Low-loss ceramics in the system (Mg1-xNix) 2TiO4 (x=0.02-0.1) have been prepared using the conventional solid-state ceramic route. The formation of (Mg 1-xNix)2TiO4 (x=0.02-0.1) solid solutions was confirmed by the EDX analysis and the lattice parameters measured, which linearly varied from Mg2TiO4 (a=b=c=8.4410 Å) to (Mg0.9Ni0.1)2TiO4 (a=b=c=8.4335 Å). The X-ray diffraction analysis also confirmed the coexistence of a cubic-structured (Mg1-xNix)2TiO4 and an ilmenite-structured second phase (Mg1-xNix)TiO 3. By increasing x, not only could the Q × f of the (Mg 1-xNix)2TiO4 solid solution be considerably increased from 150,000 GHz at x=0 to a maximum 238,000 GHz at x=0.05, the highest εr∼16.43 could also be obtained simultaneously. This was mainly due to the uniform grain morphology and the highest density of the specimen. A good combination of microwave dielectric properties (εr∼16.43, Q × f∼238,000 GHz at 9.8 GHz, and τf∼-55 ppm/°C) can be achieved for a specimen using (Mg0.95Ni0.05)2TiO4 sintered at 1400°C for 4 h.
|Journal||International Journal of Applied Ceramic Technology|
|Issue number||SUPPL. 1|
|Publication status||Published - 2010 Apr 1|
All Science Journal Classification (ASJC) codes
- Ceramics and Composites
- Condensed Matter Physics
- Materials Chemistry