Abstract: To provide a method for forming a boron-containing thin film, by which a uniform boron thin film with good adhesion can be formed on the surface of a processing object, and also to provide a multilayer structure. An electrolysis apparatus includes an anode 1, a processing object 2 serving as a cathode, an electrolytic vessel 4, and a molten salt electrolytic bath 5. A variable power supply 6 is connected between the anode 1 and the processing object 2. The variable power supply 6 is configured to be capable of changing a voltage or current waveform during the electrolysis process. Current of an appropriate pulse waveform is applied in the molten salt for electrolysis to form a uniform boron thin film 3 within the processing object 2 having a complicated shape.

Abstract: Provided is a method for producing fine metal particles, wherein metal oxide powders can be used as a source of fine metal particles, and a method for producing fine metal particles can be provided avoiding the contamination of the molten salt electrolyte bath and the produced fine metal particles. A method for producing fine metal particles (112) is provided which comprises generating cathodic discharge outside and over the surface of an electrolyte bath (100) comprising metal oxide powders (110) suspended therein, whereby the metal oxide powders (110) are electrochemically reduced into the fine metal particles (112).

Abstract: Provided is a method for producing fine metal particles, wherein metal oxide powders can be used as a source of fine metal particles, and a method for producing fine metal particles can be provided avoiding the contamination of the molten salt electrolyte bath and the produced fine metal particles. A method for producing fine metal particles (112) is provided which comprises generating cathodic discharge outside and over the surface of an electrolyte bath (100) comprising metal oxide powders (110) suspended therein, whereby the metal oxide powders (110) are electrochemically reduced into the fine metal particles (112).

Abstract: To provide a method for forming a boron-containing thin film, by which a uniform boron thin film with good adhesion can be formed on the surface of a processing object, and also to provide a multilayer structure. An electrolysis apparatus includes an anode 1, a processing object 2 serving as a cathode, an electrolytic vessel 4, and a molten salt electrolytic bath 5. A variable power supply 6 is connected between the anode 1 and the processing object 2. The variable power supply 6 is configured to be capable of changing a voltage or current waveform during the electrolysis process. Current of an appropriate pulse waveform is applied in the molten salt for electrolysis to form a uniform boron thin film 3 within the processing object 2 having a complicated shape.