High-dielectric-constant and low-loss ceramics in the (1-x)Nd(Zn 1/2Ti1/2)O3-xSrTi03 system have been prepared by the conventional mixed-oxide route and their microwave dielectric properties have been investigated. A two-phase system was confirmed by the X-ray diffraction patterns, theenergy-dispersive X-ray spectrometer analysis, and the measured lattice parameters. Addition of SrTiO3, having a much smaller grain size in comparison with that of Nd(Zn1/2Ti 1/2)O3, could effectively hold back abnormal grain growth in the Nd(Zn1/2Ti1/2)O3 matrix. Evaporation of Zn at high temperatures caused an increase in the dielectric loss of the system. The temperature coefficient of resonant frequency increases with increasing SrTiO3content and tunes through zero at x=0.52. Specimens with x=0.52 possessed an excellent combination of microwave dielectric properties: e τ̃54.2, Q×f̃84000 GHz. It is proposed as a suitable candidate material for today's 3G passive components and small-sized GPS patch antennas.
All Science Journal Classification (ASJC) codes
- Ceramics and Composites
- Materials Chemistry