BRIDGING THE RUDDLESDEN-POPPER AND THE DION-JACOBSON SERIES OF LAYERED PEROVSKITES - SYNTHESIS OF LAYERED OXIDES, A2-XLA2TI3-XNBXO10 (A=K, RB), EXHIBITING ION-EXCHANGE
S. Uma et al., BRIDGING THE RUDDLESDEN-POPPER AND THE DION-JACOBSON SERIES OF LAYERED PEROVSKITES - SYNTHESIS OF LAYERED OXIDES, A2-XLA2TI3-XNBXO10 (A=K, RB), EXHIBITING ION-EXCHANGE, Journal of materials chemistry, 3(7), 1993, pp. 709-713
Solid solutions of the formula, A2-xLa2Ti3-xNbxO10 (A=K, Rb), exist fo
r the range 0 less-than-or-equal-to x less-than-or-equal-to 1.0, bridg
ing n = 3 members of the Ruddlesden-Popper series (A2La2Ti3O10) and th
e Dion-Jacobson series (ALa2Ti2NbO10). For 0 less-than-or-equal-to x l
ess-than-or-equal-to 0.75, the phases possess body-centred structures
characteristic of the Ruddlesden-Popper phases, while the x = 1 member
s are isostructural with KCa2Nb3O10 (A = K) and CsCa2Nb3O10 (A = Rb).
Protonated derivatives, H2-xLa2Ti3-xNbxO10, which are prepared by ion
exchange, retain the structural difference of the parent phases. A dif
ference in the Bronsted acidity of the protonated derivatives revealed
by intercalation experiments with organic bases seems to be related t
o this structural difference.