Syntheses and Characterizations of Three Bismuth(III)‐Containing Mixed‐Metal Phosphates:Ba 2 Bi 2 M II (PO 4 ) 4 (M= Mn, Ni, Cu)

We present here the syntheses, crystal structures, and characterizations of three new mixed‐metal phosphate of Ba 2 Bi 2 M II (PO 4 ) 4 (M= Mn, Ni, Cu), which synthesized by traditional solid‐state reactions for the first time. Three title compounds crystallize in the orthorhombic system with space group P nma , their structure can be described as adjacent zig‐zag linear structure of [MP 4 O 16 ] ∞ along [100] further are connected by BiO 6 distorted octahedra to form 3D framework, where the Ba 2+ are located in tunnels running along the [001] direction. The Bi 3+ cations, which are surrounded by six oxygen atoms, show strong stereoactivities of 6  s 2 lone pair. The results of magnetic property measurements evidence on the antiferroagnetic properties of Ba 2 Bi 2 Mn(PO 4 ) 4 and ferromagnetic properties of Ba 2 Bi 2 M II (PO 4 ) 4 (M= Ni, Cu).