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New Lanthanum Borates-Based Low Temperature Dielectrics
Keywords: LTCC, dielectrics, borates
New microwave dielectric materials based on lanthanum borates (La2O3-B2O3) systems modified with divalent oxides (CaO, MgO and ZnO) and rare earth oxides (Nd2O3 and Sm2O3) have been investigated as new candidates applicable for the low temperature co-fireable system. The low temperature microcircuit technology provides practical and viable merits primarily in that inexpensive low-melting conductor (e.g., Ag and Cu) can be utilized with the subsequent increment of integration density. Several different batches of glass consisting of 60 mol% B2O3, 20 mol% rare earth oxide (i.e., La2O3, Nd2O3 or Sm2O3) and 20 mol% divalent oxide (i.e., CaO, MgO, or ZnO) were successfully prepared by quenching melts from 1400oC. A fixed amount of 40 wt% Al2O3 filler was then added to form rigid samples through subsequent firing at 850oC for 30 minute in ambient atmosphere. As a specific example of optimized dielectric characteristics, a high-quality factor of ~1090 and a dielectric constant of 8.32 at 17.04 GHz was obtained for the Zn and La-based material system. Understanding of developed crystalline phases during the firing process and their correlations to consequential microwave dielectric properties in the newly-developed material systems are the main purpose of this presentation.
Yong Soo Cho, Associate Professor
Yonsei University
Seoul 120-749,

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