Journals >Journal of Advanced Dielectrics
Contents
2023
Volume: 13 Issue 4
11 Article(s)
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Research Articles
Editorial: Special Issue on Functional Dielectrics
Thulasinath Raman Venkatesan, and Zhongyang Cheng
Journal of Advanced Dielectrics
- Publication Date: Jan. 01, 1900
- Vol. 13, Issue 4, 2302001 (2023)
Preparation and energy storage properties of
Zhengu Chen, Fan Chang, Gengguang Luo, Li Ma, Ju Chen, Jinge Pei, Zhenyong Cen, Qin Feng, Fujita Toyohisa, and Nengneng Luo
Dielectric materials with high energy storage density (Wrec) and efficiency (η) are expected for energy storage capacitors. In this work, 〈001〉-textured Na0.7Bi0.1NbO3 (NBN) ceramics were prepared by a templated grain growth technique. The effects of microstructure and orientation degree on dielectric properties, polarDielectric materials with high energy storage density (
Journal of Advanced Dielectrics
- Publication Date: Jan. 01, 1900
- Vol. 13, Issue 4, 2341001 (2023)
High-accuracy characterization of pyroelectric materials: A noncontact method based on surface potential measurements
Reinhard Schwödiauer, Simona Bauer-Gogonea, Martin Kaltenbrunner, Volodymyr Tkachenko, and Simonetta Grilli
The characterization of pyroelectric materials is essential for the design of pyroelectric-based devices. Pyroelectric current measurement is the commonly employed method, but can be complex and requires surface electrodes. Here, we present noncontact electrostatic voltmeter measurements as a simple but highly accurateThe characterization of pyroelectric materials is essential for the design of pyroelectric-based devices. Pyroelectric current measurement is the commonly employed method, but can be complex and requires surface electrodes. Here, we present noncontact electrostatic voltmeter measurements as a simple but highly accurate alternative, by assessing thermally-induced pyroelectric surface potential variations. We introduce a refined model that relates the surface potential variations to both the pyroelectric coefficient and the characteristic figure of merit (FOM) and test the model with square-shaped samples made from PVDF, LiNbO3 and LiTaO3. The characteristic pyroelectric coefficient for PVDF, LiNbO3 and LiTaO3 was found to be 33.4, 59.9 and 208.4
Journal of Advanced Dielectrics
- Publication Date: Jan. 01, 1900
- Vol. 13, Issue 4, 2341002 (2023)
Orientation dependence on piezoresponse of lead-free piezoelectric sodium bismuth titanate epitaxial thin films
Jinyan Zhao, Wei Ren, Zhe Wang, Gang Niu, Lingyan Wang, and Yulong Zhao
Lead-free piezoelectric sodium bismuth titanate ((Bi0.5Na0.5)TiO3, BNT) thin films were epitaxially grown onto (001)-, (110)-, and (111)-oriented Nb:SrTiO3 (STO) single crystal substrates prepared by sol–gel processing. Highly oriented growth in (001), (110), and (111) BNT thin films was obtained in this work benefitinLead-free piezoelectric sodium bismuth titanate ((
Journal of Advanced Dielectrics
- Publication Date: Jan. 01, 1900
- Vol. 13, Issue 4, 2341003 (2023)
Ferroelectricity in biological building blocks: Slipping on a banana peel?
Syed A. M. Tofail
Ferroelectricity in biological system has been anticipated both theoretically and experimentally over the past few decades. Claims of ferroelectricity in biological systems have given rise to confusion and methodological controversy. Over the years, a “loop” of induced polarization in response to a varying applied elecFerroelectricity in biological system has been anticipated both theoretically and experimentally over the past few decades. Claims of ferroelectricity in biological systems have given rise to confusion and methodological controversy. Over the years, a “loop” of induced polarization in response to a varying applied electrical field and a consequent polarization reversal has prompted many researchers to claim ferroelectricity in biological structures and their building blocks. Other observers were skeptical about the methodology adopted in generating the data and questioned the validity of the claimed ferroelectricity as such, “loop” can also be obtained from linear capacitors. In a paper with somewhat tongue-in-cheek title, Jim Scott showed that ordinary banana peels could exhibit closed loops of electrical charge which closely resemble and thus could be misinterpreted as ferroelectric hysteresis loops in barium sodium niobate, BNN paraphrasing it as “banana”. In this paper, we critically review ferroelectricity in biological system and argue that knowing the molecular and crystalline structure of biological building blocks and experimenting on such building blocks may be the way forward in revealing the “true” nature of ferroelectricity in biological systems..
