1887
banner image
No data available.
Please log in to see this content.
You have no subscription access to this content.
No metrics data to plot.
The attempt to load metrics for this article has failed.
The attempt to plot a graph for these metrics has failed.
Structural and magnetic properties of self-doped perovskite manganites La0.8- x Sr0.2MnO3− δ
Rent:
Rent this article for
USD
10.1063/1.3671635
/content/aip/journal/jap/110/12/10.1063/1.3671635
http://aip.metastore.ingenta.com/content/aip/journal/jap/110/12/10.1063/1.3671635

Figures

Image of FIG. 1.
FIG. 1.

XRD patterns for the samples with nominal composition La0.8- x Sr0.2MnO3− δ . The main diffraction peaks of the Mn3O4 phase are marked by the symbol “↓”. The inset shows an enlarged portion of the same diagram.

Image of FIG. 2.
FIG. 2.

Results for the XRD pattern for the samples C1 (a) and C5 (b) corresponding to x = 0.00 and 0.20 following the second Rietveld fitting. Here, “+” represents the experimental intensity I obs. The bottom line shows the difference between the experimental and fitted curve I obsI cal. Panel (c) shows the results for the XRD pattern for sample C5 based on the assumptions there are vacancies at the A sites.

Image of FIG. 3.
FIG. 3.

Curves for the specific magnetization σ of the samples La0.8- x Sr0.2MnO3− δ versus the magnetic field at 10 K.

Image of FIG. 4.
FIG. 4.

Curves of the specific saturation magnetization σ STV, σ ST, σ SO versus the doping level x. Here, σ SO is the experimental value, and σ ST and σ STV are calculated values based on the assumptions there are Mn2+ ions or vacancies at the A sites of perovskite phase, respectively.

Image of FIG. 5.
FIG. 5.

Curves for the specific magnetization σ of the samples with nominal composition La0.8- x Sr0.2MnO3− δ versus temperature at an applied field of 0.05 T (a), and curves of dσ/dT versus temperature (b). The arrows in (b) indicate the values of T C.

Image of FIG. 6.
FIG. 6.

Dependence of the Curie temperature T C, Mn–O–Mn bond angles Θ, and Mn–O bond lengths d on the doping level x (from bottom to top).

Tables

Generic image for table
Table I.

The volume averaged diameter D of the perovskite phase crystallites; the XRD main peak intensities I P and I M, of the perovskite phase and Mn3O4 phase in the samples with the nominal composition La0.8− x Sr0.2MnO3; the molar content y of Mn in Mn3O4 phase.

Generic image for table
Table II.

The molar contents of La3+, Sr2+, and Mn2+ at the A sites, Mn3+ and Mn4+ at B sites and O2− ions, designated L, S, M 2, M 3, M 4, and O 2, respectively, when the contents of the O2− ions are normalized to 3, as calculated by the second Rietveld fitting.

Generic image for table
Table III.

Rietveld refined results of the XRD patterns for the samples with nominal composition La0.8− x Sr0.2MnO3− δ (0.0 ≤ x ≤ 0.2), where W P(%) and W M(%) are the mass percentages of the perovskite phase and Mn3O4 phase; s is the goodness of fit indicator, R p is the profile factor, R wp is the weighted profile factor, a and c are lattice parameters, and V is the cell volume. The ions occupy the A site (0.00, 0.00, 0.25), the B site (0.00, 0.00, 0.00), and the O site (x O, 0.00, 0.25); d is the calculated Mn–O bond length, and Θ is the Mn–O–Mn bond angle.

Generic image for table
Table IV.

The observed specific saturation magnetization σ SO, the calculated value of the specific saturation magnetization σ ST calculated assuming that the Mn2+ ions are at A sites, and using the molar contents M 2, M 3, M 4 of Mn2+ at the A sites, Mn3+ and Mn4+ at the B sites, and the molar mass m P of the perovskite phase in the samples, when the contents of the O2− ions are normalized to 3. The mass percentage W P(%) of the perovskite phase is given in the final column.

Generic image for table
Table V.

The observed specific saturation magnetization σ SO, the calculated value of the specific saturation magnetization σ STV calculated assuming that there are vacancies are at A sites, using the molar contents V A, M 3, and M 4 of vacancies at the A sites, Mn3+ and Mn4+ at the B sites, and the molar mass m P of the perovskite phase in the samples, when the contents of the O2− ions are normalized to 3. The mass percentage W P(%) of the perovskite phase is given in the final column.

Loading

Article metrics loading...

/content/aip/journal/jap/110/12/10.1063/1.3671635
2011-12-23
2014-04-21
Loading

Full text loading...

This is a required field
Please enter a valid email address
752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Structural and magnetic properties of self-doped perovskite manganites La0.8-xSr0.2MnO3−δ
http://aip.metastore.ingenta.com/content/aip/journal/jap/110/12/10.1063/1.3671635
10.1063/1.3671635
SEARCH_EXPAND_ITEM