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|Title:||Oxygen Nonstoichiometry Study of LaSr3Fe3O10 in the Temperature Range 25-650°C|
|Authors:||PROKHNENKO O.; VELINOV N.; KOZHUKHAROV V.; NEOV S.; DABROWSKI L.|
|Other Contributors:||NEOV Dimitar|
|Citation:||Bulgarian Journal of Physics vol. 34 no. S1 p. 219-225|
|Publisher:||Heron Press Ltd.|
|Type:||Articles in periodicals and books|
|Abstract:||Neutron diffraction method has been applied to study structure-to conductivity changes of Ruddlesden-Popper phase LaSr3Fe3O10 in the temperature range 25 - 650°C. Structure parameters have been obtained by Rietveld analysis of high-resolution neutron diffraction spectra. Experimental data shows that the structure symmetry of LaSr3Fe3O10 is tetragonal, space group I4/mmm, and persists from ambient temperature to 650°C. The thermal expansion of a and b-axes is linear, while c-axis shows small positive deviation from linearity. The oxygen content decreases from 9.8 at room temperature to 9.4 at 650°C. The loss of oxygen is attended by bonds length changes mainly in the triple-perovskite layers of the structure. It has been established that part of the interatomic Fe-O and La(Sr)-O distances decrease with increasing temperature and as a result, the thickness of the inner layer formed by FeO6 octahedra decreases from 3.83Angstrom at 25°C to 3.69Angstrom at 650°C.|
|JRC Institute:||Institute for Energy and Transport|
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