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Bi-templated grain growth maximizing the effects of texture on piezoelectricity

Authors
Kang, Woo-SeokLee, Tae-GonKang, Joo-HeeLee, Ju-HyeonChoi, GanghoKim, Sun-WooNahm, SahnJo, Wook
Issue Date
4월-2021
Publisher
ELSEVIER SCI LTD
Keywords
Templated grain growth; Piezoceramics; Electromechanical strains
Citation
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, v.41, no.4, pp.2482 - 2487
Indexed
SCIE
SCOPUS
Journal Title
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume
41
Number
4
Start Page
2482
End Page
2487
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/49440
DOI
10.1016/j.jeurceramsoc.2020.12.028
ISSN
0955-2219
Abstract
Templated grain growth is beneficial for piezoelectric materials, the properties of which become the best in their single crystalline form. Nevertheless, a textured ceramic prepared by a templated grain growth technique often fails in exhibiting as good properties as expected in single crystals even with a high degree of orientation factor. Here, we propose a new strategy for maximizing texturing effect by suppressing the growth of untextured matrix grains. The textured ceramics made by our method, so-called bi-templated grain growth, are featured by ultrahigh piezoelectric properties (d(33)=-1,031 pC/N, d.g=-59,000, k(p)=-0.76). A special emphasis is on the achieved electric-field-induced strain of 0.13 % at 1 kV/mm, which is as high as that of single crystals. This work demonstrates that not only the degree of texture but also the coarsening of untextured matrix grains should be well-controlled to best exploit the templated grain growth technique.
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