Relaxor behavior and ferroelectric properties of a new Ba4SmFe0.5Nb9.5O30 tungsten bronze ceramic |
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| Affiliation: | 1. Department of Materials Science & Engineering, Hoseo University, Asan, Chungnam 336-795, Republic of Korea;2. Department of Digital Display Engineering, Hoseo University, 336-795, Republic of Korea;1. School of Physics and Electronic Engineering, Yibin University, Yibin, Sichuan 644007, China;2. Institute of Physics, Yibin University, Yibin Sichuan 644007, China;1. Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, 350002, China;2. University of Chinese Academy of Sciences, Beijing, 100049, China;3. State Key Laboratory of Structural Chemistry, Fuzhou, 350002, China;1. PG Department of Physics, GVM Girls College, Sonepat 131001, India;2. Department of Physics, Hindu College, Sonepat 131001, India;3. Solid State Physics Laboratory, Lucknow Road, Delhi 11054, India;4. Department of Physics, GVM Girls College, Sonepat 131001, India;5. School of Physics & Materials Science, Thapar University, Patiala 147004, India;1. College of Material Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, PR China;2. Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin 541004, PR China;3. Institute of Physics, Chinese Academy of Sciences, Beijing 100190, PR China |
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| Abstract: | Unfilled tungsten bronze ceramics with a composition of Ba4SmFe0.5Nb9.5O30 were prepared by the conventional solid-state sintering method. The phase, microstructure, dielectric and ferroelectric properties were studied. Room temperature XRD results indicated that the ceramic occurs in the tetragonal space group P4bm phase with cell parameters of a=b=12.4712(2) Å and c=3.9430(2) Å. The temperature-dependent dielectric properties, XRD data and Raman spectra data indicated that BSFN ceramics exhibit no phase changes from 35 °C to 450 °C. Fitting of a Vogel-Fulcher relationship with an activated energy Ea of 0.11 eV indicates an unambiguous dielectric relaxor state near room temperature. Furthermore, the BSFN ceramics exhibited residual polarization and coercive field of 3.45 µC/cm2 and 24.65 kV/cm, respectively. |
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| Keywords: | A Sintering B X-ray methods C Dielectric properties D Tungsten bronze |
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