Journal of Advanced Dielectrics
- Publication Date: Jan. 01, 1900
- Vol. 13, Issue 4, 2341004 (2023)
Impact of oxygen-containing carbonyl and ether groups on dielectric properties of poly(oxa)norbornene cyclic olefins
Chao Wu, Ajinkya A. Deshmukh, Lihua Chen, Rampi Ramprasad, Gregory A. Sotzing, and Yang Cao
Flexible dielectric polymers that can withstand high electric field and simultaneously have high dielectric constant are desired for high-density energy storage. Here, we systematically investigated the impact of oxygen-containing ether and carbonyl groups in the backbone structure on dielectric properties of a series Flexible dielectric polymers that can withstand high electric field and simultaneously have high dielectric constant are desired for high-density energy storage. Here, we systematically investigated the impact of oxygen-containing ether and carbonyl groups in the backbone structure on dielectric properties of a series of cyclic olefin. In comparison to the influence of the –CF3 pendant groups that had more impact on the dielectric constant rather than the band gap, the change of the backbone structure affected both the dielectric constant and band gaps. The one polymer with ether and carbonyl groups in the backbone has the largest band gap and highest discharge efficiency, while it has the lowest dielectric constant. The polymer without any ether groups in the backbone has the smallest band gap and lowest discharge efficiency, but it has the highest dielectric constant. Polymers that have no dipolar relaxation exhibit an inversely correlated dielectric constant and band gap. Enhancing the dipolar relaxation through rational molecular structure design can be a novel way to break through the exclusive constraint of dielectric constant and band gap for high-density energy storage..
Journal of Advanced Dielectrics
- Publication Date: Jan. 01, 1900
- Vol. 13, Issue 4, 2341005 (2023)
Structure and ferroelectric properties of P(VDF-TrFE) films prepared under different conditions — Effect of filtration of the copolymer solution
B. Ploss, D. Smykalla, and S. Engel
Vinylidene fluoride-trifluoroethylene copolymer films of molar ratio 70/30 with thickness of about 1 μm have been deposited from solution in ethyl methyl ketone to a glass substrate with an aluminum electrode by spin coating. The solution has been filtrated through a PTFE membrane filter with pore size 0.2 μm directly Vinylidene fluoride-trifluoroethylene copolymer films of molar ratio 70/30 with thickness of about 1
Journal of Advanced Dielectrics
- Publication Date: Jan. 01, 1900
- Vol. 13, Issue 4, 2341006 (2023)
History and recent progress in ferroelectrets produced in Brazil
Ruy Alberto Pisani Altafim, and Ruy Alberto Corrêa Altafim
More than 30 years ago, a group of researchers in Tampere–Finland developed a thin foamed polymeric material for capacitive sensors. Such soft-voided films exhibited electrical charging characteristics, forming a powerful combination, which resulted in a smart-material with ferroelectric properties. The discovery of thMore than 30 years ago, a group of researchers in Tampere–Finland developed a thin foamed polymeric material for capacitive sensors. Such soft-voided films exhibited electrical charging characteristics, forming a powerful combination, which resulted in a smart-material with ferroelectric properties. The discovery of the electro-thermo mechanical film (ETMF) has sparked the curiosity of the electret community, leading to the development of several studies. At that time, ETMF became known as cellular electrets and, later, as ferroelectrets or piezoelectrets regarding their electromechanical properties. This paper provides a timeline review of the research on ferroelectrets produced in Brazil, between the years 1990 and 2020, towards demonstrating how the interest in the electret electrical charging mechanism has resulted in the use of ferroelectrets with well-controlled cavities for ultrasound applications..
