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Low‐temperature sintering and thermal stability of Li2GeO3‐based microwave dielectric ceramics with low permittivity.
- Source :
- Journal of the American Ceramic Society; Oct2018, Vol. 101 Issue 10, p4608-4614, 7p, 1 Black and White Photograph, 1 Chart, 6 Graphs
- Publication Year :
- 2018
-
Abstract
- Abstract: A low‐permittivity dielectric ceramic Li<subscript>2</subscript>GeO<subscript>3</subscript> was prepared by the solid‐state reaction route. Single‐phase Li<subscript>2</subscript>GeO<subscript>3</subscript> crystallized in an orthorhombic structure. Dense ceramics with high relative density and homogeneous microstructure were obtained as sintered at 1000‐1100°C. The optimum microwave dielectric properties were achieved in the sample sintered at 1080°C with a high relative density ~ 96%, a relative permittivity ε<subscript>r</subscript> ~ 6.36, a quality factor Q × f ~ 29 000 GHz (at 14.5 GHz), and a temperature coefficient of resonance frequency τ<subscript>f</subscript> ~ −72 ppm/<superscript>°</superscript>C. The sintering temperature of Li<subscript>2</subscript>GeO<subscript>3</subscript> was successfully lowered via the appropriate addition of B<subscript>2</subscript>O<subscript>3</subscript>. Only 2 wt.% B<subscript>2</subscript>O<subscript>3</subscript> addition contributed to a 21.2% decrease in sintering temperature to 850°C without deteriorating the dielectric properties. The temperature dependence of the resonance frequency was successfully suppressed by the addition of TiO<subscript>2</subscript> to form Li<subscript>2</subscript>TiO<subscript>3</subscript> with a positive τ<subscript>f</subscript> value. These results demonstrate potential applications of Li<subscript>2</subscript>GeO<subscript>3</subscript> in low‐temperature cofiring ceramics technology. [ABSTRACT FROM AUTHOR]
- Subjects :
- DIELECTRICS
CERAMICS
LITHIUM compounds
CRYSTALLIZATION
MICROSTRUCTURE
SINTERING
Subjects
Details
- Language :
- English
- ISSN :
- 00027820
- Volume :
- 101
- Issue :
- 10
- Database :
- Complementary Index
- Journal :
- Journal of the American Ceramic Society
- Publication Type :
- Academic Journal
- Accession number :
- 131052094
- Full Text :
- https://doi.org/10.1111/jace.15723