Structural and magnetic properties of YBa2Fe3O7+x Fe-based 1-2-3 ceramic oxide

ElMassalami, M.; Elzubair, Amal; Ibrahim, Hanan Mosleh; Rizgalla, M.A.

doi:10.1016/0921-4534(91)90777-v

Cited by 20 publications

(6 citation statements)

References 32 publications

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“…It is worth mentioning here that in RBFO compounds, the PBFO showed a unique behavior in terms of Fe ordering temperature. 8,9 Particularly Fe moment orders around 700 K for all studied RBFO compounds, except PBFO, for which the same happens at around 290 K. The nearly linear ͑at high applied field͒ field dependence of the magnetization at 5 K ͑not shown͒, suggests that Fe sublattice order antiferromagnetically ͑AFM͒. The irreversibility probably arises from this AFM alignment of the Fe sublattice.…”

Section: B Magnetic Behaviormentioning

confidence: 88%

“…Also a unique behavior of PrBa 2 Fe 3 O 8 ͑PBFO͒, in terms of magnetic and thermal properties was observed in comparison to other R counter parts of the same formula. 8,9 RBFO compounds are more or less widely explored until now. [3][4][5][6][7][8][9] On the other hand for RSr 2 Fe 3 O 9 ͑RSFO͒, while the structural details are available for most of R members, 10 detailed magnetic measurements were reported recently only for LaSr 2 Fe 3 O 9 ͑LSFO͒.…”

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confidence: 99%

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Structural and magnetic properties of RSr2Fe3O9 (R=La, Y, Pr, and Gd)

Awana

Dou

Felner

et al. 1998

Journal of Applied Physics

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We have investigated the RSr2Fe3O9 (R=La, Y, Pr, and Gd) materials by several experimental techniques, including x-ray and neutron diffraction, magnetic susceptibility, and Mossbauer spectroscopy measurements. All materials studied are single phase and crystallize in the hexagonal perovskite structure. Magnetic susceptibility studies reveal that, for R=La and Pr, the Fe ions order antiferromagnetically at about TN=190 K. Short range magnetic correlations are observed up to 250 K. For R=La and Pr, Fe57 Mossbauer studies reveal two inequivalent magnetic sextets below 190 K, with the area ratio 2:1. Above TN, one singlet is observed with an isomer shift value typical to Fe4+. For R=Y and Gd, the magnetization curves do not lend themselves to easy determination of the magnetic transition due to an extra magnetic phase which exists up to 350 K. This phase is a result of deficiency of oxygen. The Mossbauer57 spectra at 300 K indicate two superimposed singlet lines, and contain a small magnetic sextet. There is no indication that the R sublattice in RSr2Fe3O9 (R=Pr and Gd) orders magnetically down to 1.5 K.

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Section: B Magnetic Behaviormentioning

confidence: 88%

mentioning

confidence: 99%

Structural and magnetic properties of RSr2Fe3O9 (R=La, Y, Pr, and Gd)

Awana

Dou

Felner

et al. 1998

Journal of Applied Physics

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“…These are the iron based materials R(Ba,Sr) 2 Fe 3 O 8 , R~Y, Dy, Ho, Er, 19,20 and the cobalt containing phase Y(Ba,K) 2 Co 3 O 7.9 . 21 YBa 2 Fe 3 O 8 was first reported in 1991 and, like YBCO, it exists in both tetragonal 19 and orthorhombic 22 forms depending on the synthesis conditions. Subsequent studies revealed that, unlike the cuprate materials, the lanthanide size has a large impact upon the structure, with triple perovskites only forming for Y and the lanthanides Dy, Ho and Er.…”

Section: Introductionmentioning

confidence: 99%

“…1, and the extension of high temperature superconductor chemistry to non-cuprate systems can be described analogously. In addition non-purely oxide systems, such as oxide carbonates and oxide borates, can often be derived structurally from cuprates by locally replacing units such as CuO 4 n2 by CO 3 22 and BO 3 32 . As these methods of describing the structures of complex cuprates have been so successful this review is categorised along similar lines.…”

Section: Introductionmentioning

confidence: 99%

New directions in synthetic and structural solid state chemistry: the legacy of high temperature superconductivity beyond cuprate chemistry

Weller

Knee

2001

J. Mater. Chem.

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The synthetic and structural chemistry of copper in complex oxides has developed extremely rapidly since the first reports of high temperature superconductivity in 1986. This progress in cuprate solid state chemistry has far outpaced that in many other areas of complex oxide chemistry. Significant new developments have included the formation of new complex oxides incorporating the volatile post transition oxides of Tl, Hg, Pb and Bi, the generation of complex structures based on stacked perovskites and/or other building blocks, the use of very high pressures during synthesis and the stabilisation of complex anions in oxides. Many of these advances are now being developed outside cuprate chemistry particularly with other late first row transition metals such as iron, nickel and cobalt. The aim of this article is not to review cuprate chemistry but to demonstrate where work on high T c superconductors has resulted in significant recent progress for other transitional metal oxide systems. The syntheses and structures of these new complex oxides are described and areas where developments, derived from the discoveries in cuprate chemistry, can be expected in the next decade are also proposed. Systems (1) Layered perovskitesThe major structural feature of a superconducting cuprate is the presence of a layer of stoichiometry CuO 2 formed from corner sharing square planar MO 4 units, square pyramidal MO 5 or, normally axially elongated, MO 6 octahedra, M~Cu.

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“…ompound YBa 2 Fe 3 O 8+w (YBFO) is an antiferromagnet (AFM) with Neel temperatures (T N ) around 660 K [1][2]. The crystal structure of YBFO is triple perovskite as it is formed by merging Y and Ba, and by disordering of the oxygen atoms and vacancies.…”

Section: Introductionmentioning

confidence: 99%

Ni doping effects in YBa2Fe3O8+w

2011

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(YBFNO, x=0, 0.05, 0.10, 0.15, 0.30, 0.50, 1.00). This paper discusses the changes in crystal structural, resistivity and magnetoresistivity (MR) of YBFO samples due to the incorporation of transition metal Ni. The results show that Ni substitution for partial Fe in YBFO does not substantially transform the structure of parent phase, but results in tiny changes in the lattice parameters. The YBFO crystal with Ni doped is semiconducting.

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Structural and magnetic properties of YBa2Fe3O7+x Fe-based 1-2-3 ceramic oxide

Cited by 20 publications

References 32 publications

Structural and magnetic properties of RSr2Fe3O9 (R=La, Y, Pr, and Gd)

Structural and magnetic properties of RSr2Fe3O9 (R=La, Y, Pr, and Gd)

New directions in synthetic and structural solid state chemistry: the legacy of high temperature superconductivity beyond cuprate chemistry

Ni doping effects in YBa2Fe3O8+w

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