Pub Date : 2021-11-01DOI: 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.
{"title":"High-frequency wide beam underwater transducer based on 1–3 piezocomposite","authors":"Chao Zhong, Junan Xu, Shaohua Hao, Yanjun Zhang, Likun Wang, L. Qin","doi":"10.1080/07315171.2021.1971009","DOIUrl":"https://doi.org/10.1080/07315171.2021.1971009","url":null,"abstract":"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.","PeriodicalId":50451,"journal":{"name":"Ferroelectrics Letters Section","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74740496","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-11-01DOI: 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.
{"title":"Optimized testing of package for stacked piezoelectric energy harvester in roadway applications","authors":"Peng Wang, Run Cheng, G. Ding, Jun Wang, Zhiming Liu, Haotong Zhang","doi":"10.1080/07315171.2021.1971010","DOIUrl":"https://doi.org/10.1080/07315171.2021.1971010","url":null,"abstract":"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.","PeriodicalId":50451,"journal":{"name":"Ferroelectrics Letters Section","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80326275","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-11-01DOI: 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.
{"title":"Monte Carlo simulation for predicting neutron-induced single-event upset in ferroelectric random access memory","authors":"Hong Zhang, Jing Huang, H. Guo, Z. Lei, B. Li","doi":"10.1080/07315171.2021.1971011","DOIUrl":"https://doi.org/10.1080/07315171.2021.1971011","url":null,"abstract":"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.","PeriodicalId":50451,"journal":{"name":"Ferroelectrics Letters Section","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90390562","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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.
{"title":"Investigation on microscopic mechanisms of high-Curie temperature PMN-PH-PT piezoelectric ceramics","authors":"Rongfeng Zhu, B. Fang, Xiang-juan Zhao, Shuai Zhang, Xiaolong Lu, Jianning Ding","doi":"10.1080/07315171.2021.1971008","DOIUrl":"https://doi.org/10.1080/07315171.2021.1971008","url":null,"abstract":"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.","PeriodicalId":50451,"journal":{"name":"Ferroelectrics Letters Section","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77408187","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-11-01DOI: 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.
{"title":"Exchange bias and vertical shift of the magnetic hysteresis loop in Co/BiFeO3 bilayers","authors":"Liyan Wang, Changzheng Wang","doi":"10.1080/07315171.2021.1971006","DOIUrl":"https://doi.org/10.1080/07315171.2021.1971006","url":null,"abstract":"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.","PeriodicalId":50451,"journal":{"name":"Ferroelectrics Letters Section","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85783596","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-08-11DOI: 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。
{"title":"Critical magnetic behavior of the half Heusler alloy RhCrSi: Monte Carlo study","authors":"S. Idrissi, S. Ziti, H. Labrim, L. Bahmad","doi":"10.1080/07315171.2022.2076468","DOIUrl":"https://doi.org/10.1080/07315171.2022.2076468","url":null,"abstract":"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.","PeriodicalId":50451,"journal":{"name":"Ferroelectrics Letters Section","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2021-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72708715","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-06-01DOI: 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。
{"title":"Effect of alternative mechanochemical method on modified bismuth titanate","authors":"Nagbasavanna Sharanappa, A. Bidve","doi":"10.1080/07315171.2021.1923118","DOIUrl":"https://doi.org/10.1080/07315171.2021.1923118","url":null,"abstract":"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.","PeriodicalId":50451,"journal":{"name":"Ferroelectrics Letters Section","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76510978","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-04-30DOI: 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.
{"title":"On the Capacitance of Piezoelectric Metal–Insulator–Semiconductor Junctions","authors":"Lei Yang, Jianke Du, Ji Wang, Jia-shi Yang","doi":"10.1080/07315171.2021.1923115","DOIUrl":"https://doi.org/10.1080/07315171.2021.1923115","url":null,"abstract":"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.","PeriodicalId":50451,"journal":{"name":"Ferroelectrics Letters Section","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2021-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76234572","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-04-30DOI: 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。
{"title":"Low temperature investigation on dielectric properties of carbon doped copper oxide","authors":"Hema Chandra Rao Bitra, A. Rao, K. S. Babu, G. N. Rao","doi":"10.1080/07315171.2021.1923120","DOIUrl":"https://doi.org/10.1080/07315171.2021.1923120","url":null,"abstract":"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.","PeriodicalId":50451,"journal":{"name":"Ferroelectrics Letters Section","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2021-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83144629","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-04-30DOI: 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.
{"title":"Influence of moisture on ferroelectric–paraelectric phase transition of a composite containing oxidized MWCNT and TGS","authors":"H. Nguyen, Phan Thi Hong Thao","doi":"10.1080/07315171.2021.1923116","DOIUrl":"https://doi.org/10.1080/07315171.2021.1923116","url":null,"abstract":"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.","PeriodicalId":50451,"journal":{"name":"Ferroelectrics Letters Section","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2021-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82383612","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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