METHOD OF PRODUCING BIPHASIC THERMOELECTRIC CERAMICS Russian patent published in 2021 - IPC C04B35/46 C04B35/47 B82Y40/00 

FIELD: nanotechnology.

SUBSTANCE: invention relates to nanotechnology, namely to methods for producing new biphasic ceramic materials for the needs of thermoelectric generation. A method for producing biphasic thermoelectric ceramics includes preparing a powder system from initial powders of strontium carbonate SrCO₃ and titanium dioxide TiO₂ by their combined high-energy grinding in ethanol, annealing and drying, after which the resulting material is sintered under mechanical stress. The powder system is formed from submicron strontium carbonate powder SrCO₃ and nanosized powder of titanium dioxide TiO₂, taken in an amount that provides a ratio of the phases formed after sintering strontium titanate SrTiO₃ and titanium dioxide TiO₂ in the form of rutile by volume 1:1. Drying is carried out at a temperature of 60-80°C for 24-48 hours, followed by granulation of the powder system through a sieve with an effective mesh size of 75 microns and followed by annealing in air at 600-800°C for 2-4 hours. The resulting material is subjected to reaction spark plasma sintering at an external pressure of 21.5 MPa at a heating rate of 55°C/min to 1200-1250°C and held at this temperature for 5 minutes. Annealing is optionally carried out after sintering.

EFFECT: obtaining biphasic thermoelectric ceramics SrTiO₃/TiO₂ with a uniform distribution of phases in the entire volume, saturated with interfaces between two phases, where the formation of a two-dimensional electron gas is possible.

1 cl, 2 dwg, 1 tbl