Effect of Lanthanum Oxide Addition on Dielectric Loss and Microstructure of AlN Ceramics

Abstract:

Article Preview

The effect of sintering additives on dielectric loss tangent and microstructure of AlN ceramics have been investigated. Different amounts of Y2O3 and La2O3 were added as sintering additives to AlN powder and pressureless sintering was performed at 1900 °C for 2 h in a flowing nitrogen atmosphere. Bulk densities of sintered AlN were found to be 3.27 and 3.32 Mg·m-3 when Y2O3 contents were 0.5 and 1 mol%, respectively. The bulk densities of AlN-Y2O3 increased with increasing La2O3 content. Densities of 3.41 and 3.42 Mg·m-3 were obtained for 0.5 mol%Y2O3-1 mol%La2O3-AlN and 1 mol%Y2O3-1 mol%La2O3-AlN ceramics respectively. A decrease in tan δ was observed with increase in La2O3 content and a minimum value of 1.3 x 10-3 was obtained for 0.5 mol%La2O3-1 mol%Y2O3-AlN ceramic in the present study.

Info:

Periodical:

Edited by:

Keiichi Katayama, Kazumi Kato, Tadashi Takenaka, Masasuke Takata and Kazuo Shinozaki

Pages:

197-200

DOI:

10.4028/www.scientific.net/KEM.320.197

Citation:

S. Kume et al., "Effect of Lanthanum Oxide Addition on Dielectric Loss and Microstructure of AlN Ceramics ", Key Engineering Materials, Vol. 320, pp. 197-200, 2006

Online since:

September 2006

Export:

Price:

$35.00

[1] M. González and A. Ibarra, Diamond and Related Materials, 9 (2000) p.467.

[2] I.P. Fesenko and M.A. Kuzenkova, Powder Metallurgy and Metal Ceramics, 41 (2002) p.567.

[3] K. Nishizono and U. Oh, Japan kokai tokkyo koho, Toku-kai2001-181049, Japan, 3 July (2001).

[4] N.M. Alford, J. Breeze, X. Wang, S.J. Penn, S. Dalla, S. J. Webb, N. Ljepojevic, X. Aupi, Dielectric loss of oxide single crystals and polycrystalline analogues from 10 to 320 K, J. Euro. Ceram. Soc. 21 (15) (2001) 2605-2611.

DOI: 10.1016/s0955-2219(01)00324-7

[5] K. Tajima and H. Uchimura, Japan kokai tokkyo koho, Toku-kai-hei8-295567, Japan, 12 November (1996).

[6] K. Watari, H. J. Hwang, M. Toriyama and S. Kanzaki, J. Mater. Res., 14 (1999) p.1409.

[7] G. Pezzotti, A. Nakahira and M. Tajika, J. Euro. Ceram. Soc., 20 (2000) p.1319.

[8] T. Koyama and M. Ishii, Japan kokai tokkyo koho, Toku-kai2001-233676, Japan, 28 August (2001).

[9] S.J. Penn, N.M. Alford, A. Templeton, X. Wang, M. Xu, M. Reece and K. Schrapel, J. Am. Ceram. Soc., 80 (1997) p.1885.

[10] S. Kume, M. Yasuoka, N. Omura and K. Watari, J. Euro. Ceram. Soc., 25 (2005) p.2791.

[11] S. Kume, M. Yasuoka, N. Omura and K. Watari, Int. J. Refract. Met. Hard Mat., 23 (2005) p.382.

[12] K. Komeya, H. Inoue and A. Tsuge, Yogyo-Kyokai-Shi, 89 (1981) p.330.

In order to see related information, you need to Login.