11 papers · 1 filter
An approach to local band average for the temperature dependence of lattice thermal expansion
Chang Q. Sun
It has long been puzzling regarding the mechanism behind the nonlinearity of lattice thermal expansion at low temperatures despite modeling considerations from various perspectives…
Pressure-stiffened Raman Phonons in Group III Nitrides
Chang Q. Sun
It has long been puzzling regarding the atomistic origin of the pressure-induced Raman phonon stiffening that generally follows a polynomial expression with coefficients needing ph…
Thermally driven elastic weakening of crystals
Chang Q. Sun
An analytical solution has been developed clarifying that the thermally driven elastic softening of crystals can be directly related to the length and strength of the representativ…
The strongest size in the inverse Hall-Petch relationship
Chang Q. Sun
Incorporating the bond-order-length-strength correlation mechanism [Sun CQ, Prog Solid State Chem 35, 1 -159 (2007)] and Borns criterion for melting [J. Chem. Phys. 7, 591(1939)] i…
The thermo-mechanical behavior of low-dimensional materials
Chang Q Sun
Consistently atomistic understanding of the mechanism behind the intriguing behavior of low-dimensional systems including monatomic chains, hollow tubes, surface skins, nanocavitie…
Size-induced acoustic hardening and optic softening of Ramn phonons
Chang Q Sun, L. K. Pan, C. M. Li +1
It has been puzzling that the Raman optical modes shift to lower frequency (or termed as optical mode softening) associated with creation of Raman acoustic modes that shift to high…