Abstract: A method of manufacturing a stable multifilament multiconductor with reduced losses includes making a billet by the single stacking technique. Conductive matrix rods and/or resistive matrix rods are disposed in the superconductor filament of the billet to form matrix channels between bundles of superconductor filaments. The rods preferably have a polygonal section, preferably square or rectangular, more preferably hexagonal.

Abstract: A method of making a solid magnetic material from Sm.sub.2 Fe.sub.17 N.sub.3-x type intermetallic nitride powder, where 0.ltoreq.x.ltoreq.1, comprises the following steps:a--the powder is mixed intimately with glass powder having a conversion temperature Tg between 260.degree. C. and 310.degree. C. and a softening temperature Tf less than 400.degree. C., the proportion of glass powder being between 10% and 30% of the total volume;b--the mixture is compressed to obtain a solid;c--the solid obtained is subjected in a neutral gas atmosphere to a heat cycle during which a temperature not less than Tf+5.degree. C. and not more than 420.degree. C. is maintained for at least one hour.