Sr(Ga0.5Nb0.5)1−xTixO3 Low-Loss Microwave Dielectric Ceramics with Medium Dielectric Constant
The microwave dielectric properties of Sr(Ga0.5Nb0.5)1−xTixO3 (x = 0, 0.1, 0.2 and 0.3) ceramics have been investigated together with their microstructures. Single‐phase solid solutions are achieved in this series of ceramics. The ordering features are comprehensively analyzed by transmission electr...
Saved in:
Published in | Journal of the American Ceramic Society Vol. 98; no. 8; pp. 2534 - 2540 |
---|---|
Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
Columbus
Blackwell Publishing Ltd
01.08.2015
Wiley Subscription Services, Inc |
Subjects | |
Online Access | Get full text |
Cover
Loading…
Summary: | The microwave dielectric properties of Sr(Ga0.5Nb0.5)1−xTixO3 (x = 0, 0.1, 0.2 and 0.3) ceramics have been investigated together with their microstructures. Single‐phase solid solutions are achieved in this series of ceramics. The ordering features are comprehensively analyzed by transmission electron microscopy and Raman spectroscopy. Local 1:1 ordering in B‐site leads to a double‐cubic structure with space group Fm3¯m, while Ti substitution disrupts this 1:1 ordering between Ga and Nb, and the metastable ordering between Ti and (Ga + Nb) is speculated to form due to their large size difference. The dielectric constant and temperature coefficient of resonant frequency increase nonlinearly as x increases, while the Qf value decreases gradually. The variation trend of Qf value is mainly attributed to the intrinsic loss because of the increasing vibrational anharmonicity by Ti substitution. The ordering transition from short coherence, long‐range ordering to short‐range ordering with increasing Ti content has an agreeable and weak effect on the Qf value. The best combination of microwave dielectric properties is achieved for the composition of x = 0.3: εr = 46.6, Qf = 42 200 GHz and τf = 5.0 ppm/°C. |
---|---|
Bibliography: | istex:AACB1E67DD3EF4A04D3E8D61CC75C44A76FC0F5D National Natural Science Foundation of China - No. 11274270 ArticleID:JACE13655 ark:/67375/WNG-J6NNPTRX-V |
ISSN: | 0002-7820 1551-2916 |
DOI: | 10.1111/jace.13655 |