O-anion transport measured in severalR2M2

Gary L. Catchen

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Todd M. Rearick

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Investigation about thermal conductivities of La2Ce2O7 doped with calcium or magnesium for thermal barrier coatings

“…Thus, it can be concluded from Fig. 1 [32][33][34].The pyrochlore oxides were found to be stable when the radius ratio (r A /r B ) of the cations lies in range 1.46-1.78 [35]. Mandal et al have reported this radius ratio as 1.2-1.6 [32].…”

High-pressure structural changes in theGd2Zr2O7pyrochlore

“…1 Cation disordering greatly enhances the formation of anion Frenkel defects. [10][11][12] At normal pressure, the ordered pyrochlore structure can form for r A / r B = 1.46 to 1.78 ͑Refs. 1, 6, and 13͒ and highpressure or high-temperature synthesis can greatly extend this stability range.…”

Investigation about thermophysical properties of Ln2Ce2O7 (Ln=Sm, Er and Yb) oxides for thermal barrier coatings

“…It is well known that there are two kinds of crystal structures of A 2 B 2 O 7 oxides, which are pyrochlore structure and fluorite structure. The phase structures in which A 2 B 2 O 7 crystallize depend on (a) the relative ionic size ratio (r A /r B ) of A and B cations [23][24][25]. The pyrochlore oxides were found to be stable when the ionic radius ratio (r A /r B ) lies in range 1.46-1.78 [26].…”