“…38,39 The high radiation damage tolerance of Rb 3 Ln(PO 4 ) 2 (Ln = Y, La, Pr, Nd, and Sm–Lu) provides the possibility as potential nuclear waste form materials. 40 To date, a great number of rubidium-based phosphates have been discovered and reported, such as RbNiFe(PO 4 ) 2 , 41 RbZn(PO 3 ) 3 42 and Rb 6 Bi 4 (PO 4 ) 2 (P 2 O 7 ) 3 . 43…”