Publication Date:
2019
Description:
Abstract
A novel system Li3Mg2(Nb(1−x)Mox)O6+x/2 (0 ≤ x ≤ 0.08) microwave dielectric ceramics were fabricated by the solid‐state method. The charge compensation of Mo6+ ions substitution for Nb5+ ions was performed by introducing oxygen ions. The X‐ray diffraction patterns and Rietveld refinements indicated Li3Mg2(Nb(1−x)Mox)O6+x/2 ceramics with single phase and orthorhombic structure. Micro‐structure and density confirmed that the grain of Li3Mg2(Nb(1‐x)Mox)O6+x/2 ceramics grew well. In addition, the permittivity of Li3Mg2(Nb(1−x)Mox)O6+x/2 ceramics with the same trend as density decreased slightly with increasing Mo6+ ions content. However, the Q*f and τf were obviously improved with an appropriate amount of Mo6+ ions. When x ≤ 0.04, the Q*f was closely related to the bond valence of samples, while when x ≥ 0.06, the Q*f was closely related to the density of samples. The variations of τf and oxygen octahedral distortion were the opposite. In conclusions, the Li3Mg2(Nb0.98Mo0.02)O6.01 ceramic sintered at 1200°C for 6 hours exhibited outstanding properties: εr ~ 15.18, Q*f ~ 116 266 GHz, τf ~ −15.71 ppm/oC.
Print ISSN:
0002-7820
Electronic ISSN:
1551-2916
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
