Abstract
A novel size dependent FCC (face-centered-cubic) → HCP (hexagonally-closed-pack) phase transformation and stability of an initial FCC zirconium nanowire are studied. FCC zirconium nanowires with cross-sectional dimensions <20 Å are found unstable in nature, and they undergo a FCC → HCP phase transformation, which is driven by tensile surface stress induced high internal compressive stresses. FCC nanowire with cross-sectional dimensions >20 Å, in which surface stresses are not enough to drive the phase transformation, show meta-stability. In such a case, an external kinetic energy in the form of thermal heating is required to overcome the energy barrier and achieve FCC → HCP phase transformation. The FCC-HCP transition pathway is also studied using Nudged Elastic Band (NEB) method, to further confirm the size dependent stability/metastability of Zr nanowires. We also show size dependent critical temperature, which is required for complete phase transformation of a metastable-FCC nanowire.
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Sutrakar, V.K., Roy Mahapatra, D. Size and temperature dependent stability and phase transformation in single-crystal zirconium nanowire. J Nanopart Res 13, 5335–5346 (2011). https://doi.org/10.1007/s11051-011-0519-4
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DOI: https://doi.org/10.1007/s11051-011-0519-4