Pub Date : 2012-07-09DOI: 10.1109/ISAF.2012.6297834
E. Ramana, M. Graça, J. Monteiro, S. Mendiratta, M. Valente
Particulate composites of (Na0.5Bi0.5TiO3)-BaTiO3(NBBT)+(Co0.6Zn0.4)(Fe1.7Mn0.3)O4 (CZFMO) were synthesized by the conventional ceramic method to study ferroelectric, magnetic and magnetoelectric properties. Ferroelectric switching has been seen in all the ferroelectric and composite ceramics. Remanent polarization of 34 and 26μC/cm2 was obtained for the pure and 85 mol% NBT-BT ceramics, while a larger leakage current was observed for the remaining composites. The magnetoelectric coefficient (αME) of 8 mV/cm-Oe was observed in the composition with 65 mol% ferroelectric and the coupling seems to be lower for higher ferroelectric content ceramics. A change of ~10% in saturated magnetization was observed in composites of 65 mol% NBBT, which is an indication of the converse magnetoelectric effect. The results indicate that these lead-free composites are promising and can be tunable for the low-field magnetoelectric applications.
采用常规陶瓷法制备了(Na0.5Bi0.5TiO3)-BaTiO3(NBBT)+(Co0.6Zn0.4)(Fe1.7Mn0.3)O4 (CZFMO)颗粒复合材料，研究了其铁电、磁性和磁电性能。在所有的铁电陶瓷和复合陶瓷中都可以看到铁电开关。纯NBT-BT陶瓷和85 mol% NBT-BT陶瓷的剩余极化为34 μ c /cm2和26μC/cm2，剩余材料的漏电流较大。在铁电含量为65%的陶瓷中，磁电系数(αME)为8 mV/cm-Oe，铁电含量越高，耦合越小。在65 mol% NBBT的复合材料中观察到饱和磁化强度变化约10%，这表明存在逆磁电效应。结果表明，这些无铅复合材料具有良好的应用前景，可用于低场磁电应用。
{"title":"Improved magnetoelectric effect in modified (Na0.5Bi0.5)TiO3-BaTiO3-CoFe2O4 lead-free multiferroic composites","authors":"E. Ramana, M. Graça, J. Monteiro, S. Mendiratta, M. Valente","doi":"10.1109/ISAF.2012.6297834","DOIUrl":"https://doi.org/10.1109/ISAF.2012.6297834","url":null,"abstract":"Particulate composites of (Na<sub>0.5</sub>Bi<sub>0.5</sub>TiO<sub>3</sub>)-BaTiO<sub>3</sub>(NBBT)+(Co<sub>0.6</sub>Zn<sub>0.4</sub>)(Fe<sub>1.7</sub>Mn<sub>0.3</sub>)O<sub>4</sub> (CZFMO) were synthesized by the conventional ceramic method to study ferroelectric, magnetic and magnetoelectric properties. Ferroelectric switching has been seen in all the ferroelectric and composite ceramics. Remanent polarization of 34 and 26μC/cm<sup>2</sup> was obtained for the pure and 85 mol% NBT-BT ceramics, while a larger leakage current was observed for the remaining composites. The magnetoelectric coefficient (α<sub>ME</sub>) of 8 mV/cm-Oe was observed in the composition with 65 mol% ferroelectric and the coupling seems to be lower for higher ferroelectric content ceramics. A change of ~10% in saturated magnetization was observed in composites of 65 mol% NBBT, which is an indication of the converse magnetoelectric effect. The results indicate that these lead-free composites are promising and can be tunable for the low-field magnetoelectric applications.","PeriodicalId":20497,"journal":{"name":"Proceedings of ISAF-ECAPD-PFM 2012","volume":"12 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2012-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89978159","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
(Li, Ce) doped CaBi4Ti4O15 (CBT) ceramics were prepared using the conventional solid state method. The crystal structure and microstructure of CBT-based ceramics were determined by the X-ray diffraction and scanning electron microscopy. It was found that the (Li, Ce) ions diffused into the A site of pseudo-perovskite structure and formed single Aurivillius type structure. The Curie-temperature (TC) of CBT ceramics decreased whereas the piezoelectric coefficient (d33) was improved with the increasing of (Li, Ce) dopants. Furthermore, the impedance spectrum techniques were invoked to understand the electrical properties for pure or modified-CBT compounds at high temperature region and the underlying physical mechanism were also discussed.
