Correlation between the crystal structure and upconversion emission of Ho3+ in AHfO3 (A = Ca, Sr, and Ba)

Analytical electron microscopy study of the composition of BaHfO3 nanoparticles in REBCO films: the influence of rare-earth ionic radii and REBCO composition

“…For perovskites with ABO 3 stoichiometry, both A 2+,CN12 and B 4+,CN6 are possible substitution sites for REEs. 42,44–46…”

“…For perovskites with ABO 3 stoichiometry, both A 2+,CN12 and B 4+,CN6 are possible substitution sites for REEs. 42,[44][45][46] The ionic radius of an element depends on the oxidation state and the CN. For REE incorporation into the perovskites, we assume a constant REE oxidation state of 3+ and the same CN as the substitution site for the REEs in analogy to ref.…”

“…[74][75][76]79,80 Note that the tolerance factor is only a qualitative metric to predict perovskite-phase stability based on ionic radii. The substitution-site probability may be affected by other aspects such as charge compensation, 44,46 exact A/B cation ratio, 42 or oxygen partial pressure p O 2 . 42 The latter two factors are especially important to consider for REBCO-BMO nanocomposites.…”

“…7 is qualitative and considers only the phase stability of the BMO nanoparticles from a geometrical point of view. In addition to the factors affecting REE substitution into BMO (charge compensation, 44,46 A/B cation ratio, p O 2…”

“…Indeed, REE-doped barium-oxide perovskites are studied in different scientific contexts. 42–46 This work considers four possible lattice sites (REE and Ba in REBCO, and Ba and Hf in BHO) for the REEs in REBCO–BHO nanocomposites as schematically shown in Fig. 1 using the atomic structure of REBCO and BHO.…”