Journal ArticleDOI
Connectivity and piezoelectric-pyroelectric composites
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TLDR
In this article, a series and parallel model for composite piezoelectric and pyroelectrics is presented, which leads to several interesting results, such as a diphasic pyroelectric in which neither phase is pyrocharged.About:
This article is published in Materials Research Bulletin.The article was published on 1978-05-01. It has received 1706 citations till now.read more
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Revival of the Magnetoelectric Effect
Abstract: Recent research activities on the linear magnetoelectric (ME) effect?induction of magnetization by an electric field or of polarization by a magnetic field?are reviewed. Beginning with a brief summary of the history of the ME effect since its prediction in 1894, the paper focuses on the present revival of the effect. Two major sources for 'large' ME effects are identified. (i) In composite materials the ME effect is generated as a product property of a magnetostrictive and a piezoelectric compound. A linear ME polarization is induced by a weak ac magnetic field oscillating in the presence of a strong dc bias field. The ME effect is large if the ME coefficient coupling the magnetic and electric fields is large. Experiments on sintered granular composites and on laminated layers of the constituents as well as theories on the interaction between the constituents are described. In the vicinity of electromechanical resonances a ME voltage coefficient of up to 90?V?cm?1?Oe?1 is achieved, which exceeds the ME response of single-phase compounds by 3?5 orders of magnitude. Microwave devices, sensors, transducers and heterogeneous read/write devices are among the suggested technical implementations of the composite ME effect. (ii) In multiferroics the internal magnetic and/or electric fields are enhanced by the presence of multiple long-range ordering. The ME effect is strong enough to trigger magnetic or electrical phase transitions. ME effects in multiferroics are thus 'large' if the corresponding contribution to the free energy is large. Clamped ME switching of electrical and magnetic domains, ferroelectric reorientation induced by applied magnetic fields and induction of ferromagnetic ordering in applied electric fields were observed. Mechanisms favouring multiferroicity are summarized, and multiferroics in reduced dimensions are discussed. In addition to composites and multiferroics, novel and exotic manifestations of ME behaviour are investigated. This includes (i) optical second harmonic generation as a tool to study magnetic, electrical and ME properties in one setup and with access to domain structures; (ii) ME effects in colossal magnetoresistive manganites, superconductors and phosphates of the LiMPO4 type; (iii) the concept of the toroidal moment as manifestation of a ME dipole moment; (iv) pronounced ME effects in photonic crystals with a possibility of electromagnetic unidirectionality. The review concludes with a summary and an outlook to the future development of magnetoelectrics research.
Journal ArticleDOI
Multiferroic magnetoelectric composites: Historical perspective, status, and future directions
TL;DR: In this article, a review of mostly recent activities can be found, with a brief summary of the historical perspective of the multiferroic magnetoelectric composites since its appearance in 1972.
Journal ArticleDOI
Fundamentals, processes and applications of high-permittivity polymer–matrix composites
Zhi-Min Dang,Zhi-Min Dang,Zhi-Min Dang,Jinkai Yuan,Jun-Wei Zha,Tao Zhou,Shengtao Li,Guo-Hua Hu,Guo-Hua Hu +8 more
TL;DR: In this paper, the authors focus on the important role and challenges of high-k polymer-matrix composites (PMC) in new technologies and discuss potential applications of highk PMC.
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Electrical Resistivity of Composites
TL;DR: In this paper, a general effective media (GEM) equation, which combines most aspects of both percolation and effective media theories, is introduced, and the GEM equation quantitatively fits electrical resistivity (conductivity) as a function of the volume fraction data for binary composites.
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Powering MEMS portable devices—a review of non-regenerative and regenerative power supply systems with special emphasis on piezoelectric energy harvesting systems
TL;DR: In this article, the authors provide an overview of strategies for powering MEMS via non-regenerative and regenerative power supplies, along with recent advancements, and discuss future trends and applications for piezoelectric energy harvesting technology.
References
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Book
Physical properties of crystals
TL;DR: In this paper, the physical properties of crystals systematically in tensor notation are presented, presenting tensor properties in terms of their common mathematical basis and the thermodynamic relations between them.
Journal ArticleDOI
Physical Properties of Crystals. By J. F. Nye . Pp. xv, 322, 50s. 1957. (Oxford: Clarendon Press)
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An in situ grown eutectic magnetoelectric composite material: Part I Composition and unidirectional solidification
Journal ArticleDOI
An in situ grown eutectic magnetoelectric composite material
TL;DR: In this article, a composite material with the mixed spinel cobalt ferrite-cobalt titanate and the perovskite barium titanate as coexisting phases has been prepared.
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