{"title":"Microstructure and impedance analysis of CaBi4Ti4O15 piezoceramics with (LiCe)-modifications","authors":"Zhihang Peng, Fengkang Huang, Qiang Chen, Shao-Kui Bao, Xiao-Xue Wang, D. Xiao, Jianguo Zhu","doi":"10.1109/ISAF.2012.6297791","DOIUrl":"https://doi.org/10.1109/ISAF.2012.6297791","url":null,"abstract":"(Li, Ce) doped CaBi4Ti4O15 (CBT) ceramics were prepared using the conventional solid state method. The crystal structure and microstructure of CBT-based ceramics were determined by the X-ray diffraction and scanning electron microscopy. It was found that the (Li, Ce) ions diffused into the A site of pseudo-perovskite structure and formed single Aurivillius type structure. The Curie-temperature (TC) of CBT ceramics decreased whereas the piezoelectric coefficient (d33) was improved with the increasing of (Li, Ce) dopants. Furthermore, the impedance spectrum techniques were invoked to understand the electrical properties for pure or modified-CBT compounds at high temperature region and the underlying physical mechanism were also discussed.","PeriodicalId":20497,"journal":{"name":"Proceedings of ISAF-ECAPD-PFM 2012","volume":"309 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2012-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79618559","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-07-09DOI: 10.1109/ISAF.2012.6297752
B. Rožič, J. Koruza, Z. Kutnjak, B. Malič, M. Kosec
By utilizing direct measurements of the electrocaloric effect (ECE) temperature change via high-resolution calorimeter, the ECE has been studied in bulk lead-free relaxor K0.5Na0.5NbO3-SrTiO3 (KNN-STO) ceramics. Observed magnitude of the ECE confirms existence of the large EC effect in this system near the ferroelectric phase transition.
{"title":"Direct measurements of the electrocaloric effect in lead-free K0.5Na0.5NbO3-SrTiO3 ceramics sintered in air","authors":"B. Rožič, J. Koruza, Z. Kutnjak, B. Malič, M. Kosec","doi":"10.1109/ISAF.2012.6297752","DOIUrl":"https://doi.org/10.1109/ISAF.2012.6297752","url":null,"abstract":"By utilizing direct measurements of the electrocaloric effect (ECE) temperature change via high-resolution calorimeter, the ECE has been studied in bulk lead-free relaxor K<sub>0.5</sub>Na<sub>0.5</sub>NbO<sub>3</sub>-SrTiO<sub>3</sub> (KNN-STO) ceramics. Observed magnitude of the ECE confirms existence of the large EC effect in this system near the ferroelectric phase transition.","PeriodicalId":20497,"journal":{"name":"Proceedings of ISAF-ECAPD-PFM 2012","volume":"17 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2012-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81962753","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-07-09DOI: 10.1109/ISAF.2012.6297747
D. Sanchez, N. Ortega, R. Katiyar, A. Kumar, J. Scott
Solid solution of (PbFe0.5Ta0.5O3)x-(PbZr0.53Ti0.47O3)(1-x) (0.1≤ × ≤ 0.4) perovskite type structure produces a single phase materials, both in ceramic and thin films form. This novel material has low loss, possesses room temperature multiferroic properties, and has strong magnetoelectric coupling.
