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Chemistry of Rare Earth Containing Oxide-fluoride Compounds
Takashima, Masayuki,Yonezawa, Susumu,Kim, Jae-Ho,Nishibu, Shiori 한국공업화학회 2004 Journal of Industrial and Engineering Chemistry Vol.10 No.7
The binary rare-earth oxide fluorides, Ln₂Ln'₂O₃F_(6) in which Ln and Ln' are different rare earths, were synthesized by the solid state reaction between Ln₂O₃ and Ln'F₃ at a temperature around 1000℃. Among Ln₂Ln'₂O₃F_(6) compounds, Nd₂Eu₂O₃F_(6) gave the conductivity of 3.5 Sm^(-1) at 600℃ under PO₂= 0.4 Pa, and the transport numbers of oxide ion and electron were measured to be around 0.9 and less than 0.05, respectively, at a temperature ranging from 500 to 700℃. The crystal structure of Nd₂Eu₂O₃F_(6) was determined to be the monoclinic lattice with the parameters of a_(0) = 0.396 nm, b_(0) = 1.13 nm, c_(0) = 0.562 nm, β = 134.84°, Z = 1. Ld₂Ln'₂O₃F_(6) compounds were applicable properties as an oxide ion-conducting solid electrolyte. Besides, new oxide-fluoride glasses containing large amount of rare earth elements consist of LnF₃-BaF₂-AlF₃-GeO₂ were obtained reproducibly by quenching from the melts. The glasses were found to exhibit unique optical properties such as fluorescence.