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Crystal structure, electric and microwave dielectric properties of La2Mg(Mg1/3Sb2/3)O6 novel double-perovskite with non-stoichiometric 1:1 cationic ordering.
- Source :
-
Journal of the European Ceramic Society . Mar2023, Vol. 43 Issue 3, p1000-1008. 9p. - Publication Year :
- 2023
-
Abstract
- In this contribution, the novel double-perovskite La 2 Mg(Mg 1/3 Sb 2/3)O 6 has been successfully prepared by solid-state reaction method, and its structure has been determined for the first time by a combination of X-ray and neutron powder diffraction data analysis. The novel material exhibits a thermal expansion of ∼9.1 ppm/°C and a large optical band gap (4.23 eV). The complex impedance data analysis indicates that La 2 Mg(Mg 1/3 Sb 2/3)O 6 features a Debye-like behaviour, with a bulk conductivity, σ b , varying between 10-7-10-4 S ‧cm-1 within 500–900 °C temperature range, and activation energy (E a) of ∼ 1.36 eV. In addition, the microwave dielectric properties of La 2 Mg(Mg 1/3 Sb 2/3)O 6 sintered at 1625 °C display optimized quality factor (Q× f) of ∼ 28,700 GHz (f = 9.65 GHz), a dielectric constant (ε r) of ∼ 20.2 and temperature coefficient of the resonant frequency (τ f) of ∼ − 89 ppm/°C. This work widen the reduced number of A 3 + B 2 / 3 2 + B 1 / 3 5 + O 3 compounds explored so far. [Display omitted] [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09552219
- Volume :
- 43
- Issue :
- 3
- Database :
- Academic Search Index
- Journal :
- Journal of the European Ceramic Society
- Publication Type :
- Academic Journal
- Accession number :
- 160442703
- Full Text :
- https://doi.org/10.1016/j.jeurceramsoc.2022.10.033