{"title":"Room temperature novel multiferroic single phase materials: (PbFe0.5Ta0.5O3)x-(PbZr0.53Ti0.47O3)(1−x)","authors":"D. Sanchez, N. Ortega, R. Katiyar, A. Kumar, J. Scott","doi":"10.1109/ISAF.2012.6297747","DOIUrl":"https://doi.org/10.1109/ISAF.2012.6297747","url":null,"abstract":"Solid solution of (PbFe<sub>0.5</sub>Ta<sub>0.5</sub>O<sub>3</sub>)<sub>x</sub>-(PbZr<sub>0.53</sub>Ti<sub>0.47</sub>O<sub>3</sub>)<sub>(1-x)</sub> (0.1≤ × ≤ 0.4) perovskite type structure produces a single phase materials, both in ceramic and thin films form. This novel material has low loss, possesses room temperature multiferroic properties, and has strong magnetoelectric coupling.","PeriodicalId":20497,"journal":{"name":"Proceedings of ISAF-ECAPD-PFM 2012","volume":"10 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2012-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82542556","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-07-09DOI: 10.1109/ISAF.2012.6297762
L. Pardo, A. García, K. Brebøl, E. Mercadelli, C. Galassi
Undoped (Bi0.5Na0.5)0.96Ba0.04TiO3 ceramics were prepared from mixed oxides and sol-gel autocombustion powder. Similar dielectric and electromechanical properties were found for both but sol-gel derived ceramics can be obtained with a lower thermal budget, which prevent losses of volatiles. Dielectric anisotropy is observed. All the features of the thermal evolution curves of εT11 are observed at temperatures clearly displaced towards higher values with respect to those of the εT33 curves. There is also anisotropy in the depoling process. When depoling is monitored in-situ using the shear mode of thickness poled plates, resonance is observed at Td >; 150°C. Besides, hot in-situ measurements of time dependence of the resonaces of disks and plates at temperatures below Td showed that the depolarization of BNBT4 is a dynamical process.
{"title":"Anisotropy and dynamic thermal depolarization of 0.96(Bi0.5Na0.5)TiO3-0.04 BaTiO3 lead-free piezoceramics","authors":"L. Pardo, A. García, K. Brebøl, E. Mercadelli, C. Galassi","doi":"10.1109/ISAF.2012.6297762","DOIUrl":"https://doi.org/10.1109/ISAF.2012.6297762","url":null,"abstract":"Undoped (Bi<sub>0.5</sub>Na<sub>0.5</sub>)<sub>0.96</sub>Ba<sub>0.04</sub>TiO<sub>3</sub> ceramics were prepared from mixed oxides and sol-gel autocombustion powder. Similar dielectric and electromechanical properties were found for both but sol-gel derived ceramics can be obtained with a lower thermal budget, which prevent losses of volatiles. Dielectric anisotropy is observed. All the features of the thermal evolution curves of ε<sup>T</sup><sub>11</sub> are observed at temperatures clearly displaced towards higher values with respect to those of the ε<sup>T</sup><sub>33</sub> curves. There is also anisotropy in the depoling process. When depoling is monitored in-situ using the shear mode of thickness poled plates, resonance is observed at T<sub>d</sub> >; 150°C. Besides, hot in-situ measurements of time dependence of the resonaces of disks and plates at temperatures below T<sub>d</sub> showed that the depolarization of BNBT4 is a dynamical process.","PeriodicalId":20497,"journal":{"name":"Proceedings of ISAF-ECAPD-PFM 2012","volume":"9 40 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2012-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83082859","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-07-09DOI: 10.1109/ISAF.2012.6297733
M. Hejazi, B. Jadidian, Ahmad Safari
This paper discusses the fabrication and characterization of a single element ultrasonic transducer with a lead-free piezoelectric active element. A piezoelectric ceramic with composition of 0.88Bi0.5Na0.5TiO3-0.08Bi0.5K0.5TiO3-0.04Bi0.5Li0.5TiO3 was chosen as the active element of the transducer. This composition exhibited a thickness coupling coefficient (kt) of 0.45, a dielectric constant of 440 (at 1 kHz), and a longitudinal piezoelectric coefficient (d33) of 84 pC.N-1. To make the transducer, the ceramic was sandwiched between an epoxy-tungsten backing layer and a silver epoxy matching layer. An epoxy lens was also incorporated into the transducer's design to focus the ultrasound beam. The focused transducer with a center frequency of about 23 MHz demonstrated a -6 dB bandwidth of 55% and an insertion loss of -32 dB, while the -20dB pulsed length was measured to be 150 ns. A phantom made of copper wires (30 μm in diameter) was utilized to investigate the imaging capability of the transducer. The results indicated that the fabricated transducer with a lateral resolution of 260 μm and a relatively high depolarization temperature could be considered as a candidate for replacement of lead-based ultrasonic transducers.
