Neutron and X-ray diffraction studies of certain doped nickel ferrites

Effect of cobalt substitution on structural, magnetic and electric properties of nickel ferrite

“…1). The results obtained by X-ray diffraction (XRD) are in good agreement with the JCPDS card (22-1086) [11] and JCPDS card (74-2081) [12]. From Fig.…”

Na, Mg, Ni and Cs distribution and speciation after long-term alteration of a simulated nuclear waste glass: A micro-XAS/XRF/XRD and wet chemical study

“…For the Si(1 1 1) crystals, the K-edge inflection point of metallic Ag (E 0 = 3351 eV), which was brought on the sample in the form of tiny orientation marks, was used. Fitting and modelling of the Ni-K EXAFS spectra were carried out with FEFF 8.20 (Rehr et al, 1991) using the XRD structures of talc (Gruner, 1934) and trevorite (Subramanyam, 1971) as starting models. Radial structure functions (RSF) of the Ni K-edge l-EXAFS spectra were obtained by Fourier transformation (FT) of the k 3 -weighted v(k) functions over the range of 1.9-12.4 Å À1 (location A2) and 1.9-11.2 Å À1 (location T2) using a Kaiser-Bessel window and a smoothing parameter of four.…”

“…Based on the previously discussed l-XRD data, we attempted to fit the T2 l-EXAFS spectrum using trevorite as model structure (Subramanyam, 1971). The results of our best fit, shown in Table 2 and Fig.…”

“…N, coordination number; R, interatomic distance; r 2 , Debye-Waller factors; DE 0 , energy shift; S 0 , amplitude reduction factor. DN, DR deviation from N, R in the XRD model structure of trevorite (Subramanyam, 1971). …”

Growth of Nanoscale Nickel Ferrite on Carbonaceous Matrix- A Novel Method of Turning Harmful Particulates into a Functional Nanocomposite: An XAFS Study

“…In b-NFO, an inverted spinel, the Ni atom resides in the octahedral site, the mean Ni-O distance being 2.04 Å. In its second shell, Ni has 12 neighbors, comprising of 6Ni and 6Fe atoms, at 2.954 Å and in the third shell it has 6Fe atoms at 3.457 Å [40]. Consequently the first three RSF peaks of the composites, which coincide with the corresponding peaks in b-NFO, were assigned to Ni-O, Ni-(Ni/Fe) and Ni-Fe shells, respectively (Fig.…”