LAMELLAR CRYSTALLINE MATERIAL AND A METHOD OF ITS PREPARING

摘要

FIELD: monocrystalline materials of high quality. SUBSTANCE: lamellar monocrystalline material showing low defect level and the corresponding distribution of impurities that allows to intercalate at least 3 mole lithium into van der Waals channel per one mole of crystalline material without significant crystalline lattice distortion. Also, change of Gibbs free energy does not depend of lithium concentration incorporation. Material is prepared by the sequence stages. Ampoule is filled with stoichiometric amount of chalcogenid element and bismuth under nonoxidizing atmosphere and sealed. Then ampoule is heated to temperature 5-10 C above of bismuth chalcogenid melting point and cooled to the room temperature. Obtained polycrystalline bismuth chalcogenid is contacted with seeding crystal with specific structure of crystalline lattice. Obtained harmless nondefected monocrystal of bismuth chalcogenid is cooled to the room temperature. Some admixtures can be added to the prepared crystalline material to obtain highly intercalated crystalline material. Obtained crystalline material is used as active battery member, thermoelectric device and capacitor. EFFECT: enhanced quality of material.