Papers by Keyword: Structural Transition

Abstract: Previous researchers have proved that units constituting monodisperse bilayer foams can transform reversibly by changing foam liquid fraction. Structural transformation of bilayer ferro-foams caused by magnetic field is investigated in this paper. It is observed that bilayer ferro-foams transform from Tóth structure to honeycomb structure caused by liquid fraction change which attributes to foam imbibition under a uniform magnetic gradient field. In order to acquire critical structural transformation liquid fraction range, foam liquid fractions are calculated by image analysis. However, we also observed that, when applying a homogeneous magnetic field, bilayer ferro-foams can also perform this transformation at a constant liquid fraction. This phenomenon is related to energy absorption of foam system, which is induced by magnetic interaction of magnetic moments after applying a magnetic field. This self-organizational behavior of foam structure is believed to be based on energy minimization principle. This study opens possible applications in the field of metal foam preparation.

Abstract: The structural transitions of the rapidly cooled Ti₇₅Al₂₅ under high pressures were studied by using molecular dynamics simulations. This work gives the structural properties, including the potential energy, pair-correlation function, Honeycutt-Andersen (HA) and Voronoi indices, and temperature dependence. Our results indicated that the liquid Ti₇₅Al₂₅ was frozen into glass state at the temperature about 300 K under different pressures during the same quenching processes. With increasing of pressure, the glass transformation temperature (T_g) become high. The icosahedral and defect icosahedral clusters increase as the temperature decreases under different pressures. But the icosahedral cluster increases with the increasing pressure and defect icosahedral clusters keeps invariability at 300 K.

Abstract: The structural transitions of Ag₉₆₅ clusters during two different quenching processes (Q1:1.0×10¹⁴ K/s, Q2: 1.0×10¹² K/s) were studied using molecular dynamics simulations. This work gives the structure properties including the variations with temperature of pair-correlation function, bond-angle distribution function, bond pairs and bond orientational order parameters in both rapid quenching processes. Our results indicated that the liquid Ag965 was frozen into amorphous structure at 100 K under the quenching condition Q1. While the liquid Ag₉₆₅ transformed to hexagonal close-packed (hcp) phase at the temperature 100 K under the quenching condition Q2.These instructions give you basic guidelines for preparing papers for conference proceedings.

Abstract: We have synthesized CeRuSn single crystals and performed measurements of electrical resistivity and specific heat. At high temperatures, abrupt transitions were observed at 290 and 225 K in electrical resistivity during cooling. Both transitions are connected with a large temperature hysteresis. Low temperature properties are dominated by an antiferromagnetic transition at 2.9 K, which involves only half of cerium ions, leaving the rest of them non-magnetic. A significant magnetocrystalline anizotropy was revealed by application of external magnetic field.