Strong correlation between structural, magnetic and transport properties of non-stoichiometric Sr2FexMo2−xO6 (0.8≤x≤1.5) double perovskites

Markandeya, Y.; Koppoju, Suresh; Bhikshamaiah, G.

doi:10.1016/j.jallcom.2011.06.108

Cited by 22 publications

(8 citation statements)

References 26 publications

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“…Recently, many efforts have been made to study the structural and magnetic properties of Sr 2 Fe 1þx Mo 1Àx O 6 , À1 ≤ x ≤ 1, compounds by varying Fe and Mo contents. [6,[52][53][54][55][56][57][58][59][60] Fe and Mo nonstoichiometry in SFMO is mainly accommodated by forming Fe Mo and Mo Fe as AS defects. [6] Such AS defects create both Fe-O-Fe Mo and Mo-O-Mo Fe nearest-neighbor pairs, which affect the electronic and magnetic properties.…”

Section: Iron-molybdenum Ratiomentioning

confidence: 99%

“…[6] For Sr 2 Fe 1þx Mo 1Àx O 6 compounds, it has been found that the values of S, M s , and MR are highest at x ¼ 0 and are decreasing as x deviates from 0. [6,[52][53][54]56,58,59] The predicted spin polarization decreases with ASD and nonstoichiometry, in the latter case moderate at Mo-excess (x ¼ À0. 25), but drastically at Fe-excess (x ¼ 0.25).…”

Section: Iron-molybdenum Ratiomentioning

confidence: 99%

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Challenges in Sr₂FeMoO_6−δ Thin Film Deposition

Suchaneck

Каланда

Artsiukh

et al. 2019

Physica Status Solidi (b)

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This work reviews some fundamental issues that are relevant for the fabrication of stable‐phase strontium ferromolybdate thin films. The main challenges for strontium ferromolybdate thin film deposition arise from the sensitivity of the material's magnetic properties to point defect formation: i) Antisite defect formation and oxygen nonstoichiometry should be avoided by precise composition control during film manufacturing; ii) a highly ordered state of the correct phase and B‐site cation valence will be obtained only in a very narrow window of growth conditions; iii) to avoid additional antisite disorder with decreasing synthesis temperature, the effective temperature at the film surface should be increased by an energy flux to the growing film surface. Since thin film deposition is nonequilibrium in nature, the review starts with the consideration of equilibrium phase stability. Cation and oxygen stoichiometries are analyzed with regard to their effect on key magnetic properties. Film strain formed due to thermal and lattice mismatch is of great concern since it influences the choice of the substrate. Finally, thin film deposition techniques are valued for their benefits in strontium ferromolybdate thin film technology.

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Section: Iron-molybdenum Ratiomentioning

confidence: 99%

Section: Iron-molybdenum Ratiomentioning

confidence: 99%

Challenges in Sr₂FeMoO_6−δ Thin Film Deposition

Suchaneck

Каланда

Artsiukh

et al. 2019

Physica Status Solidi (b)

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“…x Mo 2−x O 6 (x = 0.8, 1.0, 1.2, 1.3 and 1.4) (SFMO) powders were synthesized by the solgel method using AR grade Sr(NO 3 ) 2 , Fe(NO 3 ) 3 •9H 2 O and H 2 MoO 4 . The details of the synthesis of the SFMO powders are given in earlier publications 7,8 from this laboratory. The powders of SFMO were pressed into pellets of dimensions 25 mm × 6m m× 6 mm using a dies under a pressure of 5 t m −2 .…”

Section: Different Composition Of Sr 2 Fementioning

confidence: 99%

“…Especially double perovskite oxide Sr 2 FeMoO 6 doped with several elements were extensively studied for magnetoresistance and magnetization. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] This compound crystallizes in tetragonal lattice with space group I4/mmm. 1 The structure of Sr 2 FeMoO 6 can be viewed as a regular arrangement of corner-sharing FeO 6 and MoO 6 octahedra, alternating along the three directions of the crystal with the Sr cations occupying the voids in between the octahedra.…”

