Structure and magnetic properties of the double‐perovskites Ba₂(B,Re)₂O₆ (B = Fe, Mn, Co and Ni)

Abstract

Structural and magnetic properties of Ba 2 (B,Re) 2 O 6 (B = Fe, Mn, Co and Ni) double-perovskite oxides have been investigated. Rietveld analysis shows that all our synthesized samples are single phase and crystallize at room temperature in the cubic double-perovskite structure with Fm3m space group. Magnetization measurements versus temperature and versus magnetic applied field up to 5 T show that Ba 2 (Fe,Re) 2 O 6 , Ba 2 (Mn,Re) 2 O 6 and Ba 2 (Ni,Re) 2 O 6 are ferromagnetic at low temperature with T C = 318 K, 113 K and 32 K respectively while Ba 2 (Co,Re) 2 O 6 is antiferromagnetic below T N = 25K.

Neutron diffraction studies and the magnetism of an ordered perovskite: Ba2CoTeO6

“…It can be noted that other double perovskites with an ordered cubic structure from the barium series of compounds, namely Ba 2 CoMO 6 (M=W, Mo, Re, U) [44][45][46][47][48][49][50], also order antiferromagnetically at low temperatures (see Table 5), all with somewhat different but still low values of T N . It is important to understand the possible influence of the M cations on this difference.…”

Crystal growth and structural investigation of A2BReO6 (A=Sr, Ba; B=Li, Na)

“…The double perovskites rhenates, A 2 BReO 6 , such as Ba 2 MnReO 6 [22], A 2 FeReO 6 (A ¼ Ca, Sr, Ba) [23,24], Ba 2 (B/Re) 2 O 6 (B ¼ Fe, Mn, Co and Ni) [25], Sr 2 CrReO 6 [26], Sr 2 Fe 0.9 Sc 0.1 ReO 6 [27], and Ba 2 LnReO 6 [28] have been widely studied for their physical properties. Among this group, however, the alkali metal containing rhenates are not well represented, although the first syntheses of A 2 BReO 6 (A ¼ Ca, Ba, Sr; B ¼ Li, Na) were carried out by Sleight et al [29,30] many years ago.…”