[1] Ikesue A, Kinoshita T, Kamata K, et al. J. Am. Ceram. Soc., 1995, 78(4): 1033.

[2] Lu J R, Prabhu M, Xu J, et al. Appl. Phys. Lett., 2000, 77 (23): 3707.

[3] Lu J R, Prabhu M, Ueda K, et al. Laser Physics, 2001, 11: 1053.

[4] Lu J R, Ueda K, Yagi H, et al. Journal of Alloys and Compounds, 2002, 341: 220.

[5] Hurrell J P, Porto S P S, Chang I F, et al. Phys. Rev., 1968, 173(3): 851.

[6] Wadsack R L, Lewis Joan L, Argyle B E. Phys. Rev. B, 1971, 3(12): 4342.

[7] Papagelis K, Kanellis G, Ves S, et al. Phys. Stat. Sol. (b), 2002, 233(1): 134.

[8] Chen Y F, Lim P K, Lim S J, et al. J. Raman Spectrosc., 2003; 34: 882.

[10] Kato S, Iga T, Hatano S, et al. Yogyo-Kyokai-Shi., 1976, 84(5): 215.

[11] Saito N, Matsuda S, Ikegami T. J. Am. Ceram. Soc., 1998, 81(8): 2023.

[12] Sordelet D J, Akinc M. Colloids Int. Sci., 1988, 122(1): 47.

[13] Morgan H W, Staats P A. J. Applied Physics, 1962, 33: 364.

[15] Alben R, Weaire D, Smith Jr J E, et al. Phys. Rev. (B), 1975, 11(6): 2271.