sr0.5Ba0.5)0.85Nb2O5 pyroelectric ceramics Ca0.15(Sr0.5Ba0.5)0.85Nb2O5热释电陶瓷收集热能的实验研究
IF 0.4 4区 物理与天体物理 Q4 Materials Science Pub Date : 2016-05-26 DOI: 10.1080/07315171.2016.1174002
M. Vaish, N. A. Madhar, B. Ilahi, V. Chauhan, R. Vaish
Abstract Pyroelectric materials can be used for energy harvesting in integrated Micro-Electro-Mechanical-Systems (MEMS) and low power electronics devices. This paper considers the thermal energy harvesting using Ca0.15(Sr0.5Ba0.5)0.85Nb2O5 (CSBN) pyroelectric ceramics. Hot/cold air was used to generate a continuous temporal temperature profile on the material surfaces. The maximum open circuit voltage was observed as 0.26V. The maximum stored energy was 1.9 μJ in 47 μF capacitor (without load resistance). The maximum power was found to be 2.07nW across 3 MΩ and 47 μF.
热释电材料可用于集成微机电系统(MEMS)和低功耗电子器件的能量收集。本文研究了利用Ca0.15(Sr0.5Ba0.5)0.85Nb2O5 (CSBN)热释电陶瓷进行热能收集。冷热空气被用来在材料表面产生连续的时间温度分布。最大开路电压为0.26V。47 μF电容(无负载电阻)最大储能为1.9 μJ。在3 MΩ和47 μF之间的最大功率为2.07nW。
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引用次数: 10
A discussion: Why do the free, shielding charges really exist at the surface of a ferroelectric? 讨论:为什么自由的屏蔽电荷真的存在于铁电表面?
IF 0.4 4区 物理与天体物理 Q4 Materials Science Pub Date : 2016-05-26 DOI: 10.1080/07315171.2016.1171116
S. Ai, Shao-yin Zhang, Huai-tang Chen, Shao-hua Shi, Chuan-sheng Xu
ABSTRACT The classical explanation of the shielding charges at the surface of a ferroelectric was looked back at first. Then based on the non-equilibrium (or irreversible) thermodynamic description of ferroelectric phase transitions, a new explanation of that was given out. They agree with each other. In particular, the former is a special case of the latter.
摘要首先回顾了铁电体表面屏蔽电荷的经典解释。基于铁电相变的非平衡(或不可逆)热力学描述,给出了铁电相变的一种新的解释。他们意见一致。特别是前者是后者的特例。
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引用次数: 1
Ba0.6Sr0.4TiO3 thick film derived by polymer modified MOSD route for tunable microstrip antenna applications 高分子改性MOSD制备的可调谐微带天线用Ba0.6Sr0.4TiO3厚膜
IF 0.4 4区 物理与天体物理 Q4 Materials Science Pub Date : 2016-05-26 DOI: 10.1080/07315171.2016.1172001
R. Upadhyay, Sriranganath Annam, M. Patel, A. Sharma, Pratik Mevada, U. Joshi
ABSTRACT Frequency and phase agile microstrip antenna applications require relatively thick Barium Strontium Titanate (BST) films for good tunability. In this work, Polymer (PEG-200) modified MOSD process route is developed to produce cracks free (Ba0.6, Sr0.4) TiO3 Thick film on Low loss ST-X quartz substrate. Structural and electrical characteristics of the deposited films were investigated using Atomic Force Microscope, X-Ray Diffraction, C-V and C-F characterizations. XRD characterization conformed the single BST phase with polycrystalline nature of the film. AFM analysis depicted equiaxed shaped grains with average grain size and roughness of 120 nm and 4.15 nm respectively. Dielectric tunability, dielectric constant and loss tangent of the deposited films were 36.46%, 310 and 0.0213 respectively at 1 MHz frequency using MIM capacitive structure where conductive oxide LNO was used as bottom electrode. The applicability of polymer modified BST thick films over low loss substrate as composite substrate for tunable microstrip antenna applications at microwave frequency was demonstrated by design, fabrication and testing of a compact frequency tunable microstrip antenna in coplanar configuration. The tunability exhibited at X band frequency proves the suitability of developed processed route for tunable antenna applications.
频率和相位灵活的微带天线应用需要相对厚的钛酸钡锶(BST)薄膜,以获得良好的可调性。本文研究了聚合物(PEG-200)改性MOSD的工艺路线,在低损耗ST-X石英衬底上制备无裂纹(Ba0.6, Sr0.4) TiO3厚膜。利用原子力显微镜、x射线衍射、C-V和C-F表征等手段研究了沉积膜的结构和电特性。XRD表征表明该薄膜具有单BST相和多晶性质。AFM分析显示晶粒为等轴形,平均晶粒尺寸为120 nm,粗糙度为4.15 nm。采用导电氧化物LNO作为底电极的MIM电容结构,在1 MHz频率下,沉积膜的介电可调性、介电常数和损耗正切分别为36.46%、310和0.0213。通过设计、制造和测试一种共面结构的小型频率可调微带天线,验证了聚合物改性BST厚膜在低损耗衬底上作为微波频率可调微带天线复合衬底的适用性。在X波段表现出的可调谐性证明了所开发的加工路线适合于可调谐天线的应用。
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引用次数: 3
期刊
Ferroelectrics Letters Section
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