A Model System for Interfacial Reactions in LTCC Materials

Published

April 1, 2003

Author(s)

Lawrence P. Cook, Winnie K. Wong-Ng, Peter K. Schenck, Mark D. Vaudin, J Suh

Abstract

Over the past decade, ceramic packaging materials have continued to increase in both chemical and structural complexity. At processing temperatures of 800 C to 900 C, the possibilities for interactions at interfaces between dissimilar materials are numerous. It is therefore important to establish a method for interpretation and prediction of interfacial reactions. We have investigated the system Ag-Bi₂O₃-Nb₂O₅-O as the first step in developing such a method. We have completed an isothermal phase equilibrium diagram at 850 C, which provides the basis for a thermodynamic model. By assuming local equilibrium and thermodynamic mobility of Ag and Bi₂O₃ at interfaces, the conventional phase diagram has been recast as an isothermal chemical potential diagram. Comparison of interfacial reaction zones predicted by the chemical potential model with those observed in Ag/BiNbO₄ and Ag/BiNb₅O₁₄ reaction couples affirms the mobility of Ag at the interface. Thermogravimetric monitoring of O₂ uptake has allowed us to obtain kinetic information as well. The possibility of a combined thermodynamic/kinetic model of interfacial interaction is discussed.

Proceedings Title

Ceramic Interconnect Technology, Conference | | 2003 IMAPS Conference and Exhibition on Ceramic Interconnect Technology the Next Generation

Volume

5231

Conference Dates

April 1, 2003

Conference Title

Proceedings of SPIE--the International Society for Optical Engineering

Pub Type

Conferences

Keywords

Ag-Bi₂O₃-Nb₂O₅-O, interfacial reaction, kinetics, LTCC, phase diagram, thermocynamics

Citation

Cook, L. , Wong-Ng, W. , Schenck, P. , Vaudin, M. and Suh, J. (2003), A Model System for Interfacial Reactions in LTCC Materials, Ceramic Interconnect Technology, Conference | | 2003 IMAPS Conference and Exhibition on Ceramic Interconnect Technology the Next Generation (Accessed April 24, 2024)