Binary rare-earth oxide fluorides

Preparation and properties of the binary rare-earth oxide fluoride... 

As mentioned in section 6.2, binary rare-earth oxide fluorides, LnLn O vF,., where Ln and Ln are different rare-earth elements coming respectively from Ln203 and Ln F3... 

Fig. 3. The route of formation reaction of binary rare-earth oxide fluorides, Ln2Ln 0.tF6.

The electrical conductivity of rare-earth oxide fluorides was first investigated for the development of a binary anion conductive solid electrolyte. As a result, it was found that the binary rare-earth oxide fluorides exhibited oxide ion conductivity. Among them, the conductivity of neodymium europium oxide fluoride, Nd2Eu203F6, was reported to be much higher than that of yttria-stabilized zirconia, YSZ, practically used as an oxygen sensor [34]. The electrical conductivities of the binary rare-earth oxide fluorides vary not only with the combination of Ln203 with Ln F3... 

Fig. 7. The electrical conductivities of binary rare-earth oxide fluorides, Ln-Ln 203F6 measured at 650 C under an oxygen partial pressure of 1.33 x 10 Pa. , more than 1 Sm 1 3 0.1-1 Sm Q, less than 0.1 S m (reproduced with permission from Solid State Ionics, 23 (1989) 99 [19]).

When the binary rare-earth oxide fluorides are utilized in a solid-state fuel battery, they must often withstand at a high temperature of around 1000°C to exhibit sufficient oxide ion mobility, i.e. to supply appropriate electrical current. These... 

Crystal structures of binary rare-earth oxide fluorides... 

Because no single crystal of any binary rare-earth oxide fluoride has been obtained to date, computational efforts such as Rietveld analysis have been carried out to determine the crystal structure by means of X-ray and neutron powder diffraction. While... 

Tada M., Fujihara S., Kimura T. Sol-gel processing and characterization of alkaline earth and rare-earth fluoride thin films. J. Mater. Res. 1999 14 1610-1616 Takahashi M., Izuki M., Kanno R., Kawamoto Y. Up-conversion characteristics of Er in transparent oxyfiuoride glass-ceramics. J. Appl. Phys. 1998 83 3920-3922 Takashima M., Kano G. Preparation and electrical condnctivity of binary rare earth metal fluoride oxides. Solid State Ionics 1987 23 99-106... 

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