Synchrotron X-Ray Powder Diffraction Study of (Bi,Pb)1.64Sr1.43Ca1.57Mn2O 9, Mn-Analogue of BSCCO-2212 Superconductor

M. Catti; D. Levy; G. Artioli

doi:10.1006/jssc.1999.8404

Synchrotron X-Ray Powder Diffraction Study of (Bi,Pb)_1.64Sr_1.43Ca_1.57Mn₂O ₉, Mn-Analogue of BSCCO-2212 Superconductor

M. Catti, D. Levy, G. Artioli

Research output: Contribution to journal › Article › peer-review

Abstract

The orthorhombic Mn-2212 phase, with nominal composition BiPbSr_1.8CaMn_2.1O₉, was synthesized by solid state reaction. Synchrotron X-ray powder diffraction data (λ=0.9359 Å) were collected at Brookhaven National Laboratory (U.S.A.) and used for a structure Rietveld refinement (a=5.3314(3), b=5.3697(2), c=31.067(2) Å). Convergence was obtained in space groups Fmmm, Amaa, and Abmm (Z=4) with the same agreement indexes (wR_p=0.0216, R_p=0.0158, R(F²)=0.0419). The two lower symmetry structure models correspond to different descriptions of partial ordering of oxygen atoms in the (Bi,Pb)-O layer. Refined site occupancies indicate a phase composition close to (Bi_1-yPb_y)_1.64(Sr_0.33Ca _0.67)₂(Sr_0.77Ca_0.23)Mn ₂O₉, with y between 0.4 and 0.5. This result, coupled with electroneutrality requirements, leads to an estimated Mn oxidation state of 3.8 e. Unlike in Cu-2212, an O atom is present in the (Sr,Ca) plane between adjacent Mn-O layers, producing a distorted octahedral (instead of pyramidal) coordination of Mn.

Original language	English
Pages (from-to)	501-508
Number of pages	8
Journal	Journal of Solid State Chemistry
Volume	147
Issue number	2
DOIs	https://doi.org/10.1006/jssc.1999.8404
State	Published - 1 Nov 1999
Externally published	Yes

Bibliographical note

Funding Information:
The experiment at Brookhaven National Laboratory was supported by contract DE-AC02-76CH00016 with US DOE by its Division of Chemical Science O$ce of Basic Energy Sciences. The National Research Council (C.N.R.), Italy, is gratefully acknowledged for "nancial support and for the use of the A.R.L. microprobe at the Centro di Studio per la Geodinamica Alpina e Quaternaria (Milano, Italy). We thank Luca Toia and Francesco Moneta for their help with the synthesis of the compound studied in this work.

Funding

The experiment at Brookhaven National Laboratory was supported by contract DE-AC02-76CH00016 with US DOE by its Division of Chemical Science O$ce of Basic Energy Sciences. The National Research Council (C.N.R.), Italy, is gratefully acknowledged for "nancial support and for the use of the A.R.L. microprobe at the Centro di Studio per la Geodinamica Alpina e Quaternaria (Milano, Italy). We thank Luca Toia and Francesco Moneta for their help with the synthesis of the compound studied in this work.

Funders	Funder number
Basic Energy Sciences

Keywords

BiPbSrCaMnO
Powder diffraction
Rietveld refinement
Superconductors
Synchrotron X rays

Access to Document

10.1006/jssc.1999.8404

Cite this

@article{d03e3400285f4b30b481986c399f17bb,

title = "Synchrotron X-Ray Powder Diffraction Study of (Bi,Pb)1.64Sr1.43Ca1.57Mn2O 9, Mn-Analogue of BSCCO-2212 Superconductor",

abstract = "The orthorhombic Mn-2212 phase, with nominal composition BiPbSr1.8CaMn2.1O9, was synthesized by solid state reaction. Synchrotron X-ray powder diffraction data (λ=0.9359 {\AA}) were collected at Brookhaven National Laboratory (U.S.A.) and used for a structure Rietveld refinement (a=5.3314(3), b=5.3697(2), c=31.067(2) {\AA}). Convergence was obtained in space groups Fmmm, Amaa, and Abmm (Z=4) with the same agreement indexes (wRp=0.0216, Rp=0.0158, R(F2)=0.0419). The two lower symmetry structure models correspond to different descriptions of partial ordering of oxygen atoms in the (Bi,Pb)-O layer. Refined site occupancies indicate a phase composition close to (Bi1-yPby)1.64(Sr0.33Ca 0.67)2(Sr0.77Ca0.23)Mn 2O9, with y between 0.4 and 0.5. This result, coupled with electroneutrality requirements, leads to an estimated Mn oxidation state of 3.8 e. Unlike in Cu-2212, an O atom is present in the (Sr,Ca) plane between adjacent Mn-O layers, producing a distorted octahedral (instead of pyramidal) coordination of Mn.",

