Abstract

A series of inverse spinel ceramics, Ga 2 [Li 1+ x Ga 3 ]O 8+δ (0.05 = x ≤ 0.125), were synthesized by the conventional solid-phase reaction. The addition of Li ( x ≤ 0.1) increased the order degree of octahedra cations and caused an expansion in cell volume, and the maximum solution was located at 0.1–0.125. The dielectric constant of Ga 2 [Li 1+ x Ga 3 ]O 8+δ ceramics increased with the ionic polarizability of primitive unit cell, and the optimum microwave dielectric performances were obtained at x = 0.1 sample sintered at 1260 °C with ε r = 10.78 ± 0.1, Q × f = 171,171 ± 500 GHz, and τ f = −56.47 ± 1.0 ppm/°C. The τ f showed an opposite variation trend to that of the Ga1 bond valence and octahedron distortion. The Q × f was determined by the packing fraction and FWHM of 424 cm −1 Raman mode. In addition, the intrinsic dielectric properties of Ga 2 [Li 1+ x Ga 3 ]O 8+δ ceramics were evaluated by infrared reflectivity spectra. The results show that Ga 2 [Li 1+ x Ga 3 ]O 8+δ ceramic is a promising substrate material.

Full Text
Paper version not known

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call

Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.