Journal Article10.1063/1.4772721
High-temperature, high-pressure Raman spectra and their intrinsic anharmonic effects in the perovskite Pb1−xLaxTiO3
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TL;DR: In this paper, Chen et al. studied the Raman spectra of ferroelectric Pb1−xLaxTiO3 in the tetragonal phase of the material and for different La concentrations, for different temperatures and pressures.
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Abstract: Raman spectra of ferroelectric Pb1−xLaxTiO3, in the tetragonal phase of the material and for different La concentrations, were studied for different temperatures and pressures. While temperature was varied from 8 K to transition temperature (Tc) at atmospheric pressure, applied hydrostatic pressure was increased from zero to transition pressure (Pc) at room temperature. Isobaric and isothermal mode-Gruneisen parameters were calculated from the measured Raman spectra, and previously reported coefficients of thermal expansion [Chen et al., J. Am. Ceram. Soc. 88, 1356 (2005)] and bulk moduli. Also the coefficient of intrinsic anharmonicity was calculated. Although the absolute value of Gruneisen parameters strongly depends on the Raman mode under study, all of them grow as La concentration increases.
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Citations
The effect of the preparation method of Nb 2 O 5 oxide influences the performance of the photocatalytic activity
TL;DR: In this article, the experimental results of the photocatalytic properties evaluation of the niobium pentoxide under visible light irradiation were presented, where the nanoparticles structure of the samples were studied by X-ray diffraction, Brunauer-Emmett-Teller, Raman spectroscopy, UV-Vis and scanning and transmission electron microscopy.
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Raman scattering and photoluminescence investigation of YBO3:Eu3+ under high temperature and high pressure
TL;DR: In this article, Raman scattering, X-ray diffraction and photoluminescence spectra of YBO3:Eu3+ were measured at high temperatures up to 1323 K.
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Intrinsic anharmonicity effect in YCrO3: Pressure and temperature dependent Raman spectra studies
TL;DR: In this article, the structural stability and phonon modes of multiferroic oxide YCrO3 were investigated by Raman spectroscopy at temperatures from 100 to 600 K and under pressures up to 355 GPa.
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Pressure and temperature dependence of Raman scattering of MnWO4
TL;DR: In situ Raman spectra of MnWO4 have been measured at high pressures up to 29.4 GPa and temperatures up to 1473 K as discussed by the authors, and it is shown that a pressure-induced phase transition from the monoclinic to triclinic phase starts at about 17.7 GPa at room temperature, and the phase transition is confirmed to be reversible.
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The technique of Raman spectroscopy in the characterization physical, chemical and structural ferroelectric of the materials
Miryam R. Joya,J Barón-Jaimez,José José Barba-Ortega +2 more
- 07 Nov 2013
TL;DR: In this paper, Raman spectroscopy has been used extensively in the characterization of ferroelectric materials in particular of PbTiO3, which has been one of the most studied compounds in the literature both in obtaining the same growth as in behavior of chemical and physical properties.
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References
Giant tunnel electroresistance with PbTiO3 ferroelectric tunnel barriers
A. Crassous,A. Crassous,Vincent Garcia,Vincent Garcia,Karim Bouzehouane,Karim Bouzehouane,Stéphane Fusil,Stéphane Fusil,A. H. G. Vlooswijk,G. Rispens,Beatriz Noheda,Manuel Bibes,Manuel Bibes,Alain Barthélémy +13 more
TL;DR: In this paper, the authors used piezoresponse force microscopy and conductive-tip AF microscopy at room temperature to demonstrate the resistive readout of the polarization state through its influence on the tunnel current in PbTiO3 ultrathin ferroelectric films.
Elastic properties of tetragonal pbtio3 single crystals by brillouin scattering
TL;DR: In this paper, the authors used Brillouin light scattering to obtain the elastic and piezoelectric constants for tetragonal PbTiO3 single crystals at room temperature.
Pressure-temperature-La concentration three-dimensional phase diagram of La-modified PbTiO3 determined by Raman scattering
M. R. Joya,P. S. Pizani +1 more
TL;DR: A detailed Raman scattering study was performed on lanthanum-modified lead titanate (PLT) with compositions varying from pure PbTiO3 to La 20.0 at as mentioned in this paper.
Temperature dependence of volume expansion for solids
TL;DR: In this paper, an empirical relationship for temperature dependence of volume expansion is reported at atmosphere pressure for solids, and the solids MgO, CaO, Al2O3 and Mg2SiO4 are considered for the study.