Crystal structure,impedance and broadband dielectric spectra of ordered scheelite-structured Bi(Sc1/3Mo2/3)O4 ceramic |
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| Authors: | Di Zhou Li-Xia Pang Da-Wei Wang Huan-Huan Guo Fan Yang Ze-Ming Qi Chun Li Biao-Bing Jin Ian M Reaney |
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| Affiliation: | 1. Department of Materials Science and Engineering, University of Sheffield, S1 3JD, UK;2. Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education & International Center for Dielectric Research, Xi’an Jiaotong University, Xi’an 710049, Shaanxi, China;3. Micro-Optoelectronic Systems Laboratories, Xi’an Technological University, Xi’an 710032, Shaanxi, China;4. National Synchrotron Radiation Laboratory, University of Science and Technology of China, Anhui, 230029, Hefei, China;5. Research Institute of Superconductor Electronics (RISE), School of Electronic Science and Engineering, Nanjing University, Nanjing, Jiangsu, 210093, China |
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| Abstract: | Bi(Sc1/3Mo2/3)O4 ceramics were prepared via solid state reaction method. It crystallized with an ordered scheelite-related structure (a?=?16.9821(9)?Å, b?=?11.6097(3)?Å, c?=?5.3099(3)?Å and β?=?104.649(2)°) with a space group C12/C1, in which Bi3+, Sc3+ and Mo6+ are ?8, ?6 and ?4 coordinated, respectively. Bi(Sc1/3Mo2/3)O4 ceramics were densifiedat 915?°C, giving a permittivity (εr) ～24.4, quality factor (Qf, Q?=?1/dielectric loss, f?=?resonant frequency) ～48, 100?GHz and temperature coefficient of resonant frequency (TCF)?～??68?ppm/°C. Impedance spectroscopy revealed that there was only a bulk response for conductivity with activation energy (Ea) ～0.97?eV, suggesting the compound is electrically and chemically homogeneous. Wide band dielectric spectra were employed to study the dielectric response of Bi(Sc1/3Mo2/3)O4 from 20?Hz to 30?THz. εr was stable from 20?Hz to the GHz region, in which only ionic and electron displacive polarization contributed to the?εr. |
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| Keywords: | Microwave dielectric Low temperature co-fired ceramic (LTCC) |
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