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- Title
Microstructure and microwave dielectric properties of TiO-doped pseudo-wollastonite ceramics.
- Authors
Hu, Wei; Liu, Hanxing; Hao, Hua; Yao, Zhonghua; Cao, Minghe; Wang, Zhijian; Song, Zhe
- Abstract
The effects of TiO addition on the densification, microstructure and microwave dielectric properties of pseudo-wollastonite ceramics ( α-CaSiO) have been investigated. The X-ray diffraction (XRD) patterns results indicate that samples exhibit a two-phase system, which has a wollastonite-structured α-CaSiO primary phase associated with a CaTiSiO minor phase. However, the TiO addition undermines the microwave dielectric properties because of the poor quality factor of the secondary phase of CaTiSiO, which can inhibit the growth of α-CaSiO grains by surrounding their boundaries. The α-CaSiO ceramics containing 2 wt% of TiO sintered at 1,300 °C showed excellent microwave dielectric properties: an ε value of 7.86, a quality factor Q × f value of 16,491 GHz, and a τ value of 0.76 ppm/ °C.
- Subjects
TITANIUM dioxide; DIELECTRIC properties; WOLLASTONITE; X-ray diffraction; CERAMIC materials
- Publication
Journal of Materials Science: Materials in Electronics, 2014, Vol 25, Issue 11, p4730
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-014-2224-4