Abstract: The present invention relates to a process for the preparation of high-grade chloramine by the action of commercial eau de Javelle of 100 chlorometric degrees on a solution of ammonia in the presence of ammonium chloride. According to this process, the chloramine is obtained having a content greater than or equal to 2 mol L−1, that is to say, greater than or equal to 10.3%. The process can be carried out continuously or discontinuously.

Abstract: A method of manufacturing metal alloys to obtain a homogeneous powder made up of oxides of the metals and applications thereof to the manufacture of semiconductors and superconductors comprises, after placing the various metals selected in a crucible, melting the metals in a neutral or reducing atmosphere while stirring the liquid to homogenize it, recovering the liquid alloy, spraying the alloy obtained to form homogeneous powder particles of determined particle size, and oxidizing the particles. It applies to the manufacture of zinc oxide-based varistor type semiconductor ceramics and to the manufacture of superconductor products or positive or negative temperature coefficient thermistors.

Abstract: A lead based alloy for electrode supports of a lead-acid storage cell, the alloy containing between 0.05% and 4% antimony between 0.02% and 0.3% magnesium, and no barium. The magnesium permits a reduced antimony content, thereby reducing the corrosion, self-discharge, and hydrogen-releasing overvoltage problems caused by the presence of antimony in electrode supports, without adversely affecting the beneficial mechanical properties provided by antimony. It is essential to have no barium, which causes cracking and high mass corrosion of the alloy during use in a lead-acid cell.