Abstract
The non-stoichiometric Li3Mg2Sb1−xO6 (0.05 ⩽ x ⩽ 0.125) compounds have been prepared via the mixed oxide method. The influences of Sb nonstoichiometry on the sintering behavior, microstructure, phase composition along with microwave dielectric performances for Li3Mg2Sb1−xO6 ceramics were studied. Combined with X-ray diffraction (XRD) and Raman spectra, it was confirmed that phase composition could not be affected by the Sb nonstoichiometry and almost pure phase Li3Mg2SbO6 was formed in all compositions. Appropriate Sb-deficiency in Li3Mg2SbO6 not only lowered its sintering temperature but also remarkably improved its Q×f value. In particular, non-stoichiometric Li3Mg2Sb0.9O6 ceramics sintered at 1250 °C/5 h owned seldom low dielectric constant εr = 10.8, near-zero resonant frequency temperature coefficient τf = −8.0 ppm/°C, and high quality factor Q×f = 86,300 GHz (at 10.4 GHz). This study provides an alternative approach to ameliorate its dielectric performances for Li3Mg2SbO6-based compounds through defect-engineering.
Highlights
Nowadays, the high-speed advancement in the 5thgeneration communication industry has prompted a massive demand for dielectric materials owning outstanding dielectric properties in the high-frequency region [1]
We firstly reported the microwave dielectric performances (Q f = 49,000 GHz, τf = –18.0 ppm/°C) of nominal composition LMS ceramics prepared with a mixed oxide method [9]
The influences of Sb-site nonstoichiometry on the sintering behavior, phase constitution combined with microwave dielectric characterizations of Li3Mg2Sb1–xO6 compounds have been studied
Summary
The high-speed advancement in the 5thgeneration communication industry has prompted a massive demand for dielectric materials owning outstanding dielectric properties in the high-frequency region [1]. The LMS compound has received much attention due to its potential application in fields such as luminescence and microwave dielectric materials [9,10,11,12,13]. We firstly reported the microwave dielectric performances (Q f = 49,000 GHz, τf = –18.0 ppm/°C) of nominal composition LMS ceramics prepared with a mixed oxide method [9]. We doped modified solid-state reaction method, which effectively suppressed the secondary phase SbOx and improved the sinterability and dielectric characterizations of LMS ceramics [10]. Many researchers have demonstrated that the sintering behavior and dielectric performances can be ameliorated through introducing non-stoichiometric composition in some material systems [14,15,16,17]. The influences of Sb-site nonstoichiometry on the sintering behavior, phase constitution combined with microwave dielectric characterizations of Li3Mg2Sb1–xO6 compounds have been studied
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