Effect of the internal pressure and the anti-site disorder on the structure and magnetic properties of ALaFeTiO6 (A=Ca, Sr, Ba) double perovskite oxides

Elbadawi, Abdelrahman A.; Yassin, O.A.; Gismelseed, A. M.

doi:10.1016/j.jmmm.2012.07.035

Cited by 19 publications

(18 citation statements)

References 19 publications

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“…Elbadawi et al [2013] have reported that the structure of SrLa ( also [see Fig.1 of Elbadawi et al, 2013]. This suggests that the consideration of lower symmetry phase is inevitable to account for the structure of SLFT.…”

Section: Structure Of Srla(feti)omentioning

confidence: 99%

“…The Rietveld fit of the XRD data of SLFT in the structural parameters of SLFT for Pnma space group are listed in Table I. Elbadawi et al [2013] have considered ordering of Fe/Ti ions at B-sites while refining the structure of SLFT using I4/m space group. We find that cations at both the A and B-sites are disordered in the structure and account very well the observed XRD pattern of SLFT when Pnma space group is used.…”

Section: Structure Of Srla(feti)omentioning

confidence: 99%

“…The overall fit is very good confirming the Pm3 m space group for BLFT. In case of BLFT also, Elbadawi et al [2013] have reported that Fe/Ti ions are ordered at the B-sites. The present work clearly shows that both the A and B-sites cations are disordered in the primitive perovskite structure with Pm3 m space group.…”

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confidence: 93%

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Investigation of crystal structure of SrLa(FeTi)O 6 and BaLa(FeTi)O 6 perovskites by rietveld refinement

Shankar

Agarwal

Pandey

et al. 2016

Solid State Sciences

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The structures of the recently reported ordered perovskites SrLa(FeTi)O 6 and BaLa(FeTi)O 6 have been revisited using Rietveld analysis of the powder x-ray diffraction data.Our studies clearly show that earlier authors have incorrectly reported the tetragonal structure in the I4/m space group for SrLa(FeTi)O 6 and the cubic structure in the Fm3 m space group for BaLa(FeTi)O 6 . The correct structure is found to be orthorhombic in the Pnma space group for SrLa(FeTi)O 6 while cubic in the Pm3 m space group for BaLa(FeTi)O 6 . Thus the BaLa(FeTi)O 6 is not an ordered double perovskite as the occupancies of Ba/La ions at A-site and Fe/Ti ions at B-site are disordered resulting in the primitive cubic unit cell in the Pm 3 m space group.Similarly, the occupancies of Sr/La ions at A-site and Fe/Ti ions at B-site are disordered in SrLa(FeTi)O 6 also, ruling out the ordered perovskite structure.

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Section: Structure Of Srla(feti)omentioning

confidence: 99%

Section: Structure Of Srla(feti)omentioning

confidence: 99%

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Investigation of crystal structure of SrLa(FeTi)O 6 and BaLa(FeTi)O 6 perovskites by rietveld refinement

Shankar

Agarwal

Pandey

et al. 2016

Solid State Sciences

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“…Tilting of the octahedral in SrLaFeTiO 6 , SrPrFeTiO 6 and SrNdFeTiO 6 leads to different electronic environment around the Fe ions and impose magnetic moments miss alignment. Therefore, the magnetic properties of these compounds might be influenced by the internal pressure [20]. Successful preparation of double perovskite oxides of chemical formula SrAFeTiO 6 (A = La, Pr or Nd) has been achieved by following the precursor method.…”

Section: Discussionmentioning

confidence: 99%

Effect of the Cation Size Disorder at the A-Site on the Structural Properties of SrAFeTiO<SUB>6</SUB> Double Perovskites (A = La, Pr or Nd)

