Nephelauxetic effect and (r^k)_4fexpectation values of Er³⁺in ionic crystals

Nephelauxetic effect and 〈r〉4f radial integrals of Pr3+ in crystals

“…The values of β k from Table 1 are less than one in almost all cases, k-dependent and within a few percent from the free-ion limit. If β k are compared with the same crystals, containing Pr 3+ or Er 3+ [39], e.g. LaF 3 , LaCl 3 , LiYF 4 , Ln 2 O 3 , LnTiTaO 6 , NaCa 2 Mg 2 V 3 O 12 , those with Pr 3+ exhibit more pronounced nephelauxetic effect.…”