We investigated effects of substituting cobalt for magnesium on microstructures and microwave dielectric properties of BaMg 1/3Nb 2/3O 3 ceramics. Nucleation and growth of 1:2 ordered domains dominate microstructural variations for Ba(Mg 1-xCo x) 1/3Nb 2/3O 3 ceramics. Microstructures such as grains sizes and domain sizes significantly dominate variations of Q×f value. Less ordered domains are nucleated when substituting small amount of cobalt (x<0.1). Accordingly, domains and grains significantly grow with increased cobalt substitution. The 1:2 ordering degree is subsequently increased, and Q×f achieves a maximum value at x=0.05. Nevertheless, while cobalt substitution exceeds x=0.1, more ordered nuclei occur and consequently affect the domain growth and the grain growth. The Q×f value remarkably decreases at x=0.1, and varies due to different ordering degrees and compositions. The Q×f value of specimens at x=0.05 becomes as high as 43,000, and is similar to that of specimens at x=0.5.
|Number of pages||8|
|Journal||Journal of the European Ceramic Society|
|Publication status||Published - 2012 Aug|
All Science Journal Classification (ASJC) codes
- Ceramics and Composites
- Materials Chemistry