BROWSE

Related Researcher

Author's Photo

Jo, Wook
Sustainable Functional Ceramics Lab
Research Interests
  • Lead-free piezoceramics, ultra - low temperature sintering, ferroelectrics, relaxor ferroelectrics, 2D materials, magnetoelectric materials, multiferroics

ITEM VIEW & DOWNLOAD

Temperature-Dependent Properties of (Bi1/2Na1/2)TiO3-(Bi1/2K1/2)TiO3-SrTiO3 Lead-Free Piezoceramics

Cited 53 times inthomson ciCited 40 times inthomson ci
Title
Temperature-Dependent Properties of (Bi1/2Na1/2)TiO3-(Bi1/2K1/2)TiO3-SrTiO3 Lead-Free Piezoceramics
Author
Wang, KeHussain, AliJo, WookRoedel, Juergen
Keywords
Base composition; Chemical modifiers; Depolarization temperature; Dielectric permittivities; Driving field; Ergodics; Ferroelectric and piezoelectric properties; Field-induced; Large strains; Lead free piezoceramics; Lead-free piezoelectric materials; Model system; Poled sample; Relaxors; Room temperature; SrTiO; Temperature-dependent measurements; Temperature-dependent properties; Thermally stimulated depolarization currents; TiO
Issue Date
2012-07
Publisher
WILEY-BLACKWELL
Citation
JOURNAL OF THE AMERICAN CERAMIC SOCIETY, v.95, no.7, pp.2241 - 2247
Abstract
Ferroelectric and piezoelectric properties of SrTiO3modified (0, 3, and 5 mol%) 0.8Bi1/2Na1/2TiO30.2Bi1/2K1/2TiO3 lead-free piezoceramics were investigated as a model system in an attempt to lay a guideline for developing lead-free piezoelectric materials with large strains. Two guidelines, one for the choice of base composition and the other for the choice of chemical modifiers, were assumed from our current understanding of the mechanism involved. Dielectric permittivity of both poled and unpoled samples was measured and compared, leading to a conclusion that the frequency-independent anomaly (TF-R) is the temperature at which induced-ferroelectric order converts back to relaxor state. The correlation between TF-R and depolarization temperature (Td) was shown by the comparison with Td determined by thermally stimulated depolarization current measurements, whereas the ferroelectric-relaxor transition temperature TF-R was determined using poled samples. A large unipolar strain of 0.36% (Smax/Emax = 600 pm/V) at a driving field of 6 kV/mm was obtained at room temperature for a SrTiO3 content of 5 mol%. Temperature-dependent measurements of both polarization and strain from room temperature to 200 degrees C revealed that the origin of the large strain is due to a reversible field-induced ergodic relaxor-to-ferroelectric phase transformation.
URI
Go to Link
DOI
10.1111/j.1551-2916.2012.05162.x
ISSN
0002-7820
Appears in Collections:
MSE_Journal Papers
Files in This Item:
2-s2.0-84863723157.pdf Download

find_unist can give you direct access to the published full text of this article. (UNISTARs only)

Show full item record

qrcode

  • mendeley

    citeulike

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

MENU