Effect of Mn-doping on optical properties of lead-free (K0.4Na0.6)NbO3 ferroelectric single crystals |
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| Affiliation: | 1. Key Laboratory of Optoelectronic Material and Device, Shanghai Normal University, Shanghai, 200234, China;2. Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 201800, China;1. School of Materials Science and Engineering, Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering, Jiangsu Province Cultivation Base for State Key Laboratory of Photovoltaic Science and Technology, National Experimental Demonstration Center for Materials Science and Engineering, Changzhou University, Changzhou 213164, China;2. Key Laboratory of Optoelectronic Material and Device, Department of Physics, Shanghai Normal University, Shanghai 200234, China;3. School of Material Science and Engineering, Jiangsu University, Zhenjiang 212013, China;4. Key Laboratory of Inorganic Function Material and Device, Chinese Academy of Sciences, Shanghai 201800, China;1. Functional Ceramics Department, Powder & Ceramics Division, Korea Institute of Materials Science (KIMS), Changwon, Gyeongnam, 641-831, Republic of Korea;2. School of Materials Science and Engineering, Kumoh National Institute of Technology, 61 Daehak-ro, Gumi, Gyeongbuk, 39177, Republic of Korea;3. Department of Materials Science and Engineering, Pusan National University, Busan, 46241, Republic of Korea;4. Department of Materials Science and Engineering, Korea University, Seongbuk-gu, Seoul, Republic of Korea;1. Smart Materials Research Laboratory, Department of Physics, Indian Institute of Technology Roorkee, Roorkee 247667, India;2. Metallurgical and Materials Engineering Department, Indian Institute of Technology Roorkee, Roorkee 247667, India;1. Key Laboratory for Macromolecular Science of Shaanxi Province, Shaanxi Key Laboratory for Advanced Energy Devices, Shaanxi Engineering Laboratory for Advanced Energy Technology, School of Materials Science and Engineering, Shaanxi Normal University, Xi’an, 710062, Shaanxi, China;2. School of Materials Science and Engineering, Xi’an University of Technology, Xi’an, 710048, Shaanxi, China;3. School of Physics and Information Technology, Shaanxi Normal University, Xi’an, 710062, Shaanxi, China |
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| Abstract: | Optical properties of <001>-oriented pure (K0.4Na0.6)NbO3 (KNN) and 0.5 wt% Mn-doped KNN (Mn-KNN) single crystals were studied. The refractive indices (n) of both crystals exhibited a normal dispersion behavior in the wavelength range of 300−1100 nm. The modified Sellmeier dispersion equations for n were obtained by least-squares fit. In addition, Sellmeier coefficients were determined by single-oscillator dispersion relation, which related to energy band structures of crystals. Compared with KNN, a decrease about 10 % in transmittance (over 350 nm) was observed in Mn-KNN due to the losses resulting from the increase of domain wall density. Furthermore, a 20 nm blue-shift in the absorption edge was observed for Mn-KNN. Based on Tauc equation, the band gap energies of 3.26 and 3.42 eV were obtained for KNN and Mn-KNN, respectively. The increase of band gap energy in Mn-KNN was attributed to the distortion of BO6 octahedron building block caused by Mn2+ occupying the B-site. |
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| Keywords: | KNN single crystals Mn-doping Optical properties Band gap energy |
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