ā¦ceramics are lead oxide (PbO), ruthenium dioxide (RuO2), bismuth ruthenate (Bi2Ru2O7), and bismuth iridate (Bi2Ir2O7). Like metals, these materials have overlapping electron energy bands and are therefore excellent electronic conductors. They are used as āinksā for screen printing resistors into thick-film microcircuits. Inks are pulverized conductor and glaze particles dispersedā¦
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