{"title":"Fabrication and evaluation of a single element lead free-based ultrasonic transducer","authors":"M. Hejazi, B. Jadidian, Ahmad Safari","doi":"10.1109/ISAF.2012.6297733","DOIUrl":"https://doi.org/10.1109/ISAF.2012.6297733","url":null,"abstract":"This paper discusses the fabrication and characterization of a single element ultrasonic transducer with a lead-free piezoelectric active element. A piezoelectric ceramic with composition of 0.88Bi<sub>0.5</sub>Na<sub>0.5</sub>TiO<sub>3</sub>-0.08Bi<sub>0.5</sub>K<sub>0.5</sub>TiO<sub>3</sub>-0.04Bi<sub>0.5</sub>Li<sub>0.5</sub>TiO<sub>3</sub> was chosen as the active element of the transducer. This composition exhibited a thickness coupling coefficient (k<sub>t</sub>) of 0.45, a dielectric constant of 440 (at 1 kHz), and a longitudinal piezoelectric coefficient (d<sub>33</sub>) of 84 pC.N<sup>-1</sup>. To make the transducer, the ceramic was sandwiched between an epoxy-tungsten backing layer and a silver epoxy matching layer. An epoxy lens was also incorporated into the transducer's design to focus the ultrasound beam. The focused transducer with a center frequency of about 23 MHz demonstrated a -6 dB bandwidth of 55% and an insertion loss of -32 dB, while the -20dB pulsed length was measured to be 150 ns. A phantom made of copper wires (30 μm in diameter) was utilized to investigate the imaging capability of the transducer. The results indicated that the fabricated transducer with a lateral resolution of 260 μm and a relatively high depolarization temperature could be considered as a candidate for replacement of lead-based ultrasonic transducers.","PeriodicalId":20497,"journal":{"name":"Proceedings of ISAF-ECAPD-PFM 2012","volume":"1 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2012-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87900142","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-07-09DOI: 10.1109/ISAF.2012.6297737
R. L. Moreira
Relaxor features were induced in an equimolar P(VDF-TrFE) copolymer by high doses of γ-rays. The electrocaloric responses of the samples were investigated, before and after irradiation. For the virgin copolymer, the maxima isothermal entropy change (ΔS ≈ 22.5 J/kgK) and adiabatic temperature change (ΔT ≈ 6 K) of conformational origin were observed at 90 °C and above, for a 120 MV/m applied electric field. For the γ-irradiated sample, we observed the lowering of the working temperature range by circa 15 °C, but higher external electric fields of 160 MV/m were required to recover the large level of electrocaloric response in these polymeric relaxors. The refrigerant capacity of the materials, virgin or relaxors, was evaluated as 130 J/kg, showing their high potential for applications as electrocaloric refrigerators.
