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 in | Journal of the European Ceramic Society Vol. 23; no. 14; pp. 2485 - 2488 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Elsevier Ltd
2003
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Subjects | |
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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 |
Author_xml | – sequence: 1 givenname: Hirotaka surname: Ogawa fullname: Ogawa, Hirotaka organization: Faculty of Science and Technology, Meijo University, 1-501 Shiogamaguchi, Tempaku-ku, Nagoya 468-8502, Japan – sequence: 2 givenname: Akinori surname: Kan fullname: Kan, Akinori email: d3013001@ccmailg.meijo-u.ac.jp organization: Faculty of Science and Technology, Meijo University, 1-501 Shiogamaguchi, Tempaku-ku, Nagoya 468-8502, Japan – sequence: 3 givenname: Soichi surname: Ishihara fullname: Ishihara, Soichi organization: Faculty of Science and Technology, Meijo University, 1-501 Shiogamaguchi, Tempaku-ku, Nagoya 468-8502, Japan – sequence: 4 givenname: Yutaka surname: Higashida fullname: Higashida, Yutaka organization: Japan Fine Ceramics Center, 4-1 Mutsuno 2-chome, Atsuta-ku, Nagoya 456-8587, Japan |
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Copyright | 2003 Elsevier Science Ltd |
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DOI | 10.1016/S0955-2219(03)00167-5 |
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Keywords | Niobates Microwave ceramics X-ray methods Dielectric properties Tantalates Mg 4(Nb,Ta) 2O 9 |
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References | Cho, Kim, Hong (BIB3) 1999; 14 Hakki, Coleman (BIB8) 1960; MTT-8 Adachi, Tsukada, Satoko (BIB10) 1978; 45 Shannon (BIB11) 1976; A32 Shannon, Dielectric polarizabilities of ions in oxide (BIB12) 1993; 73 Guo, Bhalla, Sheen, Ainger, Erdei, Subbarao, Cross (BIB4) 1995; 10 Kumada, Taki, Kinomura (BIB6) 2000; 35 Alford, Penn, Templeton, Wang (BIB1) 1997; 10 Alford, Penn (BIB5) 1996; 80 Adachi, Shiokawa, Tsukada, Satoko, Sugino (BIB9) 1979; 47 Martin-Gonzalez, Moran, Fuente, Alario-Franco (BIB2) 2001; 11 Satoko, Tsukada, Adachi (BIB7) 1978; 45 |
References_xml | – volume: 10 start-page: 18 year: 1995 end-page: 25 ident: BIB4 article-title: Strontium aluminum tantalume oxide and strontium aluminum niobium oxide as potential for HTSC thin film publication-title: J. Mater. Res. contributor: fullname: Cross – volume: 35 start-page: 1017 year: 2000 end-page: 1021 ident: BIB6 article-title: Single crystal structure refinement of a magunesium niobium oxide publication-title: Mater. Res. Bull. contributor: fullname: Kinomura – volume: 73 start-page: 348 year: 1993 end-page: 366 ident: BIB12 publication-title: J. Appl. Phys. contributor: fullname: Dielectric polarizabilities of ions in oxide – volume: A32 start-page: 751 year: 1976 end-page: 767 ident: BIB11 article-title: Revised effective ionic radii and systematic studies of interatomic distances in halides and chalcogenides publication-title: Acta. Cryst. contributor: fullname: Shannon – volume: 14 start-page: 114 year: 1999 end-page: 119 ident: BIB3 article-title: Microwave dielectric properties and application of rare-earth aluminates publication-title: J. Mater. Res. contributor: fullname: Hong – volume: 80 start-page: 5895 year: 1996 end-page: 5898 ident: BIB5 article-title: Sintered alumina with low dielectric loss publication-title: J. Appl. Phys contributor: fullname: Penn – volume: 11 start-page: 616 year: 2001 end-page: 619 ident: BIB2 article-title: Use of SrTiO publication-title: J. Mater. Chem. contributor: fullname: Alario-Franco – volume: 45 start-page: 1333 year: 1978 ident: BIB7 publication-title: J. Phys. Soc. Jpn contributor: fullname: Adachi – volume: MTT-8 start-page: 402 year: 1960 end-page: 410 ident: BIB8 article-title: A dielectric resonator method of measuring inductive capacities in the millimeter range publication-title: IRE Trans: Microwave Theory & Tech. contributor: fullname: Coleman – volume: 47 start-page: 1528 year: 1979 ident: BIB9 publication-title: J. Phys. Soc. Jpn. contributor: fullname: Sugino – volume: 10 start-page: 467 year: 1997 end-page: 472 ident: BIB1 article-title: Low loss sintered dielectric resonators with HTS thick films publication-title: J. Supercond. Sci. contributor: fullname: Wang – volume: 45 start-page: 874 year: 1978 ident: BIB10 publication-title: J. Phys. Soc. Jpn contributor: fullname: Satoko |
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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 |
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