On the sol–gel synthesis and structure, optical, magnetic and impedance behaviour of strontium cobaltite powder

Jaiswal, Shivendra Kumar; Kumar, Jitendra

doi:10.1016/j.jallcom.2010.12.125

Cited by 34 publications

(24 citation statements)

References 47 publications

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“…Notice that the pattern at 27°C can be indexed on the basis of perovskite-type cubic unit cell with lattice parameter a = 3.8650 Å (as discussed −δ as secondary phase has been reported earlier, too [22][23][24]. [22]. The split in the cubic 110 peak is indicative of orthorhombic phase formation with oxygen vacancy ordering, as reported earlier in SrCo 0.4 Fe 0.6 O 3−δ produced via solid state reaction method [27].…”

Section: Phase Changes With Temperaturesupporting

confidence: 65%

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On the structural stability and oxygen permeation behavior of inorganic SrCo0.8Fe0.2O3−δ membranes

Kashyap

Jaiswal

Kumar

2016

Ionics

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The high oxygen permeability combined with reasonable structural stability of perovskite-type ABO 3−δ compounds is vital for their potential applications in gas separation, solid oxide fuel cells, sensors, etc. Hence, an attempt is made to develop SrCo 0.8 Fe 0.2 O 3−δ -based dense membranes with sol-gel-derived oxalates and study their phase stability and oxygen permeation. While X-ray diffraction confirms the presence of a perovskite-type cubic phase above 800°C, Xray photoelectron spectroscopy reveals the presence of cobalt and iron in 3+ and 4+ oxidation states with O 2 2− , O 2 − and O − species. The electrical conductivity increases up to a characteristic temperature and decreases slowly thereafter via pronounced carrier scattering. A 1.5-mm-thick membrane disp l a y s r e a s o n a b l e o x y g e n p e r m e a b i l i t y o f 1.05 × 10 −6 mol cm −2 s −1 at 900°C but has inadequate stability. Partial substitution of iron with zirconium is shown to improve permeability and stability significantly. Thus, SrCo 0.8 Fe 0.15 Zr 0.05 O 3−δ membrane shows promise for oxygen permeation purposes.

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Section: Phase Changes With Temperaturesupporting

confidence: 65%

“…5. Notice that the pattern at 27°C can be indexed on the basis of perovskite-type cubic unit cell with lattice parameter a = 3.8650 Å (as discussed −δ as secondary phase has been reported earlier, too [22][23][24]. [22].…”

Section: Phase Changes With Temperaturementioning

confidence: 66%

On the structural stability and oxygen permeation behavior of inorganic SrCo0.8Fe0.2O3−δ membranes

Kashyap

Jaiswal

Kumar

2016

Ionics

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“…It is clear that the magnitude of Z decreases with increasing the applied frequency. The high value at low frequencies is due to the total polarization caused by space charge, dipoles, ions and electrons [14]. At lower frequencies, the Z value is decreased with increasing temperature, as shown in the inset of Fig.…”

Section: Resultsmentioning

confidence: 83%

Impedance Spectroscopy of Nanostructure p-ZnGa₂Se₄/n-Si Heterojunction Diode

et al. 2011

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The impedance characteristics of the nanostructure p-ZnGa2Se4/n-Si heterojunction diode were investigated by impedance spectroscopy method in the temperature range (303-503 K) and the frequency range (42 Hz -5 MHz). The real and imaginary parts of the complex impedance are changed with the frequency. Both are decreased with increasing temperature at the lower frequencies and are merged at the higher frequencies. The dielectrical relaxation mechanism of the diode was analyzed by the Cole-Cole plots. The Cole-Cole plots under various temperatures exhibit one relaxation mechanism. With increasing temperature, the radius of the Cole-Cole plots decreases, which suggests a mechanism of temperature-dependent on relaxation.

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“…The existence of the absorption band near 0.9 eV connected with the d-d transitions in Co ions was reported, for example, in Ref. [30].…”

Section: Samples and Experimental Detailsmentioning

confidence: 77%

IR absorption and linear dichroism in BiFe0.5Co0.5O3 films

et al. 2015

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The optical density spectra D(hx) of BiFe 0.5-Co 0.5 O 3 films with thickness d = 230 and 1400 nm on LaAlO 3 substrate were studied in the infrared range from 0.09 to 1.65 eV in unpolarized and linear polarized light at room temperature and at T = 80 K in the magnetic field of 4.5 kOe and without the field. The absorption bands at hx *0.2 and *0.7 eV are revealed in the D(hx) spectra recorded in unpolarized light and attributed to combination of two-phonon and two-magnon absorption and to dd transitions in Fe or Co ions, respectively. In the D(hx) spectra of BiFe 0.5 Co 0.5 O 3 film with d = 230 nm recorded in linear polarized light, the additional bands in the range of 0.3 eV-1.0 eV are found and explained by the nonuniform charge state due to the existence of weakly conductive electric domains and domain walls with higher conductivity and by the scattering of the light on the domains. The position of the bands in the optical density spectra in polarized light D \ (hx) and D jj (hx) depends on the direction of the magnetic field relative to the film and on the temperature, which is explained by the change of the electric domain sizes. The revealed dependence of the optical properties on the magnetic field direction allows recommending BiFe 0.5 Co 0.5 O 3 films as new functional magneto-optical material.

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On the sol–gel synthesis and structure, optical, magnetic and impedance behaviour of strontium cobaltite powder

Cited by 34 publications

References 47 publications

On the structural stability and oxygen permeation behavior of inorganic SrCo0.8Fe0.2O3−δ membranes

On the structural stability and oxygen permeation behavior of inorganic SrCo0.8Fe0.2O3−δ membranes

Impedance Spectroscopy of Nanostructure p-ZnGa₂Se₄/n-Si Heterojunction Diode

IR absorption and linear dichroism in BiFe0.5Co0.5O3 films

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On the sol–gel synthesis and structure, optical, magnetic and impedance behaviour of strontium cobaltite powder

Cited by 34 publications

References 47 publications

On the structural stability and oxygen permeation behavior of inorganic SrCo0.8Fe0.2O3−δ membranes

On the structural stability and oxygen permeation behavior of inorganic SrCo0.8Fe0.2O3−δ membranes

Impedance Spectroscopy of Nanostructure p-ZnGa2Se4/n-Si Heterojunction Diode

IR absorption and linear dichroism in BiFe0.5Co0.5O3 films

Contact Info

Product

Resources

About

Impedance Spectroscopy of Nanostructure p-ZnGa₂Se₄/n-Si Heterojunction Diode