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Effective Ionic Radius of Y 3+ Determined from Lattice Parameters of Fluorite‐Type HfO 2 and ZrO 2 Solid Solutions

1994; Wiley; Volume: 77; Issue: 2 Linguagem: Inglês

10.1111/j.1151-2916.1994.tb07035.x

1551-2916

Dae‐Joon Kim, Sang‐Hoon Hyun, Seung‐Goo Kim, Masatomo Yashima,

Advanced ceramic materials synthesis

Fluorite type HfO 2 and ZrO 2 solid solutions were prepared by doping with 8 to 14 mol% of Ho 2 O 3 and Y 2 O 3 , and their lattice parameters were determined. In both HfO 2 and ZrO 2 systems, the lattice parameters of the solid solutions containing Ho 2 0 3 were consistently greater than those containing the same amounts of Y 2 O 3 . This indicated that the ionic radius of Ho 3+ was larger than that of Y 3+ in the fluorite structure solid solutions. The effective ionic radius of Y 3+ in eightfold coordination was estimated to be 0.1011 nm by using the measured lattice parameters and the empirical equations to predict the lattice parameters of the fluorite‐type solid solutions.