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- Title
Phase evolution, Raman spectroscopy and microwave dielectric behavior of (LiNb) doped ZrO-TiO system.
- Authors
Pang, Li-Xia; Wang, Hong; Zhou, Di; Chen, Yue-Hua; Yao, Xi
- Abstract
The phase evolution, Raman spectroscopy and microwave dielectric properties of (LiNb) doped ZrO-TiO system were investigated. The effects of the Zr/Ti ratio and the (LiNb) substitution were addressed. X-ray diffraction and electron diffraction analysis showed that the crystalline phases of the (LiNb) doped ZrO-TiO ceramics depended greatly on the Zr/Ti ratio. The sample with Zr/Ti ratio of 7/9 crystallized as ZrTiO phase structure, a commensurate structure with a tripled a-axis superstructure and a ZZ sequence. Secondary phase of monoclinic ZrO phase appeared when the Zr/Ti ratio was as high as 9/7. Raman analysis showed that the Raman peaks located at 651 and 624 cm were assigned to the vibration modes of Zr-O octahedron and Ti-O octahedron, respectively. The dielectric constant and quality factor ( Qf value) of the (LiNb) doped ZrO-TiO ceramics decreased slightly as the Zr/Ti ratio changed from 6/10 to 9/7. The temperature coefficient of resonate frequency ( TCF value) was sensitive to the Zr/Ti ratio and it showed a negative value when the Zr/Ti ratio was close to 5:7. Meanwhile, the TCF value of ZrO-TiO ceramics could also be tailored by the (LiNb) substitution.
- Subjects
CERAMIC materials; DIELECTRICS; RAMAN spectroscopy; X-ray diffraction; ELECTRON diffraction
- Publication
Applied Physics A: Materials Science & Processing, 2010, Vol 100, Issue 4, p1205
- ISSN
0947-8396
- Publication type
Article
- DOI
10.1007/s00339-010-5838-2