Raman spectrum in PbTiO<sub>3</sub>re-examined: dynamics of the soft phonon and the central peak

Fontana, M.D.; Idrissi, Hassane; Kugel, G. E.; Wójcik, K.

doi:10.1088/0953-8984/3/44/014

Cited by 140 publications

(91 citation statements)

References 26 publications

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“…Labeling of the modes was done according to the results of the effective medium approximation fit in tetragonal PLZT 20 and Raman results on a single PbTiO 3 crystal. 35 Figure 2 shows the temperature dependences of the reflectivity spectra of three PZT samples (x = 0.42, 0.48, and 0.52) below 200 cm −1 . In this frequency range, the first band at high temperatures, in the cubic phase, corresponds to the Last mode.…”

Section: Resultsmentioning

confidence: 99%

Polar lattice vibrations and phase transition dynamics in Pb(Zr1–xTix)O3<

et al. 2011

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Infrared (IR) reflectivity spectra of nominally pure Pb(Zr 1-x Ti x )O 3 ceramics with different Ti/Zr concentration (x = 0.42-0.58) were measured and evaluated, along with the time-domain terahertz transmittance spectra in the temperature range 10 K-900 K. The temperature dependence of the low-frequency vibrations, related to Pb atoms, was analyzed in terms of two overdamped modes-a soft mode and an anharmonic hopping central mode-in the cubic and high-temperature ferroelectric phase and three main vibrations in the low-temperature ferroelectric phase with the doubled unit cell: two E-symmetry modes (the soft mode and a mode corresponding to antiphase vibrations of neighboring Pb atoms in the terahertz range) and the antiferrodistortive mode producing the antiphase tilts of the oxygen octahedra. The last bare mode is not IR active, but it becomes activated by coupling with the soft mode. As predicted by theory, the intrinsic permittivity of Pb(Zr 1-x Ti x )O 3 has a maximum at the morphotropic phase boundary, although this represents just a small percentage of the total permittivity at lower frequencies. Its maximum is linked to the softening of the anharmonic vibrations of Pb ions, perpendicular to the polarization, and shifts from x = 0.48 at room temperature to x = 0.52 at 10 K.

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Section: Resultsmentioning

confidence: 99%

Polar lattice vibrations and phase transition dynamics in Pb(Zr1–xTix)O3<

et al. 2011

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“…Only the A g ͑2͒ and B 3g ͑2͒ vibration modes shift to higher wavenumbers with doping, which can be explained by a two-phonon model. 26,27 …”

Section: B Raman Spectramentioning

confidence: 99%

Structure, magnetic, and thermal properties of Nd1−xLaxCrO3 (≤x≤1.0)

Cheng

Wang

et al. 2010

Journal of Applied Physics

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Perovskite-type Nd 1−x La x CrO 3 (0 ≤ x ≤1.0) polycrystalline samples were synthesized using solid state reaction. Structural studies indicate that the lattice parameters, metal-oxygen bond lengths, and angles of Nd 1−x La x CrO 3 strongly depend on the La content. Two magnetic transition temperatures, Cr 3+ antiferromagnetic ordering temperature (T N ) and the spin reorientation phase transition temperature (T SRPT ), have been observed in the M-T curves. The increase in T N and decrease in T SRPT with increasing x value can be explained by the change in the magnetic interactions due to La doping. The heat capacity of Nd 1−x La x CrO 3 measured from 2 to 300 K reveals that the lattice, electronic, and magnetic contributions to heat capacity can be well interpreted quantitatively using the Debye and Schottky models. The splitting energy of the Cr 3 + 3dt 2g orbital and the Nd 3+ ground state have been calculated by fitting to the Schottky anomaly at very low temperature. The Cr-Nd interaction is suppressed gradually by La doping, which is verified by the calculation of the mean-field interaction parameter. This doping dependence provides directed evidence of TM-RE magnetic interactions in perovskite compounds, in agreement with the proposed model. Perovskite-type Nd 1−x La x CrO 3 ͑0 Յ x Յ 1.0͒ polycrystalline samples were synthesized using solid state reaction. Structural studies indicate that the lattice parameters, metal-oxygen bond lengths, and angles of Nd 1−x La x CrO 3 strongly depend on the La content. Two magnetic transition temperatures, Cr 3+ antiferromagnetic ordering temperature ͑T N ͒ and the spin reorientation phase transition temperature ͑T SRPT ͒, have been observed in the M-T curves. The increase in T N and decrease in T SRPT with increasing x value can be explained by the change in the magnetic interactions due to La doping. The heat capacity of Nd 1−x La x CrO 3 measured from 2 to 300 K reveals that the lattice, electronic, and magnetic contributions to heat capacity can be well interpreted quantitatively using the Debye and Schottky models. The splitting energy of the Cr 3+ 3dt 2g orbital and the Nd 3+ ground state have been calculated by fitting to the Schottky anomaly at very low temperature. The Cr-Nd interaction is suppressed gradually by La doping, which is verified by the calculation of the mean-field interaction parameter. This doping dependence provides directed evidence of TM -RE magnetic interactions in perovskite compounds, in agreement with the proposed model.

