Neutron powder diffraction study of the crystal and magnetic structures of BiNiO3 at low temperature

Electronic structure ofBiMO3multiferroics and related oxides

“…X-ray powder-diffraction data has revealed that Bi ions were disproportionately weighted toward Bi 3+ and Bi 5+ and therefore the oxidation state of the Ni ion was +2 rather than the expected +3. 46,47 The Curie constant estimated from the magnetic susceptibility of BiNiO 3 is close to that expected for S = 1 rather than for S =1/ 2 system. This fact as well as BVS confirms the divalent nature of Ni.…”

Intermetallic charge-transfer transition in Bi1−xLaxNiO3Oka1, Mizumaki2, Sakaguchi3 et al. 2013Phys. Rev. BSelf Cite340150View full textAdd to dashboardCite

“…Refinements gave correspondingly small magnetic moments of <0.1 μ B for the orthorhombic Bi 1−x La x NiO 3 components, demonstrating the nonmagnetic nature of this metallic orthorhombic phase. In contrast, the ordered magnetic moments per Ni in the triclinic phases at 10 K are 1.66(4) μ B for x = 0.05, 1.72(6) μ B for x = 0.10, and 1.64(11) μ B for x = 0.20, close to that of triclinic BiNiO 3 (1.74(3) μ B at 5 K) 14 containing Ni 2+ (S = 1). The temperature dependence of the magnetic moment of Ni 2+ in the triclinic phase is shown in Fig.…”

“…6 The magnetic structures of the triclinic and orthorhombic phases were analyzed to discover whether the G-type antiferromagnetic ordering found in the parent compound, triclinic BiNiO 3 , persists in the Bi 1−x La x NiO 3 derivatives. 14 Figure 4 shows a magnified view of the NPD pattern of x = 0.10 collected on diffractometer D1B at 10 K, where the weight fractions of the triclinic and orthorhombic phases were 47% and 52%, respectively. Although the G-type antiferromagnetic ordering does not give further Bragg reflections because it has the same √ 2a × √ 2a × 2a supercell as both triclinic and orthorhombic forms of BiNiO 3 , where a is the lattice constant of a cubic perovskite, the magnetic component is evident from the intensities of NPD peaks.…”

Orthorhombic Phase of La0.5Bi0.5NiO3 Studied by First Principles

“…1. According to the sketch, La ions may occupy the following Bi positions: (1,3,6,8), (2,4,6,8), (4,5,6,8), (1,2,3,4), (3,5,6,8) or (2,5,6,8). Moreover, four types of magnetic ordering at Ni cations sites are considered for the studied orthorombic phase: an ferromagnetic (FM) one and three antiferromagnetic (A-, C-, and G-AFM) ones.…”

“…Much efforts has been focused on BiNiO 3 proved to undergo a phase transition accompanied by the charge redistribution between Bi and Ni ions [3,4,6,7]. In ambient conditions, BiNiO 3 in triclinic structure (P-1) displays the antiferromagnetic insulating ground state (G-type AFM, T N =300 K) [8], as well as exhibits an unusual charge distribution of Bi . This charge disproportionation (CD) can be suppressed by applying an external pressure of several GPa or substituting Bi sites partially with La, which turns the system into the orthorhombic (Pbnm) metallic phase [10].…”