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Anelastic anomalies and negative Poisson’s ratio in tetragonal ceramics
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) Anelastic anomalies at 0.1 Hz in damping and Young’s modulus outside the normal transformation windows in specimen I (aged at ). Responses in bending after aging at and in torsion after aging at are provided as comparison. (b) Bulk modulus and Poisson’s ratio calculated from a restricted set of points from (a). at 10 Hz (after aging at ) and 0.1 Hz are compared for specimen I. Strain applied is .

Image of FIG. 2.
FIG. 2.

Anelastic response (damping and Young’s modulus ): anomalies in specimen III at several frequencies (0.1, 1, and 10 Hz) at a strain of after aging at (a) 50 and (b) .

Image of FIG. 3.
FIG. 3.

Anelastic response (damping and Young’s modulus ) of specimen II (a) and specimen I (b) at a strain of at different frequencies after aging at . Results show the relaxation peaks in the damping curves.

Image of FIG. 4.
FIG. 4.

(a) Oxygen octahedron in tetragonal unit cell. has two kinds of nonequivalent sites or and . In cubic phase, the distances between and and sites are the same. In the tetragonal phase, distances between and and sites are given (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 shortly after temperature is reduced through the Curie point, and defects possess cubic symmetry. (c) When stress is applied, will align with respect to and leads to a restoring stress between and .


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Anelastic anomalies and negative Poisson’s ratio in tetragonal BaTiO3 ceramics