Journal of Advanced Dielectrics
- Publication Date: Jan. 01, 1900
- Vol. 13, Issue 4, 2341007 (2023)
Resonance phenomena in dielectric media: A review and comparison of acoustic and electromagnetic modes
Gunnar Gidion, Taimur Aftab, Leonhard M. Reindl, and Stefan J. Rupitsch
The theory and application of resonances and vibrational modes are part of the foundation of science. In this contribution, examples of acoustical resonators are highlighted, and compared to electromagnetic modes. As an example from architecture, we describe the phenomenon of whispering galleries; such modes are nowadaThe theory and application of resonances and vibrational modes are part of the foundation of science. In this contribution, examples of acoustical resonators are highlighted, and compared to electromagnetic modes. As an example from architecture, we describe the phenomenon of whispering galleries; such modes are nowadays known in dielectric and optical resonators. A specimen of a semicircular whispering bench in Park Sanssouci in Potsdam is acoustically investigated and demonstrated to show low losses for sound propagation. A special acoustical bug is discussed which was used for the espionage of the U.S. ambassador in Moscow. The Sovyets could interrogate this passive device by radio waves. Its working principle was based on the electromagnetic resonance of the cavity that the sound-sensitive membrane was part of. The underlying relation between excitation and resonance is compared to the sound production in flue organ pipes. A stopped flue organ pipe was investigated using a piezoelectric film sensor inside the pipe body. The results show that even-numbered modes, which are usually suppressed in the radiated sound of a stopped pipe, are still present in the vibrations inside the resonator..
Journal of Advanced Dielectrics
- Publication Date: Jan. 01, 1900
- Vol. 13, Issue 4, 2341008 (2023)
Ferroelectrets: Heterogenous polymer electrets with high piezoelectric sensitivity for transducers
Xunlin Qiu, Peng Fang, Axel Mellinger, Ruy Alberto Pisani Altafim, Werner Wirges, Gunnar Gidion, and Dmitry Rychkov
Nowadays, the demand for advanced functional materials in transducer technology is growing rapidly. Piezoelectric materials transform mechanical variables (displacement or force) into electrical signals (charge or voltage) and vice versa. They are interesting from both fundamental and application points of view. FerrooNowadays, the demand for advanced functional materials in transducer technology is growing rapidly. Piezoelectric materials transform mechanical variables (displacement or force) into electrical signals (charge or voltage) and vice versa. They are interesting from both fundamental and application points of view. Ferrooelectrets (also called piezoelectrets) are a relatively young group of piezo-, pyro- and ferroelectric materials. They exhibit ferroic behavior phenomenologically undistinguishable from that of traditional ferroelectrics, although the materials per se are essentially non-polar space-charge electrets with artificial macroscopic dipoles (i.e., internally charged cavities). A lot of work has been done on ferroelectrets and their applications up to now. In this paper, we review and discuss mostly the work done at University of Potsdam on the research and development of ferroelectrets. We will, however, also mention important results from other teams, and prospect the challenges and future progress trend of the field of ferroelectret research..
Journal of Advanced Dielectrics
- Publication Date: Jan. 01, 1900
- Vol. 13, Issue 4, 2341009 (2023)
Impedance spectra of different capacitor technologies
René Kalbitz
This paper reviews the interpretation of impedance and capacitance spectra for different capacitor technologies and discusses how basic electrical characteristics can be inferred from them. The basis of the interpretation is the equivalent circuit for capacitors. It is demonstrated how the model parameters, such as capThis paper reviews the interpretation of impedance and capacitance spectra for different capacitor technologies and discusses how basic electrical characteristics can be inferred from them. The basis of the interpretation is the equivalent circuit for capacitors. It is demonstrated how the model parameters, such as capacitance and equivalent series resistance, can be extracted from the measured spectra. The aspects of measurement accuracy are exemplarily discussed on the measured spectra..
Journal of Advanced Dielectrics
- Publication Date: Jan. 01, 1900
- Vol. 13, Issue 4, 2341010 (2023)
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