Section: Introductionmentioning

confidence: 99%

Characterization and thermal expansion of Sr2Fe x Mo2−x O6 double perovskites

et al. 2015

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Double perovskite oxides Sr 2 Fe x Mo 2−x O 6 (x = 0.8, 1.0, 1.2, 1.3 and 1.4) (SFMO) of different compositions were prepared by sol-gel growth followed by annealing under reducing atmosphere conditions of H 2 /Ar flow. X-ray powder diffraction studies revealed that the crystal structure of the samples changes from tetragonal to cubic at around x = 1.2. Lattice parameters and unit cell volume of these samples found to decrease with the increase in Fe content. The characteristics absorption bands observed in the range 400-1000 cm −1 of Fourier transform infrared spectra indicate the presence of FeO 6 and MoO 6 octahedra and confirm the formation of double perovskite phase. The value of g ∼ 2.00 obtained from electron spin resonance studies indicates that Fe is in 3+ ionic state in the SFMO samples. Dilatometric studies of these samples reveal that the average value of coefficient of thermal expansion (α) increases with the increase in temperature or Fe content in SFMO samples. The low value of coefficient of thermal expansion 1.31 × 10 −6 • C −1 obtained for Sr 2 Fe 0.8 Mo 1.2 O 6 in the present study in the temperature range of 40-100 • C makes it useful as anode material in fuel cells. The coefficient of thermal expansion (α) and the unit cell volume (V) of SFMO samples vary inversely with composition in agreement with Grüneisen relation.

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“…In view of this, a number of experimental studies were directed to change this degree of ordering of Fe/Mo cations and their oxidation state. These experimental studies included: doping at the A site,7–9 doping at Fe or Mo sites,10–12 and changing the Fe/Mo ratio 13–16. It is possible to shift from the oxidized form (Fe 3+ –Mo 6+ ) to the reduced form (Fe 2+ –Mo 5+ ) when the Fe/Mo ratio takes the limit values of 2 and 0.5, respectively, in A 2 Fe 1– x Mo 1+ x O 6 stoichiometries.…”

Section: Introductionmentioning

confidence: 99%

Coexistence of Localized and Itinerant Electrons in the Double‐Perovskite Ba₂Fe_2/3Mo_4/3O₆

et al. 2014

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A polycrystalline Ba2Fe2/3Mo4/3O6 double‐perovskite has been prepared by decomposition of citrate precursors and subsequent thermal treatment under a reducing atmosphere. The crystal structure has been studied by combined X‐ray and neutron powder diffraction (XRPD and NPD). At room temperature, the structure is cubic (Fm$\bar {3}$m) with lattice parameter a = 8.0710(1) Å. It is unchanged between 3 and 320 K. The crystallographic formula is Ba2[Fe0.52(2)Mo0.48(2)]4a[Fe0.14(2)Mo0.86(2)]4bO5.9(2). NPD, electron spin resonance (ESR), and magnetization measurements show spontaneous magnetization below the Curie temperature (TC) = 310 K. The ESR behavior is associated with the presence of localized Fe3+ ions, whereas the transport properties (electrical conductivity and Seebeck effect) suggest the presence of highly correlated electrons in a metallic band with disorder, which can be associated with the Mo t2g electrons. The coexistence of localized and itinerant electrons leads to non‐negligible magnetoresistance properties.

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Strong correlation between structural, magnetic and transport properties of non-stoichiometric Sr2FexMo2−xO6 (0.8≤x≤1.5) double perovskites

Cited by 22 publications

References 26 publications

Challenges in Sr₂FeMoO_6−δ Thin Film Deposition

Challenges in Sr₂FeMoO_6−δ Thin Film Deposition

Characterization and thermal expansion of Sr2Fe x Mo2−x O6 double perovskites

Coexistence of Localized and Itinerant Electrons in the Double‐Perovskite Ba₂Fe_2/3Mo_4/3O₆

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Strong correlation between structural, magnetic and transport properties of non-stoichiometric Sr2FexMo2−xO6 (0.8≤x≤1.5) double perovskites

Cited by 22 publications

References 26 publications

Challenges in Sr2FeMoO6−δ Thin Film Deposition

Challenges in Sr2FeMoO6−δ Thin Film Deposition

Characterization and thermal expansion of Sr2Fe x Mo2−x O6 double perovskites

Coexistence of Localized and Itinerant Electrons in the Double‐Perovskite Ba2Fe2/3Mo4/3O6

Contact Info

Product

Resources

About

Challenges in Sr₂FeMoO_6−δ Thin Film Deposition

Challenges in Sr₂FeMoO_6−δ Thin Film Deposition

Coexistence of Localized and Itinerant Electrons in the Double‐Perovskite Ba₂Fe_2/3Mo_4/3O₆