TITLE

Grain-boundary and crack effects on the dielectric response of high-permittivity films and ceramics

AUTHOR(S)
Rychetský, I.; Petzelt, J.; Ostapchuk, T.
PUB. DATE
November 2002
SOURCE
Applied Physics Letters;11/25/2002, Vol. 81 Issue 22, p4224
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Grain-boundary and crack effects on the dielectric response of high-permittivity films and ceramics were analyzed using the generalized effective-medium approximation. It was demonstrated that the brick-wall and coated spheres models, which become equivalent for a small porosity, best describe the strong reduction of the dielectric response and hardening of the soft-mode frequency recently revealed in SrTiO[SUB3] films and PbZrO[SUB3] ceramics.
ACCESSION #
8528074

 

Related Articles

  • Dielectric abnormities in BaTi0.9(Ni1/2W1/2)0.1O3 giant dielectric constant ceramics. Zhao, Fei; Yue, Zhenxing; Pei, Jing; Yang, Donghai; Gui, Zhilun; Li, Longtu // Applied Physics Letters;7/30/2007, Vol. 91 Issue 5, p052903 

    BaTi0.9(Ni1/2W1/2)0.1O3 ceramics were fabricated and their dielectric properties were investigated. With the sintering temperature increasing from 1250 to 1280 °C, the grain size abruptly increases from 1–2 to 20–40 μm, accompanying significant changes in dielectric response....

  • UNDERSTANDING EVOLUTION. Sheppard, Laurel M. // Ceramic Industry;Jun2000, Vol. 150 Issue 6, p45 

    Outlines presentations on ceramic grain boundary engineering at a workshop sponsored by the Japan Fine Ceramics Center in March 2000, in Nagoya, Japan. Importance of the design of appropriate grain boundary interfaces to the future of advanced ceramics; Use of molecular dynamics simulations to...

  • Study on the electrical properties of single grain boundaries in BaTiO3 ceramics. Feng, Zhang; Zechun, Cao // Journal of Applied Physics;7/15/1996, Vol. 80 Issue 2, p1033 

    Focuses on a study which investigated the electrical properties of single grains and single grain boundaries in donor doped BaTiO[sub3] ceramics. Experimental procedures; Results and discussion; Conclusions.

  • The effects of donor dopant concentration on the grain boundary layer characteristics in n-doped BaTiO3 ceramics. Al-Allak, H. M.; Illingsworth, J.; Brinkman, A. W.; Russell, G. J.; Woods, J. // Journal of Applied Physics;12/1/1988, Vol. 64 Issue 11, p6477 

    Presents a study that investigated the effects of donor dopant concentration on the grain boundary layer characteristics in n-doped ceramics. Method of the study; Results and discussion; Conclusion.

  • Polarization switching of ferroelectric ceramics with grain boundary effect: A simple continuum model. Kim, Sang-Joo // Journal of Applied Physics;9/1/2002, Vol. 92 Issue 5, p2668 

    A one-dimensional continuum model is proposed to simulate the polarization switching of ferroelectric ceramics and investigate the effects of the presence of grain boundaries on the switching behavior. A ceramic bar is modeled as a composite system of grains and grain boundaries. A grain element...

  • Ferroelectric state analysis in grain boundary of Na[sub 0.85]Li[sub 0.15]NbO[sub 3] ceramic. Nobre, M. A. L.; Lanfredi, S. // Journal of Applied Physics;5/1/2003, Vol. 93 Issue 9, p5557 

    The electric and dielectric properties of the grain boundary of Na[sub 0.85]Li[sub 0.15]NbO[sub 3] lead-free ferroelectric-semiconductor perovskite were investigated. The impedance spectroscopy was carried out as a function of a thermal cycle. The sodium lithium niobate was synthesized by a...

  • Effect of lithium additive on the microstructure and electrical responses of 0.9PMN—0.1PT ceramics. Cavalheiro, Alberto Adriano; Bruno, Juliana C.; Zaghete, Maria A.; Varela, José A. // Journal of Materials Science;Feb2007, Vol. 42 Issue 3, p828 

    Structural effects of lithium additive on 0.9PMN–0.1PT powders prepared by Ti-modified columbite route were studied. The substitution of Li+ ions for Mg2+ ions in the B-site sub-lattice of 0.9PMN–0.1PT perovskite structure was explained in terms of lead and oxygen vacancies...

  • Grain-boundary-controlled impedances of electroceramics: Generalized effective-medium approach and brick-layer model. Nan, Ce Wen; Zhou, Xisong; Nan, Jun; Wu, Junbo // Journal of Applied Physics;4/1/2001, Vol. 89 Issue 7 

    In every electroceramic there exist variations throughout the microstructure of both grain size (and shape) and electrical properties of individual grain boundaries. To calculate the effects of such microstructural variations on the frequency-dependent impedance/dielectric behavior, we describe...

  • Modeling of ceramic microstructures: Dynamic damage initiation and evolution. Espinosa, Horacio D.; Zavattieri, Pablo D. // AIP Conference Proceedings;2000, Vol. 505 Issue 1, p333 

    A model is presented for the dynamic finite element analysis of ceramic microstructures subjected to multi-axial dynamic loading. This model solves an initial-boundary value problem using a multi-body contact scheme integrated with interface elements to simulate microcracking at grain boundaries...

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics