Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 30, Issue 4, Pages 971-979Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2009.10.006
Keywords
Na0.5Bi0.5TiO3-K0.5Bi0.5TiO3; Sintering; Microstructure; Morphotropic phase boundary (MPB); Electrical properties
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Funding
- Ministry of Higher Education, Science and Technology of the Republic of Slovenia [1000-07-310059]
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We have investigated the Na0.5Bi0.5TiO3-K0.5Bi0.5TiO3 (NBT-KBT) system, with its complex perovskite structure, as a promising material for piezoelectric applications. The NBT-KBT samples were synthesized using a solid-state reaction method and characterized with XRD and SEM. Room-temperature XRD showed a gradual change in the crystal structure from tetragonal in the KBT to rhombohedral in the NBT, with the presence of an intermediate morphotropic region in the samples with a compositional fraction x between 0.17 and 0.25. The fitted perovskite lattice parameters confirmed an increase in the size of the crystal lattice from NBT towards KBT, which coincides with an increase in the ionic radii. Electrical measurements on the samples showed that the maximum values of the dielectric constant, the remanent polarization and the piezoelectric coefficient are reached at the morphotropic phase boundary (MPB) (epsilon = 1140 at 1 MHz; P-r = 40 mu C/cm(2); d(33) = 134 pC/N). (C) 2009 Elsevier Ltd. All rights reserved.
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