An Oxygen-Rich Pyrochlore with Fluorite Composition

New high-pressure phase and equation of state of Ce2Zr2O8

“…25 The anion filled rhombohedral pyrochlore phase reported by Thomson et al 25 has a Ce 2 Zr 2 O 7.97 composition. Also, it has been reported that the samples appear to be close to yelloworange in color, which has been attributed to the incomplete oxidation of Ce 3þ , as the oxidation is carried out at a relatively low temperature.…”

“…Because cerium oxide (CeO 2 ) is used as a surrogate material to simulate the thermo-physical properties of radioactive PuO 2 , studies on cerium containing oxides are extremely important for nuclear technology. Recently, Surble et al 20 [24][25][26][27][28][29] In particular, Ce 2 Zr 2 O 8 exists as a cubic fluorite structure 29,30 or metastable tetragonal structures. 31,32 It also is well known that the fluorite structure transforms to different crystalline modifications with pressure.…”

Phases in Ce0.5Zr0.5O2−x system

“…This process is similar to the intercalation of oxygen into the pyrochlore oxide Ce 2 Zr 2 O 7 [11].…”

α-PbO₂-related phase appearing in the Sn^IV–Ta–O system transformed from cation-ordered fluorite-related phase

“…As a result, the structural framework of the precursor A 2 B 2 O 7 pyrochlore including the ordered arrangement of the respective cations is left in the resulting ABO 4 4 ; therefore, such an oxidation of the pyrochlore phase is termed oxygen-intercalation. 5) We previously reported the oxygen-intercalation into the Sn NbO pyrochlore phase containing Sn II ions. 8), 9) In that case, we observed surprise transformation from pyrochlore phase to cationordered ¡-PbO 2 and rutile related phases in addition to the transformation from pyrochlore phase to cation-ordered fluorite phase.…”