Cation distribution of titanium substituted cobalt ferrites

Room temperature ferroelectric and magnetic investigations and detailed phase analysis of Aurivillius phase Bi5Ti3Fe0.7Co0.3O15 thin films

“…It is likely that the Ti content of the phase influences the size of the unit cell, thereby increasing the lattice parameter of the spinel phase. 38 The d-spacing of the (311) peak in the electron diffraction pattern of the Fe/Co-rich inclusions also matches with the peak at 2 theta ¼ 35.2 noted in the x-ray diffraction pattern. We can thus calculate the spinel content of the BTF7C3O thin film by direct comparison of the integrated intensity of the spinel (311) reflection in the x-ray diffraction pattern with the integrated intensity of the (200) [42][43][44] We estimate on this basis that the volume fraction of the spinel phases in the BTF7C3O thin film detected by the XRD instrumentation is 1.22 Â 10…”

Crystallographic and magnetic identification of secondary phase in orientated Bi5Fe0.5Co0.5Ti3O15 ceramics

“…This redistribution has been shown to be possible for CoFe 2Àx Ti x O 4 . 13 Moreover, the impurity phase cannot be detected using XRD, even under very slow scan rates around the angles expected for the most intense diffraction peaks.…”

Valence of Ti cations and its effect on magnetic properties of spinel ferrites TixM1−xFe2O4(M = Co, Mn)

“…Many studies were carried out on the magnetic moment of and cation distribution in Ti-doped spinel ferrites. [12][13][14][15][16] In these investigations, all of the Ti cations were assumed to be tetravalent, but there have been disputes regarding the cation distribution. Dwivedi et al prepared a series of samples, Co(Fe 1Àx Ti x ) 2 O 4 (x ¼ 0, 0.05, or 0.1), by conventional solidphase reactions; using X-ray photoelectron spectroscopy (XPS) they discovered that all Ti cations went into the octahedral sites.…”