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“…2. The four peaks of A 1 (1TO), E(2TO), B 1 þ E, and A 1 (2TO) are identified corresponding to the one reported for PT single crystals with those lying at 148 cm À1 , 220 cm À1 , 290 cm À1 , and 360 cm À1 , 33 which indicates that the local structure of the 0.2BMT-0.8PT thin films are the same to tetragonal perovskite. Note that there are three peaks at 110 cm À1 , 123 cm À1 , and 143 cm À1 below 150 cm À1 in Raman spectra of PT films.…”

Section: à2mentioning

confidence: 55%

Temperature-independent ferroelectric property and characterization of high-TC 0.2Bi(Mg1/2Ti1/2)O3-0.8PbTiO3 thin films

Zhang

Chen

Zhao

et al. 2013

Applied Physics Letters

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Ferroelectric property stability against elevated temperature is significant for ferroelectric film applications, such as non-volatile ferroelectric random access memories. The high-TC 0.2Bi(Mg1/2Ti1/2)O3-0.8PbTiO3 thin films show the temperature-independent ferroelectric properties, which were fabricated on Pt(111)/Ti/SiO2/Si substrates via sol-gel method. The present thin films were well crystallized in a phase-pure perovskite structure with a high (100) orientation and uniform texture. A remanent polarization (2Pr) of 77 μC cm−2 and a local effective piezoelectric coefficient d33* of 60 pm/V were observed in the 0.2Bi(Mg1/2Ti1/2)O3-0.8PbTiO3 thin films. It is interesting to observe a behavior of temperature-independent ferroelectric property in the temperature range of room temperature to 125 °C. The remanent polarization, coercive field, and polarization at the maximum field are almost constant in the investigated temperature range. Furthermore, the dielectric loss and fatigue properties of 0.2Bi(Mg1/2Ti1/2)O3-0.8PbTiO3 thin films have been effectively improved by the Mn-doping.

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Raman spectrum in PbTiO₃re-examined: dynamics of the soft phonon and the central peak

Cited by 140 publications

References 26 publications

Polar lattice vibrations and phase transition dynamics in Pb(Zr1–xTix)O3<

Polar lattice vibrations and phase transition dynamics in Pb(Zr1–xTix)O3<

Structure, magnetic, and thermal properties of Nd1−xLaxCrO3 (≤x≤1.0)

Temperature-independent ferroelectric property and characterization of high-TC 0.2Bi(Mg1/2Ti1/2)O3-0.8PbTiO3 thin films

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Raman spectrum in PbTiO3re-examined: dynamics of the soft phonon and the central peak

Cited by 140 publications

References 26 publications

Polar lattice vibrations and phase transition dynamics in Pb(Zr1–xTix)O3<

Polar lattice vibrations and phase transition dynamics in Pb(Zr1–xTix)O3<

Structure, magnetic, and thermal properties of Nd1−xLaxCrO3 (≤x≤1.0)

Temperature-independent ferroelectric property and characterization of high-TC 0.2Bi(Mg1/2Ti1/2)O3-0.8PbTiO3 thin films

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Product

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About

Raman spectrum in PbTiO₃re-examined: dynamics of the soft phonon and the central peak