Crystal structure, impedance and broadband dielectric spectra of ordered scheelite-structured Bi(Sc1/3Mo2/3)O4 ceramic. Issue 4 (April 2018)

• Record Type: Journal Article
• Authors: Zhou, Di; Pang, Li-Xia; Wang, Da-Wei; Guo, Huan-Huan; Yang, Fan; Qi, Ze-Ming; Li, Chun; Jin, Biao-Bing; Reaney, Ian M.
• Is Part Of: Journal of the European Ceramic Society. Volume 38:Issue 4(2018)
• Page Start: 1556
• Page End: 1561
• Publication Date: 2018-04
• Subjects: Microwave dielectric -- Bi(Sc1/3Mo2/3)O4 -- Low temperature co-fired ceramic (LTCC); Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2017.12.044
• Languages: English
• ISSNs: 0955-2219

Abstract

Graphical abstract: Abstract: Bi(Sc1/3 Mo2/3 )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 Bi 3+, Sc 3+ and Mo 6+ are −8, −6 and −4 coordinated, respectively. Bi(Sc1/3 Mo2/3 )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(Sc1/3 Mo2/3 )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 .