{"title":"Electrocaloric effect in γ-irradiated P(VDF-TrFE) relaxors","authors":"R. L. Moreira","doi":"10.1109/ISAF.2012.6297737","DOIUrl":"https://doi.org/10.1109/ISAF.2012.6297737","url":null,"abstract":"Relaxor features were induced in an equimolar P(VDF-TrFE) copolymer by high doses of γ-rays. The electrocaloric responses of the samples were investigated, before and after irradiation. For the virgin copolymer, the maxima isothermal entropy change (ΔS ≈ 22.5 J/kgK) and adiabatic temperature change (ΔT ≈ 6 K) of conformational origin were observed at 90 °C and above, for a 120 MV/m applied electric field. For the γ-irradiated sample, we observed the lowering of the working temperature range by circa 15 °C, but higher external electric fields of 160 MV/m were required to recover the large level of electrocaloric response in these polymeric relaxors. The refrigerant capacity of the materials, virgin or relaxors, was evaluated as 130 J/kg, showing their high potential for applications as electrocaloric refrigerators.","PeriodicalId":20497,"journal":{"name":"Proceedings of ISAF-ECAPD-PFM 2012","volume":"370 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2012-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75508652","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-07-09DOI: 10.1109/ISAF.2012.6297828
D. Olmos, G. González‐Gaitano, R. Vela, L. Cordoba, J. González‐Benito, A. Kholkin
In this work, PVDF-BaTiO3 composites were prepared using cryogenic high-energy ball milling (HEBM). PVDF-BaTiO3 mixtures with different weight fractions of submicrometric BaTiO3 particles were subjected to 1 h of effective milling. By applying pressure at 200 °C the resulting powder was molded in the form of relatively thin discs. Morphological and structural characterization of the materials was done using conventional techniques (DSC, FTIR, XRD, SEM). Piezoelectric characterization of the specimens was also carried out. Macroscopic tapping was used to induce a voltage in the materials. It was found that the output voltage decreases with the amount of BaTiO3 particles. Finally, the piezoelectric behavior response of the samples was followed by an AFM microscope, the vertical deflection of the cantilever was obtained when an electrical signal was applied to the samples.
{"title":"Flexible PVDF-BaTiO3 nanocomposites for pressure sensors","authors":"D. Olmos, G. González‐Gaitano, R. Vela, L. Cordoba, J. González‐Benito, A. Kholkin","doi":"10.1109/ISAF.2012.6297828","DOIUrl":"https://doi.org/10.1109/ISAF.2012.6297828","url":null,"abstract":"In this work, PVDF-BaTiO3 composites were prepared using cryogenic high-energy ball milling (HEBM). PVDF-BaTiO3 mixtures with different weight fractions of submicrometric BaTiO3 particles were subjected to 1 h of effective milling. By applying pressure at 200 °C the resulting powder was molded in the form of relatively thin discs. Morphological and structural characterization of the materials was done using conventional techniques (DSC, FTIR, XRD, SEM). Piezoelectric characterization of the specimens was also carried out. Macroscopic tapping was used to induce a voltage in the materials. It was found that the output voltage decreases with the amount of BaTiO3 particles. Finally, the piezoelectric behavior response of the samples was followed by an AFM microscope, the vertical deflection of the cantilever was obtained when an electrical signal was applied to the samples.","PeriodicalId":20497,"journal":{"name":"Proceedings of ISAF-ECAPD-PFM 2012","volume":"48 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2012-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75783147","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-07-09DOI: 10.1109/ISAF.2012.6297852
N. Y. Firsova, E. Mishina, S. Senkevich, I. P. Pronin, I. Bdikin, A. Kholkin
Ti-sapphire femtosecond laser was utilized to crystallize Pb(Zr0,54, Ti0,46)O3 (PZT) film on platinized silicon substrate. Second harmonic generation was used to in-situ monitor of the annealing process and to confirm a non-centrosymmetric perovskite ferroelectric phase of the irradiated area. Piezo-force microscopy technique allowed us to investigate local polarization properties of annealed areas.
