Crystal structure and microwave dielectric properties of ATiO3, ATa2O6, AWO4 (A = Ni, Mg, Co) ceramics

Author

Kim, Eung Soo ; Jeon, Chang Jun

Author_Institution

Dept. of Mater. Eng., Kyonggi Univ., Suwon, South Korea

fYear

2009

fDate

23-27 Aug. 2009

Firstpage

1

Lastpage

6

Abstract

Microwave dielectric properties of ATiO₃, ATa₂O₆ and AWO₄ (A = Ni, Mg, Co) ceramics were investigated based on the structural characteristics of oxygen octahedra. ATiO₃ (trigonal ilmenite), ATa₂O₆ (tetragonal tri-rutile) and AWO₄ (monoclinic wolframite) ceramics have A- and B-site oxygen octahedra with the different sharing type. Quality factor (Qf) of the specimens was affected by the sharing types of oxygen octahedra. The temperature coefficient of resonant frequency (TCF) of the specimens was decreased with increasing of octahedral distortion per molar volume. The dielectric constant (K) of the specimens was dependent on the dielectric polarizabilities and cations bond valence between octahedral cations and oxygen ion.

Keywords

bonds (chemical); ceramics; cobalt compounds; crystal structure; dielectric materials; dielectric polarisation; magnesium compounds; microwave materials; nickel compounds; permittivity; CoTa₂O₆; CoTiO₃; CoWO₄; MgTa₂O₆; MgTiO₃; MgWO₄; NiTa₂O₆; NiTiO₃; NiWO₄; cation bond valence; crystal structure; dielectric constant; dielectric polarizability; microwave dielectric property; monoclinic wolframite ceramics; quality factor; resonant frequency; temperature coefficient; tetragonal trirutile ceramics; trigonal ilmenite ceramics; Bonding; Ceramics; Crystalline materials; Dielectric constant; Dielectric materials; Microwave devices; Powders; Q factor; Temperature; Titanium compounds;

fLanguage

English

Publisher

ieee

Conference_Titel

Applications of Ferroelectrics, 2009. ISAF 2009. 18th IEEE International Symposium on the

Conference_Location

Xian

ISSN

1099-4734

Print_ISBN

978-1-4244-4970-5

Electronic_ISBN

1099-4734

Type

conf

DOI

10.1109/ISAF.2009.5307567

Filename

5307567