Crystal structure and orthorhombic–tetragonal phase transition of nanoscale (Li0.06Na0.47K0.47)NbO3 |
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| Authors: | Chao Wang Yu-Dong Hou Hai-Yan Ge Man-Kang Zhu Hui Yan |
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| Affiliation: | 1. Human Resources Development Section, Raja Ramanna Centre for Advanced Technology, Indore 452013, India;2. Homi Bhabha National Institute, Anushakti Nagar, Mumbai 400094, India;1. Integrated Nanotechnology Research Center (INRC), Khon Kaen University, Khon Kaen, 40002 Thailand;2. School of General Science, Faculty of Liberal Arts, Rajamangala University of Technology Rattanakosin, Wang Klai Kangwon Campus, 77110, Thailand;1. Laboratory of Functional Materials, College of Chemistry, Chongqing Normal University, Chongqing 401331, China;2. Sichuan University of Arts and Science, Dazhou 63500, China;1. National Engineering Research Center of Electromagnetic Radiation Control Materials, University of Electronic Science and Technology of China, Chengdu, China, 610054;2. Key Laboratory of Multi-Spectral Absorbing Materials and Structures of Ministry of Education, University of Electronic Science and Technology of China, Chengdu, China, 610054 |
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| Abstract: | Lead-free nano (Li0.06Na0.47K0.47)NbO3 powders, with pure perovskite structure and various grain sizes between about 30 and 60 nm, have been successfully synthesized by a novel sol–gel method, in which Nb2O5 was used as the Nb source. The refining XRD and Raman spectra were used in combination with TEM to investigate the evolution of lattice structure and phase transformation behavior as a function of grain size. The results demonstrated that the growth process of grains has been divided into two stages, and the distortion of unit cell apparently decreases with decreasing grain size. At around 35 nm, the phase structure of (Li0.06Na0.47K0.47)NbO3 changed from orthorhombic to tetragonal. This phenomenon is related to a grain size-induced structural phase transition. For the well accepted wisdom that niobates get super piezoelectric properties in orthorhombic–tetragonal transition region, our results suggested a critical size for the application of (Li0.06Na0.47K0.47)NbO3 in nano piezoelectric devices. |
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