Metallization compositions for BI and PB-containing ceramic dielectrics

摘要

It has been newly determined that in a reaction of an Ag/Pd metallization with Pb from a lead-based ceramics, a maximum solubility of Pb is observed of approximately 14% (atomic percent). By inclusion of an effective amount of Pb in the Ag/Pd metallization, leaching of Pb from a Pb-based ceramic is either reduced or eliminated. Thus, upon firing, the metallization exhibits an equilibration which prevents Pb from being drawn out of the underlying ceramic. Similarly, Ag/Pd metallization shows a maximum solubility of 16 atomic percent for Bi in Bi-based ceramics. Inclusion of an effective amount of Bi in the metallization prevents a Bi leaching from an underlying ceramic.