CONGRUENTLY MELTING FLUORINE-CONDUCTING SOLID ELECTROLYTE MRFWITH FLUORITE STRUCTURE FOR HIGH-TEMPERATURE THERMODYNAMIC RESEARCHES Russian patent published in 2017 - IPC H01M6/18 H01M10/56 H01M10/58 

FIELD: chemistry.

SUBSTANCE: invention relates to the field of fluorine-conducting solid electrolytes (PCSE). Fluorine-conducting solid electrolytes M_1-xR_xV_2+x with a fluorite structure in the single-crystal form are proposed for the high-temperature thermodynamic studies of chemical substances containing fluorides of alkaline earth (M) and rare-earth (R) metals. The composition is selected that ensures their congruence. To do this, their compositions are selected by corresponding maxima on the melting curves of the fluorite phases on the phase diagrams of the systems MF₂ - RF₃ and contain: difluoride CaF₂ with additives of trifluorides RF₃ (R=Sm, Gd, Tb, Ho, Er, Y) at a ratio of CaF₂ 89-96 moll. % and KF 4-11 moll. %; difluoride SrF₂ with additives of trifluorides RY₃ (R=La, CE, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Y) at a ratio of SrF₂ 69-90 moll. % and RF₃ 10-31 moll. % and also difluoride BaF₂ with additives of trifluorides RF₃ (R=La, CE, Pr, Nd, Sm, Gd, Tb) at a ratio of BaF₂ 69-96 moll. % and RF₂ 4-31 moll. %, which provides the testing for the fluoride-ion conductivity σexceeding 1×10^-1 Ohm^-1cm^-1 at temperatures of 450-1570°C.

EFFECT: invention allows the creation of promising fluorine-conducting solid electrolytes, which allow increasing the functioning of solid-state galvanic cells for thermodynamic studies.

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