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Sharp low frequency dissipative effects in tetragonal ceramics
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10.1063/1.3283920
/content/aip/journal/jap/107/2/10.1063/1.3283920
http://aip.metastore.ingenta.com/content/aip/journal/jap/107/2/10.1063/1.3283920
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Subsequent mechanical responses in bending (damping ; Young’s modulus ) (left column) and in torsion (damping ; shear modulus ) (right column) at after (a) aging and after (b) aging.

Image of FIG. 2.
FIG. 2.

Subsequent mechanical responses in bending (damping ; Young’s modulus ) (left column) and in torsion (damping ; shear modulus ) (right column) at after (a) aging and after (b) aging.

Image of FIG. 3.
FIG. 3.

(a) Oxygen octahedron in a tetragonal barium titanate unit cell. has two kinds of nonequivalent sites of or and . In the cubic phase (above the Curie point), the distances between and or and sites are the same. In the tetragonal phase (below the Curie point), the distances between and or and sites are as shown in Ref. 7. (b) Presents an 180° domain. After aging at , is generated, and are aligned in the same direction, . After aging at , is not generated because the material is above the Curie point. Defects then possess cubic symmetry and there is no interaction between and . (c) When transverse tensional stress is applied on this 180° domain, will align with respect to due to breaking of crystal symmetry giving rise to a restoring stress between and .

Image of FIG. 4.
FIG. 4.

Normalized natural frequency for radial vibrations (frequency ratio) and damping based on radiation of sound from a vibrating inclusion vs (a) inclusion Poisson's ratio and vs (b) the ratio of inclusion bulk modulus to shear modulus.

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/content/aip/journal/jap/107/2/10.1063/1.3283920
2010-01-26
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Sharp low frequency dissipative effects in tetragonal BaTiO3 ceramics
http://aip.metastore.ingenta.com/content/aip/journal/jap/107/2/10.1063/1.3283920
10.1063/1.3283920
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