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1 Nov 2010

Volume 97, Issue 18, Articles (18xxxx)

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Appl. Phys. Lett. 97, 183105 (2010); http://dx.doi.org/10.1063/1.3506485 (3 pages)

Z. H. Zhang, X. Q. Deng, X. Q. Tan, M. Qiu, and J. B. Pan
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Stability of terbium scandate on Si(100)

M. Copel, N. Bojarczuk, L. F. Edge, and S. Guha

Appl. Phys. Lett. 97, 182901 (2010); http://dx.doi.org/10.1063/1.3513314 (3 pages) | Cited 3 times

Online Publication Date: 3 November 2010

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We have examined the stability of TbScO3 on Si(100) using medium energy ion scattering. At high temperatures the dielectric decomposes into a Tb-rich silicate layer near the substrate, and a Sc-rich layer near the surface. Interfacial SiO2 is consumed in the reaction. We find that Sc2O3 by itself does not react with SiO2 while Tb2O3 readily forms a silicate. This difference in reactivity drives the vertical separation of metal ions. Consideration of the fundamental chemistry of rare-earth scandates suggests that rare-earth scandates are unstable in the presence of SiO2
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79.20.Rf Atomic, molecular, and ion beam impact and interactions with surfaces
68.49.Sf Ion scattering from surfaces (charge transfer, sputtering, SIMS)
82.30.-b Specific chemical reactions; reaction mechanisms

Effect of intensive and extensive loss factors on the dynamic response of magnetoelectric laminates

Kyung-Hoon Cho, Chee-Sung Park, and Shashank Priya

Appl. Phys. Lett. 97, 182902 (2010); http://dx.doi.org/10.1063/1.3511285 (3 pages) | Cited 4 times

Online Publication Date: 3 November 2010

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We report the correlation between intensive and extensive losses in piezoelectric materials with the frequency dependent response of layered magnetoelectric (ME) composites. Three different piezoelectric compositions were synthesized to achieve varying loss characteristics allowing a systematic interpretation of changes in ME coupling in terms of loss components. We clearly demonstrate that intensive dielectric and piezoelectric loss play an important role in controlling the ME sensitivity of layered composites in sub-resonance low frequency range while extensive mechanical loss is dominant factor at resonance condition. Further, the maximum in ME response is obtained at antiresonance frequency of piezoelectrics.
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75.85.+t Magnetoelectric effects, multiferroics
77.84.-s Dielectric, piezoelectric, ferroelectric, and antiferroelectric materials
77.22.Gm Dielectric loss and relaxation

Percolative properties in ferroelectric-dielectric composite ceramics

Qiwei Zhang, Jiwei Zhai, Lingbing Kong, and Xi Yao

Appl. Phys. Lett. 97, 182903 (2010); http://dx.doi.org/10.1063/1.3514246 (3 pages) | Cited 2 times

Online Publication Date: 4 November 2010

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Percolative properties in dielectric (DE) tunability were observed in three ferroelectric (FE)-DE composite ceramics as follows: xBa0.5Sr0.5TiO3–MgO, xBa0.4Sr0.6TiO3–Mg2TiO4, and xBa0.5Sr0.5TiO3–Mg3B2O6. Dielectric constants of the composites increased monotonously with increasing volume fractions of FE component. Comparatively, their DE tunabilities exhibited a weak dependence on FE concentrations over a wide range. However, their tunabilities started to decrease substantially below a critical concentration of FE. The critical concentrations were 40 vol % for Ba0.5Sr0.5TiO3–MgO, 38 vol % for Ba0.4Sr0.6TiO3–Mg2TiO4, and 33 vol % for Ba0.5Sr0.5TiO3–Mg3B2O6. These results could be used as a guide to tailor the properties of FE-DE composites for tunable device applications.
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81.05.Je Ceramics and refractories (including borides, carbides, hydrides, nitrides, oxides, and silicides)
77.84.Lf Composite materials
77.22.Ch Permittivity (dielectric function)
77.65.Fs Electromechanical resonance; quartz resonators
77.22.Gm Dielectric loss and relaxation
77.80.-e Ferroelectricity and antiferroelectricity
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