Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 30, Issue 2, Pages 301-306Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2009.05.050
Keywords
Dielectric properties; Ferroelectric properties; Grain growth; Piezoelectric properties; Single crystal
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Na0.5K0.5NbO3 (NKN) and Mn-doped NKN crystals, which are one of the promising candidates of lead-free piezoelectric materials, were grown by using a floating zone (FZ) method. The resulting crystal growth was compared with crystal growth that resulted from using a flux method in a previous study. In the crystal grown by FZ method under where the growth rate was controlled to 3 mm/h, thin layers formed parallel and perpendicular directions to the growth direction. In the crystal grown by FZ method, the crystal structure could not be classified as having the orthorhombic lattice of Amm2, which was observed in the crystal grown using a flux method. It was found that doped Mn was substituted in the perovskite-type lattice of NKN. Pure NKN crystals showed 90 degrees domains that had a zig-zag shape, whereas Mn-doped NKN crystals were aligned to the domain layers in straight lines. It was confirmed that Mn-doped NKN crystal showed a square P-E hysteresis loop. (C) 2009 Elsevier Ltd. All rights reserved.
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