Microwave dielectric ceramics with rare-earth elements (I)

• Published in: Journal of the Korean Physical Society Vol. 61; no. 6; pp. 971 - 979
• Main Authors: Ohsato, Hitoshi, Kagomiya, Isao, Chae, Ki-Woong
• Format: Journal Article
• Language: English
• Published: Seoul The Korean Physical Society 01-09-2012; 한국물리학회
• Subjects: Mathematical and Computational Physics; Particle and Nuclear Physics; Physics; Physics and Astronomy; Theoretical; 물리학; Homologous compound; Rare-earth; Ceramics; Microwave dielectrics; Pseudo-tungstenbronze-type compounds
• ISSN: 0374-4884; 1976-8524
• DOI: 10.3938/jkps.61.971

Nearly half of the microwave dielectric materials include rare-earth elements based on a database presented by M. T. Sebastian. The presence of rare-earth elements helps to improve the microwave dielectric properties because the crystal structure is adjusted by the ionic radius of the rare-earth element. The microwave dielectrics are grouped by the crystal structure: (1) pseudotungstenbronze Ba
6−3
x
R
8+2
x
Ti
18
O
54
solid solutions, (2) homologous Ba
n
La
4
-Ti
3+
n
O
12+3
n
compounds (3) Y
2
BaCu
2
O
5
green phases, (4) aeschynite LaYTiO
6
and scheelite BaWO
4
compounds, (5) perovskite-type
AB
O
3
compounds, (6) garnet
A
3
B
2
′
B
3
″O
12
compounds. The materials group (3)–(6) are presented. We discuss the groups (1)–(2) in this paper, and presented in “Microwave Dielectric Ceramics with Rare-earth (II)”.