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Ferroic phase transition in LaEr(MoO4)3

  • A. Hernández-Suárez (a1), C. Guzmán-Afonso (a2), J. López-Solano (a3), C. González-Silgo (a3), M. E. Torres (a1), N. Sabalisck (a1), E. Matesanz (a4) and J. Rodríguez-Carvajal (a5)...

Abstract

The ferroic phase transition in LaEr(MoO4)3 has been analyzed for the first time. It has been confirmed that this compound undergoes a phase transition from a tetragonal system (paraelectric-paraelastic phase), with space group P-421 m [β-Gd2(MoO4)3 averaged phase] to an orthorhombic system (ferroelectric-ferroelastic phase), with space group Pba2 [β'-Gd2(MoO4)3 phase] in a reversible process. This phenomenon, together with the observed demixing at high temperature has been studied using different techniques. LaEr(MoO4)3 samples have been obtained by the conventional solid-state synthesis. The thermal dependence of the crystal structure was studied by powder X-ray and neutron diffraction, following a new refining procedure in which the symmetry modes of atomic displacements from the paraelectric-paraelastic structure were analyzed. Dielectric spectroscopy measurements have confirmed the structural results, showing a very smooth phase transition. Finally, calculations within the framework of Density Functional Theory show a behavior of the lattice parameters similar to that observed in our experiments.

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a) Electronic mail: anahs84@hotmail.com

References

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Keywords

Ferroic phase transition in LaEr(MoO4)3

  • A. Hernández-Suárez (a1), C. Guzmán-Afonso (a2), J. López-Solano (a3), C. González-Silgo (a3), M. E. Torres (a1), N. Sabalisck (a1), E. Matesanz (a4) and J. Rodríguez-Carvajal (a5)...

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