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Various cubic-based polymorphic phase boundary structures in (1-y)(Na0.5K0.5)(Nb1-xSbx)-yCaTiO(3) ceramics and their piezoelectric properties

Authors
Lee, Tae-GonCho, Sung-HoonKim, Dae-HyeonHwang, Hyun-GyuLee, Ku-TakHong, Chang-HyoHong, Youn-WooChae, Keun HwaChoi, Ji-WonKim, Jeong-SeogNahm, Sahn
Issue Date
4월-2019
Publisher
ELSEVIER SCI LTD
Keywords
(Na,K)(Nb,Sb)-CaTiO3 piezoelectric ceramics; Cubic-based polymorphic phase boundary structure; Electric-field-induced strain; Temperature stability of the piezoelectric properties
Citation
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, v.39, no.4, pp.973 - 985
Indexed
SCIE
SCOPUS
Journal Title
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume
39
Number
4
Start Page
973
End Page
985
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/66488
DOI
10.1016/j.jeurceramsoc.2018.12.025
ISSN
0955-2219
Abstract
CuO-added (1-y)(Na0.5K0.5)(Nb1-xSbx)-yCaTiO(3) ceramics with 0.0 <= x <= 0.1 and 0.04 <= y <= 0.055 were sintered at 970 degrees C. Various cubic-based polymorphic-phase-boundary (PPB) structures were formed: orthorhombic-tetragonal-cubic, and tetragonal-cubic PPB structures. The crystal structure of the specimens near Curie temperature is a mixture of Pm3m cubic and P4mm tetragonal structures and these ceramics showed ferroelectric properties. A schematic phase diagram of these ceramics has been suggested. The piezoelectric properties of these specimens were influenced by their crystal structure. All the specimens are expected to have good fatigue properties. In particular, the specimen with a tetragonal-cubic PPB structure (x = 0.04 and y = 0.045) has a large d(33) of 338 pC/N and a high strain of 0.17% at 4.5 kV/mm. This specimen has good temperature stability; a d(33) value of 300 pC/N and strain of approximately 0.12% were obtained at 175 degrees C, indicating that this specimen is a good candidate for use as a piezoelectric multilayer actuator.
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