METHOD OF SYNTHESIS OF SINGLE-CRYSTAL TETRAGONAL TELLURIDES OF IRON AND TELLURIDES OF IRON, ALLOYED BY GRAY AND/OR SELENIUM

摘要

A method of synthesis of iron tellurides and tellurides of iron alloyed with up to 40% selenium and (or) to 10% sulfur, which comprises heating the sealed ampoule disposed in one end of the charge from tellurium, selenium and sulfur, and iron, and filled with the molten salt, wherein that the ampules heating is carried out with a temperature gradient, the magnitude of 600 ° C-790 ° C, by placing the charge to a temperature reduced by 30 ° C-100 ° C on the opposite side, at the same time as molten salt mixtures of the eutectic composition, include various combinations sodium, potassium, rubidium and cesium, and heating is carried out for a time that ensures the transfer of charge from tellurium, selenium, sulfur and iron in the opposite end of the ampoule.