Lattice energy and polymorphism of fluorite-related rare earth-tantalum double oxides
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説明
Abstract The polymorphism of “R 3 TaO 7 ” compounds, which were regarded to be stable phases as 3:1 compounds in the R 2 O 3 Ta 2 O 5 system (R=rare earth), are discussed in terms of lattice energies, calculated by the Ewald method. The phase with higher crystal symmetry has the negatively smaller lattice energy, so that the phase with higher symmetry become less stable; Cmcm>C222 1 >Fd3m>Pm3m>Fm3m. This is in accordance with experimental observations.
収録刊行物
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- Solid State Ionics
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Solid State Ionics 35 275-279, 1989-09-01
Elsevier BV