The preferential site occupation and magnetic properties of GdxY2−xO3

X‐ray diffraction analysis of powder and thin film of (Gd1‐xYx)2O3 prepared by sol‐gel process

“…In a previous work [19,22], we found a similar random distribution of cations in (Er 1-q Gd q ) 2 O 3 and (Gd 1-q Ho q ) 2 O 3 which is attributed to the small difference in cationic radii. Depending on the difference in cationic radii, a random distribution is obtained whenever the difference between the cationic radii is small (e.g Y 2-q Re q O 3 , Re = Dy and Ho, [15,25], and preferential one is obtained for longer difference in radii (e.g Eu 2-q Yb q O 3 [20]; Y 2-q Gd q O 3 [26] and Y 2-q Eu q O 3 [17] ). Nevertheless, a random cationic distribution was found in Sm 2-q Y q O 3 [27] where partitioning was expected because of the relatively big difference in cationic radii.…”

Magnetic properties of trivalent Sm ions in SmxY2−xO3

“…In diluted RE x Y 2−x O 3 sesquioxides, the preferred occupation of a cationic site may take place when a significant mismatch in the ionic radii of RE 3+ and Y 3+ is present [19]. In spite of applying long thermal annealing, preferential occupation can take place not only due to the ionic radii mismatch but also because of a specific symmetry of both crystallographic site and ionic electron orbitals.…”

Preparation of Y2O3:Eu3+ nanopowders via polymer complex solution method and luminescence properties of the sintered ceramics

“…In this structural type cations occupy two different crystallographic positions 8b (1/4, 1/4, 1/4) with point symmetry3 (S 6 , C 3i ) and 24d (x, 0, 1/ 4) with point symmetry 2 (C 2 ). For both sites cations are octahedrally coordinated while the oxygen ion, in the general 48e position, is tetrahedrally surrounded [13]. Elementary cell is body centered with 16 formulae units.…”