ml of deionized water after dissolution 2 ml suspension of 3 u00d7 10 u2212 3 mol l cu metal nanoparticles was added and stirred for 24 h then 30 ml of absolute ethanol 8 ml of aqueous ammonia 1 2 ml tetraethyl orthosilicate were added successively with stirring after 2 h of reaction the ph of the resulted solution was adjusted to 5 then 10 8 ml of 1 mol l sr no 3 2 5 4 ml of 0 2 mol l ba no 3 2 3 6 ml of 0 1 mol l mg no 3 2 5 4 ml of 0 4 mol l eu no 3 3 4 ml of 0 01 mol l srcl 2 in solutions were added after stirring 18 ml of 1 mol l nh 4 2 co 3 was added dropwise slowly and the mixture was stirred for another 5 hours then the obtained precipitate was placed in an oven for drying it was subjected to heat treatment at 700 u00b0 c for 6 h then placed in an agate mortar and ground until mixed uniformly and the resulted powder was transferred to an alundum crucible then sintered at 1350 u00b0 c for 6 h in a tubular furnace under weakly reducing atmosphere consisting of 95 of n 2 and 5 of h 2 in volume for reduction then it was cooled to room.