Magnetic studies of Sn2+–Sn4+-substituted barium hexaferrites synthesized by mechanical alloying

González-Ángeles, Alvaro; Mendoza-Suárez, G.; Grusková, A.; Dosoudil, Rastislav; Ortega-Zempoalteca, R.

doi:10.1016/j.matlet.2004.05.017

Cited by 15 publications

(8 citation statements)

References 8 publications

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“…The diffraction peaks shifted to higher 2θ angle with respect to BaSnO 3 although the ionic radius of La 3+ (0.136 nm) is smaller than that of Ba 2+ (0.161 nm) in 12-fold coordination [18]. This results in an expansion of the unit cell volume (0.08%) and simply can be attributed to ions Sn 2+ (0.112 nm) [19] generated by a charge compensating process. La-doped BaSnO 3 is a n-type SC with mixed valence states containing, at least formally a mixture of Sn 4+ and Sn 2+ as required by the electro neutrality condition.…”

Section: Resultsmentioning

confidence: 93%

The transport and photo electrochemical properties of La-doped stannate BaSnO3

Hadjarab

Bouguelia

Benchettara

et al. 2008

Journal of Alloys and Compounds

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Section: Resultsmentioning

confidence: 93%

The transport and photo electrochemical properties of La-doped stannate BaSnO3

Hadjarab

Bouguelia

Benchettara

et al. 2008

Journal of Alloys and Compounds

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“…The grain size is well below 1 μm at x=0.3. The Mössbauer spectra of BaM Sn-Sn ferrites are analysed in [9]. With the x rising, the site of 12k was splitting to 12k and 12k′ and this may be connected with changes in proximity of neighbouring Fe 3+ ions in 12k, if the substitution is performed in R block.…”

Section: Resultsmentioning

confidence: 99%

“…Co-Sn substituted BaM is a new kind of very promising particulate material for magnetic recording [7]. The different cationic combinations with Sn 4+ ions were tested in our earlier research works [8,9]. The goal of this paper is to compare the micro-structural and magnetic parameters of hexaferrites having substituted pairs of Sn 4+ ions with Sn 2+ , Ni 2+ or Zn 2+ ions, prepared by mechanical milling and the citrate precursor methods.…”

Section: Introductionmentioning

confidence: 99%

Magneto-crystalline properties of BaFe12−2x M x Sn x O19 (M = Sn, Ni, Zn) ferrite powders

et al. 2006

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BaFe 12−2x M x Sn x O 19 compounds, where M=Sn 2+ , Ni 2+ or Zn 2+ ions, were synthesized by mechanical milling and partially by citrate precursor methods. Analysis of magneto-crystalline structure has been carried out by Mössbauer spectroscopy. The Sn 4+ ions replace Fe 3+ ions on 2b and slightly on 2a+4f 1 sites, Zn 2+ ions strongly prefer 4f 1 sites, Sn 2+ ions prefer 4f 1 sites too and Ni 2+ ions occupy 4f 2 and 12k or 2a sites. The magnetic properties were evaluated by the vibrating sample magnetometry and the thermomagnetic analysis. A large variation of the intrinsic coercivity H c (330 to 78 kA/m) and of temperature coefficient of coercivity of ΔH c /Δϑ (0.39 to 0.22 kA/m°C) were achieved as a function of the (Zn-Sn) and (Sn-Sn) substitutions, respectively. The Curie temperature T c decreased with the (Ni-Sn) substitution from 447 to 399°C.

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“…The ionic radius of La 3+ (1.36Å) is smaller than Ba 2+ (1.61Å) in 12-fold coordination, as such lattice constant slightly increases with 2% La-doped BaSnO 3 when compared to undoped BaSnO 3 . 23,24 Hadjarab et al proposed that the partial reduction of Sn 4+ (0.69Å) to Sn 2+ (1.12Å) in the octahedral site induced by Ladoping could increase the lattice constant. 25 Until now no studies have been reported on utilizing this material as anode for oxide-ion conducting SOFCs.…”

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confidence: 99%

Stannate-Based Ceramic Oxide as Anode Materials for Oxide-Ion Conducting Low-Temperature Solid Oxide Fuel Cells

Hussain

Pan

Robinson

et al. 2016

J. Electrochem. Soc.

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Lanthanum-doped barium stannate, Ba 0.98 La 0.02 SnO 3 (LBS) ceramic oxide was developed as an alternative redox stable anode material for oxide-ion conducting, low-temperature solid oxide fuel cells (350-650 • C). LBS with ZnO as a sintering aid exhibited a high electronic conductivity of 216 S/cm at 650 • C under reducing gas conditions. A flexural strength of ∼66 MPa at 550 • C was obtained for ZnO-doped LBS; further investigation revealed that it can withstand 10 reduction-oxidation and thermal cycles. The performance of ZnO-doped LBS as an anode was determined with a GDC based electrolyte-supported SOFC. The catalytic activity for hydrogen oxidation and oxide conductivity was introduced by infiltration of Ni-GDC precursor. The maximum power densities of 0.28 W/cm 2 (at 0.6 A/cm 2 ) and 0.17 W/cm 2 (at 0.36 A/cm 2 ) was achieved at 650 and 600 • C, respectively, in humidified hydrogen as fuel for 2 wt% ZnO-doped LBS.

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Magnetic studies of Sn2+–Sn4+-substituted barium hexaferrites synthesized by mechanical alloying

Cited by 15 publications

References 8 publications

The transport and photo electrochemical properties of La-doped stannate BaSnO3

The transport and photo electrochemical properties of La-doped stannate BaSnO3

Magneto-crystalline properties of BaFe12−2x M x Sn x O19 (M = Sn, Ni, Zn) ferrite powders

Stannate-Based Ceramic Oxide as Anode Materials for Oxide-Ion Conducting Low-Temperature Solid Oxide Fuel Cells

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