Sound Velocities in Vanadium Reveal Complex Elastic Behavior at High Pressures
Compressional (V<sub>P</sub>) and shear (V<sub>S</sub>) wave velocities of polycrystalline vanadium were measured simultaneously up to 11.5 GPa at room temperature using ultrasonic interferometry in a multi-anvil press. Complex softening behavior in V<sub>S</sub>...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-04-01
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| Series: | Metals |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2075-4701/15/4/427 |
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| Summary: | Compressional (V<sub>P</sub>) and shear (V<sub>S</sub>) wave velocities of polycrystalline vanadium were measured simultaneously up to 11.5 GPa at room temperature using ultrasonic interferometry in a multi-anvil press. Complex softening behavior in V<sub>S</sub> and resulting shear moduli are discovered, possibly revealing a precursor to the reported phase transition within 30–60 GPa. The current data enables a comprehensive assessment of the elastic and mechanical properties of vanadium at high pressures, including bulk and shear moduli, Young’s modulus, Poisson’s ratio, and Pugh’s ratio. Through fitting to the 3rd-order finite strain equations, the elastic moduli and their pressure derivatives were determined to be K<sub>S0</sub> = 151 (2) GPa, G<sub>0</sub> = 46.9 (8) GPa, K’<sub>S0</sub> = 3.47 (5), and G’<sub>0</sub> = 0.62 (1). These experimental results allow us to compare with and benchmark the existing Steinberg–Guinan models for extrapolations to extreme pressure and temperature conditions. |
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| ISSN: | 2075-4701 |