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High-temperature, high-pressure Raman spectra and their intrinsic anharmonic effects in the perovskite
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10.1063/1.4772721
/content/aip/journal/jap/113/1/10.1063/1.4772721
http://aip.metastore.ingenta.com/content/aip/journal/jap/113/1/10.1063/1.4772721

Figures

Image of FIG. 1.
FIG. 1.

Selection of some Raman spectra showing the dependence of PLT Raman modes as a function of (a) the La-composition at T = 8 K and atmospheric pressure, (b) the temperature at atmospheric pressure (2.5% La sample), and (c) the hydrostatic pressure applied to the 2.5% La sample and at room temperature.

Image of FIG. 2.
FIG. 2.

Raman frequencies of PLT (2.5% La) at room temperature for different values of applied pressure. The dotted lines represent linear fittings for the vibrational modes.

Image of FIG. 3.
FIG. 3.

Effect of temperature and pressure in the full width at half maximum (FWHM) in the Raman modes from the samples PLT. Figure depicts variations of the FWHM of Raman bands with temperature (a), or with applied pressure (b).

Image of FIG. 4.
FIG. 4.

Low-frequency region of the Raman spectra for the 2.5% La sample. Observe the mode softening evolution and the redshift of E1(TO) with increasing applied hydrostatic pressure.

Tables

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Table I.

Average thermal expansion coefficient (TEC) of , as obtained from data reported by Chen et al. 1 The La datum for the 2.5% sample was extrapolated.

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Table II.

Calculated values of , and the Grüneisen parameter for all active Raman modes and lanthanum concentrations of 0.0%, 2.5%, and 5%. Temperatures larger than 290 K were used to fit at constant (atmospheric) pressure. The thermal expansion coefficient is shown in Table I . 1

Generic image for table
Table III.

Calculated values of , and the Grüneisen parameter for all active Raman modes and lanthanum concentrations of 10%, 15%, and 20%. Temperatures larger than 290 K were used to fit at constant (atmospheric) pressure. The thermal expansion coefficient is shown in Table I . 1

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Table IV.

Calculated values of , and the Grüneisen parameter , at room temperature, for all active Raman modes and lanthanum concentrations of 0.0%, 2.5%, and 5%. Bulk moduli were either taken from the literature ( ), 5 or calculated using the lattice parameters obtained by Mota. 14

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Table V.

Calculated values of , and the Grüneisen parameter , at room temperature, for all active Raman modes and lanthanum concentrations of 10%, 15%, and 20%. Bulk modulus for a 10% La concentration was calculated using the lattice parameters obtained by Mota 14 at T = 150 K, assuming that these parameters are the same at room temperature.

Generic image for table
Table VI.

Coefficients at constant volume. Explicit contribution of anharmonicity.

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/content/aip/journal/jap/113/1/10.1063/1.4772721
2013-01-04
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: High-temperature, high-pressure Raman spectra and their intrinsic anharmonic effects in the perovskite Pb1−xLaxTiO3
http://aip.metastore.ingenta.com/content/aip/journal/jap/113/1/10.1063/1.4772721
10.1063/1.4772721
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