Crystal structure of corundum type Mg 4(Nb 2– xTa x)O 9 microwave dielectric ceramics with low dielectric loss

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 octah...

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Published inJournal of the European Ceramic Society Vol. 23; no. 14; pp. 2485 - 2488
Main Authors Ogawa, Hirotaka, Kan, Akinori, Ishihara, Soichi, Higashida, Yutaka
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 2003
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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 2O 3.
AbstractList 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 2O 3.
Author Kan, Akinori
Ogawa, Hirotaka
Higashida, Yutaka
Ishihara, Soichi
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Issue 14
Keywords Niobates
Microwave ceramics
X-ray methods
Dielectric properties
Tantalates
Mg 4(Nb,Ta) 2O 9
Language English
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Snippet 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...
SourceID elsevier
SourceType Publisher
StartPage 2485
SubjectTerms Dielectric properties
Mg 4(Nb,Ta) 2O 9
Microwave ceramics
Niobates
Tantalates
X-ray methods
Title Crystal structure of corundum type Mg 4(Nb 2– xTa x)O 9 microwave dielectric ceramics with low dielectric loss
URI https://dx.doi.org/10.1016/S0955-2219(03)00167-5
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