Phase evolution and enhanced dielectric properties of BaO路Nd₂O₃路TiO₂路B₂O₃ glass-based dielectrics containing CaCu₃Ti₄O₁₂

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• 作者：Sung Hun Key ; Dong Wook Lee ; Jae Woong Jung ; Byeong Kon Kim ; Yong Soo Cho ; ^{ycho@yonsei.ac.kr}
• 关键词：CaCu3Ti4O12 ; Borate glass ; Dielectric ; LTCC
• 刊名：Journal of Alloys and Compounds
• 出版年：2012
• 期刊代码：45_09258388
• 类别：ms
• 出版时间：25 July, 2012
• 卷：530
• 期：Complete
• 页码：40-47
• 文件大小：1859 K

摘要

CaCu₃Ti₄O₁₂ (CCTO) has been studied as a filler for the potential high k LTCC (low temperature co-fired ceramics) materials based on a nonconventional BaO路Nd₂O₃路TiO₂路B₂O₃ glass in terms of firing temperature and CCTO content. The material system was proven to be high crystallizable as the resultant crystalline phases of BaTi(BO₃)₂, BaNd₂Ti₅O₁₄ and NdBO₃ were observed. The relative content of the crystalline phases were strongly dependant on firing temperature and CCTO content. Interestingly, the 30 wt%CCTO sample showed early densification at 610-670 掳C and then unexpected expansion after 850 掳C. The 40-60 wt%CCTO samples showed the unexpected secondary densification behavior over the temperature range of 850-950 掳C. As a promising example, a combination consisting of the glass and 40 wt%CCTO exhibited k 鈭?5 and tan 未 鈭?.07, which is very rare at this low sintering temperature of 850 掳C. These materials system were found to be chemically very stable especially in the H₂SO₄ acid solution.