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Crystal structure and ferroelectric properties of Mn-doped ((Ka0.5Na0.5)0.935Li0.065)NbO3 lead-free ceramics |
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| Authors: | S Wongsaenmai K Kanchiang S ChandarakY Laosiritaworn S RujirawatR Yimnirun |
| Institution: | a Program in Materials Science, Faculty of Science, Maejo University, Chiang Mai 50290, Thailand b Department of Physics & Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai, Thailand c School of Ceramic Engineering, Institute of Engineering, Suranaree University of Technology, Nakhon Ratchasima, Thailand d School of Physics, Institute of Science, Suranaree University of Technology, and Synchrotron Light Research Institute (Public Organization), Nakhon Ratchasima, Thailand e Thailand Center of Excellence in Physics (ThEP), Commission on Higher Education, Bangkok 10400, Thailand |
| Abstract: | In this study, ceramics in Mn-doped ((Ka0.5Na0.5)0.935Li0.065)NbO3 ceramics (Mn content = 0.25, 0.50, 1.00 and 1.50 mol%) were successfully prepared by the conventional mixed-oxide technique. The crystal structure was identified by XRD as a single-phase perovskite structure with tetragonal symmetry. The valence of Mn ions, characterized by the synchrotron XAS technique, was seen to change from Mn4+ to Mn3+ during the formation of the crystal. The valence state of Mn strongly affected the crystal structure and ferroelectric properties of the ceramics. The ferroelectric parameters show the decrease of remnant polarization and the increase of the coercive field with increasing MnO2 content. The results confirm the Mn3+ in KNNL perovskite lattices, leading to the formation of oxygen vacancies and hardening effects. |
| Keywords: | Lead-free ceramics KNNL Ferroelectric properties Synchrotron XANES |
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