Crystal structure of corundum type Mg4(Nb2–xTax)O9 microwave dielectric ceramics with low dielectric loss
書誌事項
- 公開日
- 2003-01
- 権利情報
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- https://www.elsevier.com/tdm/userlicense/1.0/
- DOI
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- 10.1016/s0955-2219(03)00167-5
- 公開者
- Elsevier BV
この論文をさがす
説明
Abstract New microwave dielectric ceramics, i.e. Mg 4 (Nb 2− x Ta x )O 9 (MNT) solid solutions, were synthesized and their microwave dielectric properties and crystal structure were investigated in this study. From the discrete variational Xα (DV-Xα) method, it was found that the Ta–O bonds in the TaO 6 octahedron become more covalent than Nb–O bonds in the NbO 6 octahedron; this result leads to the decrease of the ionicity in the Ta 5+ ion. The dielectric constants of MNT were slightly decreased from 12.4 to 11.5; this result might be due to the covalent interaction of Ta–O bonding. The quality factors of the samples were found to exhibit high value ( Q · f ≒350 000 GHz for x =2) which is comparable to those of Al 2 O 3 .
収録刊行物
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- Journal of the European Ceramic Society
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Journal of the European Ceramic Society 23 (14), 2485-2488, 2003-01
Elsevier BV