keywords = "BiPbSrCaMnO, Powder diffraction, Rietveld refinement, Superconductors, Synchrotron X rays",

author = "M. Catti and D. Levy and G. Artioli",

note = "Funding Information: The experiment at Brookhaven National Laboratory was supported by contract DE-AC02-76CH00016 with US DOE by its Division of Chemical Science O$ce of Basic Energy Sciences. The National Research Council (C.N.R.), Italy, is gratefully acknowledged for {"}nancial support and for the use of the A.R.L. microprobe at the Centro di Studio per la Geodinamica Alpina e Quaternaria (Milano, Italy). We thank Luca Toia and Francesco Moneta for their help with the synthesis of the compound studied in this work.",

year = "1999",

month = nov,

day = "1",

doi = "10.1006/jssc.1999.8404",

language = "אנגלית",

volume = "147",

pages = "501--508",

journal = "Journal of Solid State Chemistry",

issn = "0022-4596",

publisher = "Academic Press Inc.",

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TY - JOUR

T1 - Synchrotron X-Ray Powder Diffraction Study of (Bi,Pb)1.64Sr1.43Ca1.57Mn2O 9, Mn-Analogue of BSCCO-2212 Superconductor

AU - Catti, M.

AU - Levy, D.

AU - Artioli, G.

N1 - Funding Information: The experiment at Brookhaven National Laboratory was supported by contract DE-AC02-76CH00016 with US DOE by its Division of Chemical Science O$ce of Basic Energy Sciences. The National Research Council (C.N.R.), Italy, is gratefully acknowledged for "nancial support and for the use of the A.R.L. microprobe at the Centro di Studio per la Geodinamica Alpina e Quaternaria (Milano, Italy). We thank Luca Toia and Francesco Moneta for their help with the synthesis of the compound studied in this work.

PY - 1999/11/1

Y1 - 1999/11/1

N2 - The orthorhombic Mn-2212 phase, with nominal composition BiPbSr1.8CaMn2.1O9, was synthesized by solid state reaction. Synchrotron X-ray powder diffraction data (λ=0.9359 Å) were collected at Brookhaven National Laboratory (U.S.A.) and used for a structure Rietveld refinement (a=5.3314(3), b=5.3697(2), c=31.067(2) Å). Convergence was obtained in space groups Fmmm, Amaa, and Abmm (Z=4) with the same agreement indexes (wRp=0.0216, Rp=0.0158, R(F2)=0.0419). The two lower symmetry structure models correspond to different descriptions of partial ordering of oxygen atoms in the (Bi,Pb)-O layer. Refined site occupancies indicate a phase composition close to (Bi1-yPby)1.64(Sr0.33Ca 0.67)2(Sr0.77Ca0.23)Mn 2O9, with y between 0.4 and 0.5. This result, coupled with electroneutrality requirements, leads to an estimated Mn oxidation state of 3.8 e. Unlike in Cu-2212, an O atom is present in the (Sr,Ca) plane between adjacent Mn-O layers, producing a distorted octahedral (instead of pyramidal) coordination of Mn.

AB - The orthorhombic Mn-2212 phase, with nominal composition BiPbSr1.8CaMn2.1O9, was synthesized by solid state reaction. Synchrotron X-ray powder diffraction data (λ=0.9359 Å) were collected at Brookhaven National Laboratory (U.S.A.) and used for a structure Rietveld refinement (a=5.3314(3), b=5.3697(2), c=31.067(2) Å). Convergence was obtained in space groups Fmmm, Amaa, and Abmm (Z=4) with the same agreement indexes (wRp=0.0216, Rp=0.0158, R(F2)=0.0419). The two lower symmetry structure models correspond to different descriptions of partial ordering of oxygen atoms in the (Bi,Pb)-O layer. Refined site occupancies indicate a phase composition close to (Bi1-yPby)1.64(Sr0.33Ca 0.67)2(Sr0.77Ca0.23)Mn 2O9, with y between 0.4 and 0.5. This result, coupled with electroneutrality requirements, leads to an estimated Mn oxidation state of 3.8 e. Unlike in Cu-2212, an O atom is present in the (Sr,Ca) plane between adjacent Mn-O layers, producing a distorted octahedral (instead of pyramidal) coordination of Mn.

KW - BiPbSrCaMnO

KW - Powder diffraction

KW - Rietveld refinement

KW - Superconductors

KW - Synchrotron X rays

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