The various metals and alloys glucose metabolism have been widely used in science and technology. Many amorphous alloys, such as Fe-based amorphous alloys, possess superior magnetic properties compared to their crystalline counterparts because of their unique atomic structures [1]. A great deal of effort has been devoted to iron series alloy nanoparticles because of the novel optical, catalytic, electrical, and magnetic properties [2�C8]. Generally, the preparation methods of the nanoalloys have strict environment requirement or complicated experiment process because of the strong activity of the fresh metal nanoparticles [9�C12]. The metal-boron alloys nanoparticles were generally prepared in solution by chemical reduction method.

But a variety of synthetic parameters, such as the ratio of the reactants, pH of the solution, and the order of the materials added, have significant effect on the morphology of the obtained materials in the aqueous chemical reduction which has been researched in recent years [13�C17]. Room temperature solid-solid chemical reaction is a novel technique for preparation of nanosized materials. Recently, we have found that some amorphous alloys nanoparticles and the copper, bismuth, or antimony nanocrystalline particles can be prepared very easily by room temperature solid-solid reaction [18�C21]. The reaction can be quickly accomplished at room temperature, which is a challenge to those traditional methods.Lead can form eutectic alloy [22, 23] or hypomonotectic alloy [24�C26] with another metal and is applied to the battery or lubricating materials, electrical contact materials, superconducting materials, and so on.

In recent years, the prepared method and character of a series of lead alloys have been studied. The preparation and characteristics of Fe-Pb, Ni-Pb, and a series of ternary alloys about lead have been reported [27�C29]. Lead is a soft metal and it is insoluble in iron under equilibrium conditions. Therefore, the study on the room temperature solid-solid chemical reaction preparation of the lead-based multicomponent alloy nanomaterials will be very interesting not only for studying incompatibility alloy, but also for exploration of the new preparation method of other multicomponent alloy nanoparticles.

In this work, the Fe-Ni-Pb-B multicomponent alloy nanoparticles are synthesized by room temperature solid-solid chemical reaction, the effect of the mole ratio of potassium borohydride and the metal salts on the component of the alloy nanoparticles is discussed, and the magnetic performance is tested.2. ExperimentalAll chemicals used in the preparation experiment were in analytical grade, which were purchased from Chengdu Kelong Chemical Reagent Factory in China. Ferric trichloride hexahydrate, AV-951 nickel chloride hexahydrate, and lead acetate trihydrate were weighed and placed in an agate mortar and mixed up, and the corresponding mole ratio of the three metal salts was 1.00:1.00:0.500.