Paraelectric Elastic Properties of Reduced and Heterovalently Doped BaTiO3 Single Crystals Studied by Using Brillouin Spectroscopy
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The effects of rhodium (Rh) doping on the elastic properties and phase transition behaviors of reduced BaTiO3 single crystals were investigated in the paraelectric phase by using Brillouin spectroscopy. The Rh doping induced changes in the elastic stiffness coefficients and the elastic anisotropy parameter. The degree of softening of (C11 − C12)/2 became more substantial with Rh doping, indicating that the polarization fluctuations were enhanced by heterovalent Rh3+ doping. This was supported by the much larger temperature range over which the nonzero birefringence was observed. Free charge carriers introduced by Rh doping and oxygen vacancies in the reduced BaTiO3 and their interactions with the lattice seem to be the origin of these anomalous changes in the elastic properties.
KeywordsBarium titanate Rh doping Elastic constants Brillouin scattering
PACS numbers77.80.−e 77.65.-Dq 78.35.+C
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This work was supported by the Hallym University Research Fund, 2019 (HRF-201907-013).