Journal
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
Volume 212, Issue -, Pages 1-6Publisher
ELSEVIER
DOI: 10.1016/j.mseb.2016.07.008
Keywords
KNN; Nanowires; MPB; Rhombohedral-tetragonal phase
Funding
- National Natural Science Foundation of China [51372055, 51321061]
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In this paper the K1-xNaxNbO3(KNN) nanostructures were synthesized by hydrothermal method using KNN gel powders as precursors. KNbO3-type orthorhombic KNN nanowires and perovskite KNN microfingers with a morphotropic phase boundary (MPB) between rhombohedral and tetragonal characterized by X-ray diffraction and Raman spectroscopy were obtained at 190 degrees C and 220 degrees C, respectively. KNbO3-type orthorhombic KNN nanowires had rectangular shape and the growth direction of these nanowires was [001]. The rhombohedral-tetragonal KNN microfingers were metastable, and changed the rhombohedral-tetragonal phase into the orthorhombic phase via thermal treatment at 600 degrees C then cooled down to room temperature. Sodium dodecyl sulfate (SDS) as surfactant was added to the hydrothermal reaction. It was found that SDS could improve the crystallinity of the rhombohedral-tetragonal K0.52Na0.48NbO3 and reduce the impurity effectively. The tetragonal-cubic phase transition temperature (Tc) of the rhombohedral-tetragonal powders appeared at 555 degrees C. (C) 2016 Elsevier B.V. All rights reserved.
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