Coexistence pressure for a martensitic transformation from theory and experiment: Revisiting the bcc-hcp transition of iron under pressure

@article{Zarkevich2014CoexistencePF,
  title={Coexistence pressure for a martensitic transformation from theory and experiment: Revisiting the bcc-hcp transition of iron under pressure},
  author={Nikolai A. Zarkevich and Duane D. Johnson},
  journal={Physical Review B},
  year={2014},
  volume={91},
  pages={174104}
}
The coexistence pressure of two phases is a well-defined point at fixed temperature. In experiment, however, due to nonhydrostatic stresses and a stress-dependent potential energy barrier, different measurements yield different ranges of pressure with a hysteresis. Accounting for these effects, we propose an inequality for comparison of the theoretical value to a plurality of measured intervals. We revisit decades of pressure experiments on the $\text{bcc}\ensuremath{\leftrightarrow}\text{hcp… 

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References

SHOWING 1-10 OF 45 REFERENCES

Equations of State

Diffraction experiments at high pressures provide measurement of the variation of the unit-cell parameters of the sample with pressure and thereby the variation of its volume (or equivalently its

Equations of State

Equations of State identify which intermolecular interactions are significant (including estimating relative strengths of dipole moments, polarizability, etc.) and develop expressions for the critical property data of a species.

High-pressure science and technology--1993

These proceedings represent papers presented at the joint meeting of the International Association for Research and Advancement of High Pressure Science and Technology and the American Physical

Mineral Physics of Earth Core : Iron Alloys at Extreme Condition

Mineral physics and high-pressure crystallography research provide crucial information on the enigmatic properties of the Earth’s interior and is motivating multidisciplinary efforts to re-evaluate

Earth as a Planet

Earth has been referred by several names as Tellus (the Roman goddess of Earth and a symbol of fertility), Gaia (ancient Greek Earth goddess) and Terra, from the Latin meaning Earth. Earth is the