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Nature of ferroelectric to paraelectric phase transition in multiferroic ceramics
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10.1063/1.3428410
/content/aip/journal/jap/107/10/10.1063/1.3428410
http://aip.metastore.ingenta.com/content/aip/journal/jap/107/10/10.1063/1.3428410

Figures

Image of FIG. 1.
FIG. 1.

The observed (dots), calculated (continuous line), and difference (bottom curve) plots for BF–0.2PFN obtained after full pattern Rietveld refinement. The vertical tick marks peak positions.

Image of FIG. 2.
FIG. 2.

Evolution of the XRD profiles with temperature: (a) 111 pseudocubic reflection and (b) the 220 pseudocubic reflection. The arrows in (b) indicate the cubic peak positions coexisting with the rhombohedral peaks.

Image of FIG. 3.
FIG. 3.

Observed (dots), calculated (continuous line), and difference (bottom curve) profiles for a few selected pseudocubic reflections (111, 200, 210, and 220) obtained after full pattern refinements using different space groups and structural models proposed in the literature. Vertical tick marks are the peak positions.

Image of FIG. 4.
FIG. 4.

Evolution of the XRD profile in the range 20° to 32° and 35.2° to 48° at various temperatures 300, 873, 898, 923, 948, 973, and 998 K. Asterisk indicates the 311 superlattice peak of the space group. The bottom most profile corresponds to simulated pattern of BF using space group and the structural parameters given in Ref. 16.

Image of FIG. 5.
FIG. 5.

Observed (dots), calculated (continuous line), and difference (bottom line) profiles for selected pseudocubic reflections(111, 200, 210, and 220) obtained after full pattern refinements by using , , and structural models. Vertical tick marks are the peak positions.

Image of FIG. 6.
FIG. 6.

Evolution of the unit cell parameters as a function of temperature. Inset shows small change in unit cell volume at the magnetic phase transition temperature .

Tables

Generic image for table
Table I.

Results of the Rietveld refinement of BF–0.2PFN at 300 K (, , , , , , and ).

Generic image for table
Table II.

Results of the Rietveld refinement of BF–0.2PFN at 1023 K by using , , , and space groups.

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/content/aip/journal/jap/107/10/10.1063/1.3428410
2010-05-24
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Nature of ferroelectric to paraelectric phase transition in multiferroic 0.8BiFeO3–0.2Pb(Fe1/2Nb1/2)O3 ceramics
http://aip.metastore.ingenta.com/content/aip/journal/jap/107/10/10.1063/1.3428410
10.1063/1.3428410
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