{"title":"Femtosecond infrared laser annealing of ferroelectric PZT films on a metal substrate","authors":"N. Y. Firsova, E. Mishina, S. Senkevich, I. P. Pronin, I. Bdikin, A. Kholkin","doi":"10.1109/ISAF.2012.6297852","DOIUrl":"https://doi.org/10.1109/ISAF.2012.6297852","url":null,"abstract":"Ti-sapphire femtosecond laser was utilized to crystallize Pb(Zr0,54, Ti0,46)O3 (PZT) film on platinized silicon substrate. Second harmonic generation was used to in-situ monitor of the annealing process and to confirm a non-centrosymmetric perovskite ferroelectric phase of the irradiated area. Piezo-force microscopy technique allowed us to investigate local polarization properties of annealed areas.","PeriodicalId":20497,"journal":{"name":"Proceedings of ISAF-ECAPD-PFM 2012","volume":"107 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2012-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74781083","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-07-09DOI: 10.1109/ISAF.2012.6297761
H. Jung, K. H. Baek, S. Hidaka, D. Song, Se Bin Kim, T. Sung
Two models for energy harvesting system imparting rotational energy to piezoelectric materials are presented in order to compare the effects of applying identical amounts of energy to a cantilever beam by strain-changing and shock application. For a piezoelectric system given a high impulse with low displacement, higher power outputs were generated at lower resistive loads. Conversely, for a system with high displacement at a low impulse, power output was higher at high resistive loads. At matched impedance, the secondary shock system generated higher power output than the hitting system did at low resistive load. Optimized response of secondary shock system was obtained at a frequency of 60 Hz with a low resistive load of 1 k Ω. The generated output power was measured 124 mW, which corresponds to power density of 140 mW/cm3 for entire cantilever beam and power density of 342 mW/cm3 for only piezoelectric material volume. For a system without a secondary impulse at low resistive loads (1 k Ω), the optimizing frequency was between 20 and 30 Hz, with an output power of 22 mW, which corresponds to a 25 mW/cm3 power density for entire cantilever beam and power density of 60 mW/ cm3 for only piezoelectric material volume.
为了比较在悬臂梁上施加相同能量时的应变变化效应和冲击效应，提出了两种传递旋转能量给压电材料的能量收集系统模型。对于给定高脉冲、低位移的压电系统，在低阻性负载下产生较高的输出功率。相反，对于一个在低脉冲下具有高位移的系统，在高电阻负载下输出功率更高。在阻抗匹配时，二次冲击系统比低阻负载下的冲击系统产生更高的功率输出。二次冲击系统在频率为60 Hz、低电阻负载为1 k Ω时的响应得到了优化。测量产生的输出功率为124 mW，对应于整个悬臂梁的功率密度为140 mW/cm3，仅压电材料体积的功率密度为342 mW/cm3。对于低阻性负载(1 k Ω)下无二次脉冲的系统，优化频率在20至30 Hz之间，输出功率为22 mW，对应于整个悬臂梁的功率密度为25 mW/cm3，仅压电材料体积的功率密度为60 mW/cm3。
{"title":"Design and optimization of secondary shock type piezoelectric system","authors":"H. Jung, K. H. Baek, S. Hidaka, D. Song, Se Bin Kim, T. Sung","doi":"10.1109/ISAF.2012.6297761","DOIUrl":"https://doi.org/10.1109/ISAF.2012.6297761","url":null,"abstract":"Two models for energy harvesting system imparting rotational energy to piezoelectric materials are presented in order to compare the effects of applying identical amounts of energy to a cantilever beam by strain-changing and shock application. For a piezoelectric system given a high impulse with low displacement, higher power outputs were generated at lower resistive loads. Conversely, for a system with high displacement at a low impulse, power output was higher at high resistive loads. At matched impedance, the secondary shock system generated higher power output than the hitting system did at low resistive load. Optimized response of secondary shock system was obtained at a frequency of 60 Hz with a low resistive load of 1 k Ω. The generated output power was measured 124 mW, which corresponds to power density of 140 mW/cm3 for entire cantilever beam and power density of 342 mW/cm3 for only piezoelectric material volume. For a system without a secondary impulse at low resistive loads (1 k Ω), the optimizing frequency was between 20 and 30 Hz, with an output power of 22 mW, which corresponds to a 25 mW/cm3 power density for entire cantilever beam and power density of 60 mW/ cm3 for only piezoelectric material volume.","PeriodicalId":20497,"journal":{"name":"Proceedings of ISAF-ECAPD-PFM 2012","volume":"48 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2012-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73370096","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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