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Study of the free energy of the manganites based on the temperature dependence of the crystal cell volume
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10.1063/1.3233934
/content/aip/journal/apl/95/12/10.1063/1.3233934
http://aip.metastore.ingenta.com/content/aip/journal/apl/95/12/10.1063/1.3233934

Figures

Image of FIG. 1.
FIG. 1.

Calculated and experimental temperature dependences of the equivalent cubic cell lattice constant in the perovskite manganites (025), (050) reported by Radaelli et al. (Ref. 6) and (020), (030) reported by Hibble et al. (Ref. 10).

Tables

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Table I.

Effective ion radius (Å) and related radius sum (ion, ) (Å) for the given number of nearest-neighbors.

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Table II.

Parameters used in fitting the temperature dependence of the equivalent cubic cell lattice constant for the manganites . The parameters , , and are the coefficient for adjusting the powers ratio in the Pauli repulsion term, the DE energy coefficient, and the thermal activation energy for SPs, respectively. The Curie temperature , Debye temperature and Madelung constant are also listed in the Table.

Generic image for table
Table III.

Energies (eV) corresponding to the minimum average free energy per equivalent cubic cell for the manganite . Here is the ionic Coulomb energy, and are the additional energies produced by DE carriers and the thermal activation small polarons, respectively, is the Pauli repulsion energy, and is free energy corresponding to the thermal vibration of the crystal lattice.

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/content/aip/journal/apl/95/12/10.1063/1.3233934
2009-09-23
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Study of the free energy of the La1−xCaxMnO3 manganites based on the temperature dependence of the crystal cell volume
http://aip.metastore.ingenta.com/content/aip/journal/apl/95/12/10.1063/1.3233934
10.1063/1.3233934
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