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An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
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Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
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Lattice Dynamics and Structural Phase Transitions in Eu2O3.

Jan Łażewski1, Małgorzata Sternik1, Paweł T Jochym1

  • 1Institute of Nuclear Physics, Polish Academy of Sciences, 31-342 Kraków, Poland.

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This study uses density functional theory to investigate europium sesquioxide (Eu2O3) phases. Computational results for structural and lattice dynamics align well with experimental data, aiding understanding of phase transitions.

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Computational Chemistry

Background:

  • Europium sesquioxide (Eu2O3) exhibits complex structural polymorphism.
  • Understanding its lattice dynamics is crucial for applications in optics and catalysis.
  • Experimental data on Eu2O3 properties often requires theoretical validation.

Purpose of the Study:

  • To computationally investigate the structural and lattice dynamical properties of Eu2O3.
  • To analyze the phase transitions between cubic, trigonal, and monoclinic structures.
  • To compare theoretical findings with experimental data for validation.

Main Methods:

  • Density Functional Theory (DFT) calculations were employed.
  • Lattice parameters, energies, and phonon density of states were computed.
  • Comparison with experimental data from Raman spectroscopy and nuclear inelastic scattering.

Main Results:

  • Calculated lattice parameters and Raman mode energies agree well with experimental values.
  • Eu-partial phonon density of states for cubic Eu2O3 matches nuclear inelastic scattering data.
  • Compressive strain from a YSZ substrate causes a spectral shift in experimental data.

Conclusions:

  • The study validates DFT as a reliable method for predicting Eu2O3 properties.
  • Lattice and phonon properties provide insights into the mechanisms of structural transitions.
  • Understanding strain effects is important for thin-film applications of Eu2O3.