TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The antimony trihydride is simultaneously formed from an aqueous solution of antimony and potassium tartrate and potassium borohydride. The precursor of the metal element is a mixture of a fatty-acid with a straight or branched, saturated or unsaturated carbon chain having 4-36 carbon atoms, preferably a linear alkyl chain having 12-18 carbon atoms, where the precursor of the metal element is formed by reaction of the metal element in a solvent of an organic or inorganic salt, and the fatty-acid is lauric acid, myristic acid, palmitic acid, stearic acid and oleic acid. The solvent is an organic compound comprises saturated or unsaturated hydrocarbons with a boiling point of above 150 degrees C, where the solvent is 1-octadecene. The reaction medium includes ligands i.e. amines that consists of octylamine, decylamine, tetradecylamine, hexadecylamine or oleylamine, where the reaction medium is maintained in at 140-250 degrees C, preferably 150-220 degrees C. The nanoparticles are subjected to a thermal annealing process at a 200-300 degrees C, preferably 220 degrees C for 30 minutes to 4 hours, preferably 1 hour, where the nanoparticules are indium antimonide nanoparticules, where the indium precursor is indium myristate obtained from indium acetate and the myristic acid. The colloidal solution comprises crystallized nanocrystals according to the cubic phase of indium (0.5) antimony (0.5) and crystallized nanocrystals according to the phase of indium (0.4) antimony (0.6) having a size distribution of less than 30%.    TECHNOLOGY FOCUS - METALLURGY - Preferred Components: The nanoparticles are formed with a precursor of a metal element under favorable conditions in the presence of antimony trihydride. A liquid medium, a reaction medium including the precursor of the metal element and a solvent are provided, and the reaction medium is reacted under favorable conditions in presence of antimony trihydride to form the nanoparticles, where the antimony trihydride is injected into the reaction medium, and the metal element is aluminum, gallium, indium, thallium, zinc, cadmium, iron, cobalt, nickel, bismuth, scandium, titanium, vanadium, chromium, manganese, copper, rubidium, strontium, yttrium, zirconium, niobium, ruthenium, rhodium, palladium, silver, cesium, barium, hafnium, iridium, platinum, gold, tin or lead. EXAMPLE - No suitable example given.