| CONDENSED MATTER: STRUCTURE, MECHANICAL AND THERMAL PROPERTIES |
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Abnormal Elastic Changes for Cubic-Tetragonal Transition of Single-Crystal SrTiO$_{3}$ |
| Caizi Zhang1, Fangfei Li1, Xinmiao Wei1, Mengqi Guo1, Yingzhan Wei1, Liang Li1, Xinyang Li1*, and Qiang Zhou1,2 |
1State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China
2Synergetic Extreme Condition User Facility, Jilin University, Changchun 130012, China
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| Cite this article: |
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Caizi Zhang, Fangfei Li, Xinmiao Wei et al 2022 Chin. Phys. Lett. 39 096201 |
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Abstract Strontium titanate (SrTiO$_{3}$) is a typical perovskite-type ceramic oxide and studying its high-pressure phases are critical to understand the ferroelastic phase transition. SrTiO$_{3}$ also can be used as an important analog of davemaoite (CaSiO$_{3}$) to understand the compositional and velocity structure of the Earth's interior. However, the high-pressure studies on the cubic-to-tetragonal phase transition pressure and elastic properties remain unclear for SrTiO$_{3}$. Here, we investigate the phase transition and elasticity of single-crystal SrTiO$_{3}$ by Raman and Brillouin scattering combined with diamond anvil cell. The acoustic velocities of single-crystal SrTiO$_{3}$ and the independent elastic constants of cubic and tetragonal SrTiO$_{3}$ are determined up to 27.5 GPa at room temperature. This study indicates that $C_{11}$, $C_{12}$, and $C_{44}$ exhibit abnormal changes at 10.3 GPa, which is related to the cubic-to-tetragonal phase transition. Interestingly, a significant softening on shear modulus and a large anisotropy of shear wave splitting ($A_{\mathrm{S}}^{\mathrm{PO}}$) jump are observed at 10.3 GPa. Using obtained elastic constants, the coefficients of the Landau potential are calculated to understand the phase transition between cubic and tetragonal. The calculated coefficients of the Landau potential are, $\lambda_{2} = 3.12\times 10^{-2}$ GPa, $\lambda_{4} = -2.02 \times 10^{-2}$ GPa, $B^* = 1.34 \times 10^{-4}$ GPa and $B = 1.66\times 10^{-4}$ GPa. The elastic results have profound implications in understanding the structure of the Earth's interior and indicate that the presence of tetragonal Ti-bearing CaSiO$_{3}$ helps to explain the large $A_{\mathrm{S}}^{\mathrm{PO}}$ of the Earth's mid-mantle.
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Received: 25 June 2022
Editors' Suggestion
Published: 12 August 2022
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| PACS: |
62.50.-p
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(High-pressure effects in solids and liquids)
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62.65.+k
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(Acoustical properties of solids)
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64.60.-i
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(General studies of phase transitions)
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78.35.+c
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(Brillouin and Rayleigh scattering; other light scattering)
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