TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Composition: The composition comprises (wt.%): silumin powder (2-4), lead-free glass frits (2-3), organic binder (21-23), stearic acid zinc (0.2-0.5), and aluminum powder (balance). The silumin powder comprises silicon (12.6-99.9 wt.%). The lead-free glass frits comprise Al2O3, SiO2, ZnO, B2O3, BaO, and Bi2O3. The aluminum powder is spherical in shape.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The organic binder comprises (wt.%): polyvinyl butyral (1-4), ethyl cellulose (3-6), butyl carbitol (5-30), butyl carbitol acetate (20-45), and terpineol (balance). EXAMPLE - Based on the total weight of glass frits, Al2O3 (2 wt.%), SiO2 (9 wt.%), ZnO (13 wt.%), B2O3 (8 wt.%), BaO (1 wt.%), and Bi2O3 (balance) were well mixed in a mixer and were poured into a platinum crucible. The mixture in the platinum crucible was placed in a heating furnace at 950 degrees C, and was then kept for 10 minutes after all oxides contained in the mixture were smelted completely to ensure that a homogeneous molten glass mixture was obtained. The molten glass mixture was quenched with water, and was ground to obtain the glass frits having a size less than 10 mu m. Based on the total weight of silumin powder, silicon (75 wt.%) and aluminum (25 wt.%) respectively obtained from silicon and aluminum briquettes with 99.99% purity were disposed in a crucible of a vacuum induction melting furnace. The furnace was evacuated to reduce the pressure in it to less than 10-3 torr, and was heated to 1600 degrees C. The silicon and aluminum were smelted completely at this condition, and after 10 minutes, a molten silumin mixture was thus obtained. The molten silumin mixture was well mixed using a magnetic stirring device. The molten silumin mixture was atomized by impacting the same using nitrogen gas at a pressure of 20 atm to give silumin powder, followed by cooling at room temperature. Based on the total weight of an organic binder, polyvinyl butyral (2 wt.%), ethyl cellulose (5 wt.%), butyl carbitol (25 wt.%), butyl carbitol acetate (25 wt.%), and terpineol (balance) were mixed at 85 degrees C to give a clear and homogeneous organic binder. Based on the total weight of a lead-free conductive paste composition, the silumin powder (2 wt.%), glass frits (2 wt.%), organic binder (23 wt.%), stearic acid zinc (0.5 wt.%), and the spherical-shaped aluminum powder (balance) with 99.8% purity were well mixed in a mixer for 40 minutes, and were then ground and dispersed in a 3-roll kneader to give a lead-free conductive paste composition having a particle size of less than 10 mu m.