Open AccessКорреляция между величинами фтор-ионной проводимости кристаллов Sr-=SUB=-1-x-=/SUB=-R-=SUB=-x-=/SUB=-F-=SUB=-2+x-=/SUB=- (тип CaF-=SUB=-2-=/SUB=-) и R-=SUB=-1-y-=/SUB=-Sr-=SUB=-y-=/SUB=-F-=SUB=-3-y-=/SUB=- (тип LaF-=SUB=-3-=/SUB=-) в системах SrF-=SUB=-2-=/SUB=--RF-=SUB=-3-=/SUB=- (R=La-Nd)
Author(s) -
Н. И. Сорокин,
Б. П. Соболев
Publication year - 2019
Publication title -
fizika tverdogo tela
Language(s) - English
Resource type - Journals
eISSN - 1726-7498
pISSN - 0367-3294
DOI - 10.21883/ftt.2019.11.48409.368
Subject(s) - analytical chemistry (journal) , eutectic system , x ray crystallography , electrical resistivity and conductivity , crystallography , conductivity , materials science , mineralogy , physics , chemistry , microstructure , diffraction , optics , chromatography , quantum mechanics
The “conductivity logarithm–composition” correlation logσ_dc( x ) = ax + b has been revealed for the strongly nonstoichiometric fluorite Sr_1 – _ x R_ x F_2 + _ x ( x is the RF_3 molar fraction, 0.15 ≤ x ≤ 0.47) and tysonite R_1 – _ y Sr_ y F_3 – _ y ( y is the SrF_2 molar fraction, y = 1 – x , 0.85 ≤ x ≤ 0.97) phases in the SrF_2–RF_3 systems (R = La, Ce, Pr, Nd). The conductivity σ_dc of the eutectic 70LaF_3 + 30SrF_2 (mol %) composite fits well with the dependence logσ_dc( x ) for the nonstoichiometric Sr_1 – _ x La_ x F_2 + _ x and La_1 – _ y Sr_ y F_3 – _ y phases.