EXPANSION OF THE CLUSTER GLASS REGIME BY Fe SUBSTITUTION IN (GdyY1-y) (FexAl1-x)2

La0.7Ba0.3Mn1-xFexO3 (x = 0 and 0.02) were prepared by using solid state synthesis method to investigate the effect of Fe3+ substitution at Mn-site on electrical behaviour and structural properties. An analysis of X-ray diffraction, XRD data using refinement method shown both x = 0 and x = 0.02 samples were in single phased and crystallized in rhombohedral structural with Pnma space group. From ρ vs T curves shown resistivity decreased under increased of applied current of 10 mA to 20 mA for both samples in the temperature range of 20 K-300 K. The larger electroresistance, ER effect observed for x = 0.02 in temperature range of 20 K – 180 K compared to x = 0 sample is suggested due to the development of filamentary conduction path under increased of applied current. It is suggested that Fe substitution enhanced magnetic inhomogeneity which contribute to the growth of formation of conductive path under increased of applied current, lead to increase of ER effect. In the temperature range of 180 K – 300 K, the observed decreased in ER for Fe substituted sample (x = 0.02) is suggested due to the increased of scattering effect and reduction of available hopping site in metallic region and insulating region, respectively. Restriction in the movement of charge carrier had weakened the ER effect for Fe substituted sample. The observed ER effect indicates the compound has a potential for application such as for non-volatile memory elements.

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Electronic structure modification in Fe substituted β-Ga2O3 from resonant photoemission and soft x-ray absotption spectroscopies

Journal of Physics D Applied Physics ◽

10.1088/1361-6463/ac43dc ◽

2021 ◽

Author(s):

Sahadeb Ghosh ◽

Mangala Nand ◽

Rajiv Kamparath ◽

Mukul Gupta ◽

Devdatta M Phase ◽

...

Keyword(s):

Thin Films ◽

Photoelectron Spectroscopy ◽

Rf Magnetron Sputtering ◽

Binding Energies ◽

Transfer System ◽

Structure Modification ◽

X Ray ◽

Resonant Photoemission ◽

A Charge ◽

Fe Substitution

Abstract Oriented thin films of β-(Ga1-xFex)2O3 have been deposited by RF magnetron sputtering on c-Al2O3 and GaN substrates. The itinerant character of Fe 3d states forming the top of the valence band (VB) of Fe substituted of β-Ga2O3 thin films has been determined from resonant photoelectron spectroscopy (RPES). Further, admixture of itinerant and localized character of these Fe 3d sates is obtained for larger binding energies i.e deeper of VB. The bottom of the conduction band (CB) for β-(Ga1-xFex)2O3 is also found to be strongly hybridized states involving Fe 3d and O 2p states as compared to that of Ga 4s in pristine β-Ga2O3. This suggests that β-Ga2O3 transforms from band like system to a charge transfer system with Fe substitution. Furthermore, the bandgap red shits with Fe composition, which has been found to be primarily related to the shift of the CB edge.

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Measurement of the magnetocaloric properties ofCoMn0.95Fe0.05Si: Large change with Fe substitution

Physical Review B ◽

10.1103/physrevb.78.134418 ◽

2008 ◽

Vol 78 (13) ◽

Cited By ~ 27

Author(s):

K. Morrison ◽

Y. Miyoshi ◽

J. D. Moore ◽

A. Barcza ◽

K. G. Sandeman ◽

...

Keyword(s):

Large Change ◽

Magnetocaloric Properties ◽

Fe Substitution

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Al-for-Fe substitution in hematite: the effect of low Al concentrations in the Raman spectrum of Fe2O3

Journal of Raman Spectroscopy ◽

10.1002/jrs.1811 ◽

2007 ◽

Vol 39 (1) ◽

pp. 40-46 ◽

Cited By ~ 73

Author(s):

A. Zoppi ◽

C. Lofrumento ◽

E. M. Castellucci ◽

Ph. Sciau

Keyword(s):

Raman Spectrum ◽

Fe Substitution

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The reduction of cycling capacity degradation of Mg–Ni-based electrode alloys by Fe substitution

International Journal of Hydrogen Energy ◽

10.1016/s0360-3199(01)00182-3 ◽

2002 ◽

Vol 27 (5) ◽

pp. 501-506 ◽

Cited By ~ 14

Author(s):

Y Zhang

Keyword(s):

Capacity Degradation ◽

Fe Substitution

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The Influence of Fe Substitution in Lanthanum Calcium Cobalt Oxide on the Oxygen Evolution Reaction in Alkaline Media

Journal of The Electrochemical Society ◽

10.1149/2.1311609jes ◽

2016 ◽

Vol 163 (9) ◽

pp. F1124-F1132 ◽

Cited By ~ 10

Author(s):

Maria A. Abreu-Sepulveda ◽

Chetan Dhital ◽

Ashfia Huq ◽

Ling Li ◽

Craig A. Bridges ◽

...

Keyword(s):

Cobalt Oxide ◽

Oxygen Evolution ◽

Oxygen Evolution Reaction ◽

Alkaline Media ◽

Calcium Cobalt Oxide ◽

Fe Substitution

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EXAFS unraveling of the Fe substitution sites in high anisotropic nanocrystallinePrCo,Fe3

Journal of Magnetism and Magnetic Materials ◽

10.1016/j.jmmm.2018.10.033 ◽

2019 ◽

Vol 473 ◽

pp. 253-261

Author(s):

T. Bartoli ◽

K. Zehani ◽

J. Moscovici ◽

A. Michalowicz ◽

L. Bessais

Keyword(s):

Fe Substitution

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A model of Fe3+-kaolinite, Al3+-goethite, Al3+-hematite equilibria in laterites

Clay Minerals ◽

10.1180/claymin.1989.024.1.01 ◽

1989 ◽

Vol 24 (1) ◽

pp. 1-21 ◽

Cited By ~ 37

Author(s):

F. Trolard ◽

Y. Tardy

Keyword(s):

Stability Field ◽

Equilibrium Conditions ◽

Dissolved Silica ◽

Silica Activity ◽

Proposed Model ◽

Coexisting Phases ◽

Activity Temperature ◽

The Stability ◽

Fe Substitution ◽

Mineral Constituents

AbstractThe distribution of Fe3+-kaolinite, Al-goethite and Al-hematite and their contents of Fe and Al in bauxites and ferricretes are controlled by water activity, dissolved silica activity, temperature and particle size. The proposed model, based on ideal solid-solution equilibria in the Fe2O3-Al2O3-SiO2-H2O system, takes into account water and silica activities. By using the same considerations as those previously developed for the Fe2O3-Al2O3-H2O system, the model calculates the amounts of coexisting phases, Al or Fe substitution ratios in goethite, hematite or kaolinite, and the stability field distributions of the minerals under various conditions. Thermodynamic equilibrium conditions and element distributions within the mineral constituents are shown to be dependent on the parameters cited above. The model yields results compatible with natural observations on lateritic profiles.

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