Microwave Dielectric Properties of (Sr1−xAx)2(Zn1−xBx)Si2O7 Ceramics (A=Ca, Ba and B=Co, Mg, Mn, Ni)
The (Sr1−xAx)2(Zn1−xBx)Si2O7 ceramics (A=Ca, Ba and B=Co, Mg, Mn, Ni) were prepared by the conventional solid‐state ceramic route and their structure and microwave dielectric properties were investigated. The majority of the compositions have an akermanite‐type structure except for A/B=Ba/Zn and Sr/...
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| Published in: | Journal of the American Ceramic Society 2010-01, Vol.93 (1), p.147-154 |
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| Main Authors: | , |
| Format: | Article |
| Language: | eng |
| Online Access: | Request full text |
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| Summary: | The (Sr1−xAx)2(Zn1−xBx)Si2O7 ceramics (A=Ca, Ba and B=Co, Mg, Mn, Ni) were prepared by the conventional solid‐state ceramic route and their structure and microwave dielectric properties were investigated. The majority of the compositions have an akermanite‐type structure except for A/B=Ba/Zn and Sr/Ni. A structural change is observed from tetragonal to monoclinic with the increase in Ba2+ content at the Ca‐site. When Zn2+ was completely replaced by Ni2+, a mixture of SrSiO3 and NiO phases resulted instead of the solid solution Sr2NiSi2O7. The variation of cell parameters and cell volumes of (Sr1−xAx)2(Zn1−xBx)Si2O7 was studied for various compositions (x) in the range 0–1. Excellent dielectric properties (ɛr=8.4, Qu×f=105 000 GHz (at 12.628 GHz) and τf=−51.5 ppm/°C) were obtained for the composition Sr2ZnSi2O7 when sintered at 1475°C/2 h. Addition of 2 wt% of SrTiO3 to Sr2ZnSi2O7 decreased the τf value to −13 ppm/°C with ɛr=8.8, Qu×f=60 000 GHz (at 12.585 GHz). Thus, a composite of Sr2ZnSi2O7 and SrTiO3 is a possible material for millimeter‐wave communication systems and as microwave substrates. |
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| ISSN: | 0002-7820 1551-2916 |