The NCB(Na2O-CaO-B2O3)-doped Ca0.3(Li1/2Sm1/2)0.7TiO3(CLST) ceramics were fabricated via the traditional ceramic process. The relation between NCB dopant contents and the crystal structure, microstructure, sintering behavior, and dielectric properties of CLST ceramics were investigated systematically. The results indicate that the second phases are not found when NCB dopant contents are in the range from 1wt% to 15wt% and the major phase of CLST ceramics is still orthorhombic perovskite. With the increase of NCB content, the densification temperature and bulk density of CLST ceramics decrease, the dielectric constant εr and the product of quality factor and resonance frequency Qf value also decrease, and the temperature coefficient of resonant frequency τf increases to positive. NCB can effectively decrease the sintering temperature of CLST from 1300℃ to 900℃. The sample of CLST with 12.5wt% NCB sintered at 900℃ for 5h still has excellent dielectric properties: εr=73.7, Qf=1583GHz, τf=140.1×10-6/℃, which satisfies the design demand of high dielectric constant and multilayer microwave components.
LI Yue-Ming
,
SONG Ting-Ting
,
YOU Yuan
,
HU Yuan-Yun
,
LIU Wei-Liang
,
TANG Chun-Bao
. Research on Low-temperature Sintering of Ca0.3(Li1/2Sm1/2)0.7TiO3 Microwave Dielectric Ceramics[J]. Journal of Inorganic Materials, 2008
, 23(6)
: 1293
-1297
.
DOI: 10.3724/SP.J.1077.2008.01293
[1] 赵梅瑜, 王依琳. 电子元件与材料, 2002, 21 (2): 30-34.
[2] 童建喜, 张启龙, 杨辉, 等. 硅酸盐学报, 2006, 34 (11): 1135-1140.
[3] Hong Zheng, Ian M Reaney, Duncan Muir, et al. J. Eur. Ceram. Soc., 2007, 27 (16): 4479-4487.
[4] Dernovsek O, Naeini A, Preu G, et al. J. Eur. Ceram. Soc., 2001, 21 (10-11): 1693-1697.
[5] Cho Kyung-Hoon, Lim Jong-Bong, Nahm Sahn, et al. J. Eur. Ceram. Soc., 2007, 27 (2-3): 1053-1058.
[6] Albina Y Borisevich, Peter K Davies. J. Am. Ceram. Soc., 2004, 87 (6): 1047-1052.
[7] 张启龙, 杨辉, 刘兴元, 等. 硅酸盐学报, 2005, 33 (7): 793-798.
[8] 管恩祥, 陈玮, 罗澜(GUAN En-Xiang, et al). 无机材料学报(Journal of Inorganic Materials), 2007, 22 (2): 315-318.
[9] 李月明, 宋婷婷, 胡元云, 等(LI Yue-Ming, et al). 无机材料学报(Journal of Inorganic Materials), 2008, 23 (4): 695-699.
[10] Shannon R D. Acta Cryst., 1976, A32: 751-767.
[11] 黄静. 武汉: 华中科技大学博士学位论文, 2004.
[12] 张迎春. 铌钽酸盐微波介质陶瓷材料. 北京: 科学出版社, 2006. 3-7.
[13] 何进, 杨传仁. 电子元件与材料, 1995, 14 (2): 7-13.