present invention relates to a Cd-free and Pb-free glass composition comprising, based in mol %, 1-10% MO where M is selected from Ba, Sr, Ca and mixtures thereof, 5-30% MgO, 0.3-5% CuO, 0-2.5% P2O5, 0-2.5% ZrO2, 24-45% ZnO, 2-10% Al2O3, 35-50% SiO2 and 0.1-3% A2O where A is selected from the group of alkali elements and mixtures thereof wherein the glass composition is useful in thick paste dielectric materials which are compatible with AlN substrates.

 
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