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Lattice modes in paraelectric La1/2Na1/2TiO3 by infrared and Raman spectroscopy
F Borodavka1, E Simon, I Gregora
1Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, 182 21 Prague 8, Czech Republic.
Far-infrared and Raman spectroscopy reveal lattice dynamics in La(1/2)Na(1/2)TiO(3) single crystals. The study explains suppressed ferroelectricity and identifies a phase transition near 870 K.
Area of Science:
- Solid State Physics
- Materials Science
- Spectroscopy
Background:
- La(1/2)Na(1/2)TiO(3) is a perovskite material with potential applications.
- Understanding its lattice dynamics is crucial for explaining its physical properties, including ferroelectricity.
Purpose of the Study:
- To investigate the lattice dynamics of La(1/2)Na(1/2)TiO(3) single crystal.
- To correlate lattice dynamics with suppressed ferroelectricity.
- To identify phase transitions in the material.
Main Methods:
- Far-infrared (Far-IR) reflectivity spectroscopy.
- Raman scattering spectroscopy.
- Temperature-dependent measurements.
Main Results:
- Identified Slater, Last, and Axe modes using Far-IR spectroscopy.
- Observed a 10% decrease in Slater mode frequency upon cooling, correlating with increased low-frequency permittivity.
- Raman scattering indicated a second-order phase transition near 870 K towards the perovskite aristotype phase.
Conclusions:
- The observed lattice dynamics, particularly the Slater mode behavior, explain the suppressed ferroelectricity in La(1/2)Na(1/2)TiO(3).
- A second-order phase transition occurs near 870 K, impacting the material's structural and electrical properties.
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