Pressure‐dependent Raman modes near the cubic‐tetragonal transition in strontium titanate

Kiraci, A.; Yurtseven, H.

doi:10.1111/jace.15279

Cited by 5 publications

(1 citation statement)

References 32 publications

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“…By following our recent work, 37 in this study the isothermal Grüneisen parameters of the observed 20 Raman modes in PZT ceramic (x ¼ 0:48) were determined by using the V-P relation 38 of this ceramic at room temperature close to the monoclinic-cubic phase transition pressure of P C ¼ 5 GPa. This V-P relation 38 for PZT ceramic (x ¼ 0:48) was also used to predict the isothermal compressibility κ T of this ceramic as a function of pressure up to the 17 GPa at T ¼ 298 K. By using the definition of the isothermal Grüneisen parameter γ T ðPÞ, the pressure dependences of the Raman shifts for the observed modes 20 in PZT ceramic studied have been calculated.…”

Section: Introductionmentioning

confidence: 99%

Raman wavenumbers calculated as a function of pressure from the mode Grüneisen parameter of PZT (x=0.48) ceramic close to the monoclinic-cubic transition

Kiraci

2019

J. Adv. Dielect.

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The isothermal mode Grüneisen parameter [Formula: see text] of some Raman modes in [Formula: see text]TixO3 (PZT, [Formula: see text]) were calculated as a function of pressure by means of the observed pressure-dependent volume data of PZT ([Formula: see text]) crystal from the literature at room temperature of 298[Formula: see text]K. Those calculated values of [Formula: see text] were then used to compute the pressure dependence of the Raman modes in PZT ([Formula: see text]) ceramic studied here. The observed and calculated values of the Raman wavenumbers in PZT were in good agreement, which indicates that the isothermal mode Grüneisen parameter can also be used to predict the pressure-dependent wavenumbers of some other perovskite-type crystals. Additionally, the pressure dependence of the thermodynamic quantities such as isothermal compressibility [Formula: see text], thermal expansion [Formula: see text] and the specific heat [Formula: see text] of PZT ([Formula: see text]) ceramic were predicted at constant temperature of 298[Formula: see text]K. Here, the experimentally measurable thermodynamic quantities calculated for PZT ([Formula: see text]) ceramics provide theoretically a significant opportunity for testing.

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Section: Introductionmentioning

confidence: 99%

Raman wavenumbers calculated as a function of pressure from the mode Grüneisen parameter of PZT (x=0.48) ceramic close to the monoclinic-cubic transition

Kiraci

2019

J. Adv. Dielect.

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A thermodynamic study on PbZr0.52Ti0.48O3 ceramic close to the tetragonal-cubic transition

Kiraci

2019

J Aust Ceram Soc

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Thermal conductivity of SrTiO3 under high-pressure

Zhang

Yuan

Zhu

et al. 2022

Applied Physics Letters

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Pressure is an effective way to regulate physical properties of ABO3 perovskites, such as thermal conductivity κ of SrTiO3, which can enhance fundamental understanding of structure–property relationships. In this Letter, κ of SrTiO3 was investigated up to ∼20 GPa using high-pressure time domain thermoreflectance together with Raman spectroscopy and first-principles calculations. Our theoretical predictions effectively explain the measured results. In both cubic and tetragonal phases, κ increased with compression, and optical phonons are the dominant heat carriers. The phonon group velocity and relaxation time make prominent contributions to κ with compression in the cubic phase, while the reduction in the anharmonicity of phonon modes and the phonon scattering channels dominates the increase in κ in the tetragonal phase. Especially, during the transition from cubic to tetragonal phases, there is a significant drop in κ, which originally results from the TiO6 octahedral distortion induced by the soft-phonon-mode, which markedly reduces the phonon group velocity. Our results not only help reveal the pressure effect on κ of complex oxides but also pave their way for applications on high-temperature superconductors and spin devices.

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Pressure‐dependent Raman modes near the cubic‐tetragonal transition in strontium titanate

Cited by 5 publications

References 32 publications

Raman wavenumbers calculated as a function of pressure from the mode Grüneisen parameter of PZT (x=0.48) ceramic close to the monoclinic-cubic transition

Raman wavenumbers calculated as a function of pressure from the mode Grüneisen parameter of PZT (x=0.48) ceramic close to the monoclinic-cubic transition

A thermodynamic study on PbZr0.52Ti0.48O3 ceramic close to the tetragonal-cubic transition

Thermal conductivity of SrTiO3 under high-pressure

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