The melting parameter Gamma(m) of a classical one-component plasma is estimated using a relation between the melting temperature, density, shear modulus, and a crystal coordination number that follows from our model of dislocation-mediated melting. We obtain gamma(m)=172+/-35, in good agreement with the results of numerous Monte Carlo calculations.
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Nat Commun
May 2024
Center for X-mechanics, School of Aeronautics and Astronautics, Zhejiang University, Hangzhou, 310027, China.
Elastic stability is the basis for understanding structural responses to external stimuli in crystalline solids, including melting, incipient plasticity and fracture. In this work, elastic stability is investigated in a series of high-entropy alloys (HEAs) using in situ mechanical tests and atomic-resolution characterization in transmission electron microscopy. Under tensile loading, the HEA lattices are observed to undergo a sudden loss of ordering as the elastic strain reached ∽ 10%.
View Article and Find Full Text PDFPhys Rev Lett
August 2005
Department of Physics and Astronomy, The University of Kansas, Lawrence, KS 66045, USA.
We report an experimental investigation of the transition from a hexagonally ordered solid phase to a disordered liquid in a monolayer of vibrated spheres. The transition occurs as the intensity of the vibration amplitude is increased. Measurements of the density of dislocations and the positional and orientational correlation functions show evidence for a dislocation-mediated continuous transition from a solid phase with long-range order to a liquid with only short-range order.
View Article and Find Full Text PDFPhys Rev E Stat Nonlin Soft Matter Phys
June 2001
Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
The melting parameter Gamma(m) of a classical one-component plasma is estimated using a relation between the melting temperature, density, shear modulus, and a crystal coordination number that follows from our model of dislocation-mediated melting. We obtain gamma(m)=172+/-35, in good agreement with the results of numerous Monte Carlo calculations.
View Article and Find Full Text PDFScience
November 1997
Department of Chemistry, Tulane University, New Orleans, LA 70118, USA.
A distinctive two-dimensional (2D) melting transition occurring at nearly 100 degrees Celsius ( degrees C) has been observed in Langmuir-Blodgett films by in situ atomic force microscopy (AFM). A 2D orthorhombic crystal phase melted to a 2D smectic phase at about 91 degrees C. The smectic phase was characterized by 1D molecular periodicity with short-range correlations (about 40 angstroms).
View Article and Find Full Text PDFPhys Rev E Stat Phys Plasmas Fluids Relat Interdiscip Topics
March 1996
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