Publication Date:
2019
Description:
Grain‐textured PMN‐PT ceramics were produced by templated grain growth and the symmetry of the textured samples was evaluated by pole figure analysis. Shown in the following figure parts are: (A) templated grain growth model, (B) micrograph of textured PMN‐PT, (C) 3D pole figure showing twofold symmetry and (D) 3D pole figure showing 2m orthotropic symmetry for a unique domain‐engineered condition. Inset shows 2D pole figures.
Abstract
We have performed studies of the orientation distribution in 〈001〉C textured, 0.03(Na1/2Bi1/2)TiO3 ‐ 0.97[0.715Pb(Mg1/3Nb2/3)TiO3 ‐ 0.285PbTiO3] (0.03NBT‐0.97[PMN‐28.5PT]) ceramics by a pole figure method, comparing the results to those for PMN‐PT single crystal and polycrystal samples. The pole figures about the (001) zone are found to have monoclinic, Ma, phase for textured ceramics in the annealed condition and were similar to those for electrically poled single crystals. However, electrical poling of the textured ceramics resulted in a doublet splitting of the orientation distribution about the direction that defined the original grain texturing. Studies of pole figures about other high‐symmetry zones also revealed the development of some degree of preferred orientation along the in‐plane directions after poling. Our findings demonstrate that E‐field induced phase transformation and domain textures superimpose with that of preferred grain orientations, giving rise to a unique texture symmetry for PMN‐PT. The texture symmetry changes are driven by minimization of the elastic strain energy, and have an important effect upon the piezoelectric properties.
Print ISSN:
0002-7820
Electronic ISSN:
1551-2916
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
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