Elbadawi¹,

Yassin²,

Siddig³

2015

MSCE

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In this paper, the cation size disorder effect of the A-site on the structural properties of the SrAFeTiO6 (A = La, Pr or Nd) was investigated. The compounds were synthesized-as the best of our knowledge-for the first time by conventional and precursor method to get crystalline materials. The results obtained from the experimental measurements carried out on new double perovskite materials were presented. The data of X-ray diffraction (XRD), Fourier Transform Infra Red FTIR were measured at room temperature. From the X-ray diffraction, and by means of standard Rietiveld method, all the samples have the same structure (orthorhombic) with Pnma space group. The difference in the tolerance factor is clearly noticed and refers to the cation size disorder at the A-sites. The Fourier Transform Infra Red FTIR measurement has been done; the results of it confirm the double perovskite structure and the difference between the samples were noticed. The tolerance factors for the samples altered from SrLaFeTiO6 up to SrNdFeTiO6 and this difference return to ionic radius and cation size effect.

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“…The ionic radii and valences of A‐site ions have a great effect on the physical properties of A 2 CoMnO 6 materials . For example, A‐site Bi‐doping can enhance the B‐site cation ordering in La 2 CoMnO 6 owing to the strong hybridization of the Bi‐6s orbital with the 2p orbital of its neighboring O, which can increase the total magnetic moment .…”

Section: Introductionmentioning

confidence: 99%

Electrical transport properties and enhanced magnetoresistance effect in double perovskite La_2–xCa_xCoMnO₆ (0 ≤ x ≤ 0.5)

Liu

2017

Physica Status Solidi (b)

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Polycrystalline La2–x Ca x CoMnO6 (0 ≤ x ≤ 0.5) samples were synthesized by the standard solid‐state reaction. The crystal structure of the samples was monoclinic perovskite structure with space group of P21/n at room temperature. All the samples show semiconducting‐like behavior and the nature of electrical conduction can be well described by Mott's three‐dimensional variable range hopping model. A large negative magnetoresistance effect is observed in all samples, which may be caused by the suppression of spin‐fluctuations by the magnetic field. A resistor network theory can be appropriate to explain the features of this magnetoresistance effect. Furthermore, the magnetoresistance effect could be regulated by the concentration of Ca2+ ions. The negative magnetoresistance effect of La1.8Ca0.2CoMnO6 can be enhanced to 56% at 120 K under 7 T.

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Effect of the internal pressure and the anti-site disorder on the structure and magnetic properties of ALaFeTiO6 (A=Ca, Sr, Ba) double perovskite oxides

Cited by 19 publications

References 19 publications

Investigation of crystal structure of SrLa(FeTi)O 6 and BaLa(FeTi)O 6 perovskites by rietveld refinement

Investigation of crystal structure of SrLa(FeTi)O 6 and BaLa(FeTi)O 6 perovskites by rietveld refinement

Effect of the Cation Size Disorder at the A-Site on the Structural Properties of SrAFeTiO<SUB>6</SUB> Double Perovskites (A = La, Pr or Nd)

Electrical transport properties and enhanced magnetoresistance effect in double perovskite La_2–xCa_xCoMnO₆ (0 ≤ x ≤ 0.5)

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Effect of the internal pressure and the anti-site disorder on the structure and magnetic properties of ALaFeTiO6 (A=Ca, Sr, Ba) double perovskite oxides

Cited by 19 publications

References 19 publications

Investigation of crystal structure of SrLa(FeTi)O 6 and BaLa(FeTi)O 6 perovskites by rietveld refinement

Investigation of crystal structure of SrLa(FeTi)O 6 and BaLa(FeTi)O 6 perovskites by rietveld refinement

Effect of the Cation Size Disorder at the A-Site on the Structural Properties of SrAFeTiO&lt;SUB&gt;6&lt;/SUB&gt; Double Perovskites (A = La, Pr or Nd)

Electrical transport properties and enhanced magnetoresistance effect in double perovskite La2–xCaxCoMnO6 (0 ≤ x ≤ 0.5)

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Effect of the Cation Size Disorder at the A-Site on the Structural Properties of SrAFeTiO<SUB>6</SUB> Double Perovskites (A = La, Pr or Nd)

Electrical transport properties and enhanced magnetoresistance effect in double perovskite La_2–xCa_xCoMnO₆ (0 ≤ x ≤ 0.5)