Sibi, K S; Radhakrishnan, A N; Deepa, M; Prabhakar Rao, P; Peter Koshy
(Elsevier, 2009)
CaREZrNbO7 (RE=La, Nd, Sm, Gd and Y) system changed from fluorite (F)-type to pyrochlore (P)-type structure when the ionic radius ratios, r(Ca2+–RE3+)av/r(Zr4+–Nb5+)av were larger than 1.34. Thus, the La, Nd, and
Sm ...