Phase evolution and enhanced dielectric properties of BaO·Nd 2O 3·TiO 2·B 2O 3 glass-based dielectrics containing CaCu 3Ti 4O 12

Sung Hun Key, Dong Wook Lee, Jae Woong Jung, Byeong Kon Kim, Yong Soo Cho

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

CaCu 3Ti 4O 12 (CCTO) has been studied as a filler for the potential high k LTCC (low temperature co-fired ceramics) materials based on a nonconventional BaO·Nd 2O 3·TiO 2·B 2O 3 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(BO 3) 2, BaNd 2Ti 5O 14 and NdBO 3 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 °C and then unexpected expansion after 850 °C. The 40-60 wt% CCTO samples showed the unexpected secondary densification behavior over the temperature range of 850-950 °C. As a promising example, a combination consisting of the glass and 40 wt% CCTO exhibited k ∼55 and tan δ ∼0.07, which is very rare at this low sintering temperature of 850 °C. These materials system were found to be chemically very stable especially in the H 2SO 4 acid solution.

Original languageEnglish
Pages (from-to)40-47
Number of pages8
JournalJournal of Alloys and Compounds
Volume530
DOIs
Publication statusPublished - 2012 Jul 25

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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