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Interface Energy (interface + energy)

Distribution by Scientific Domains
Physics and Astronomy40%

Selected Abstracts

Nanostructured Electrodes: The Role of Surface and Interface Energy on Phase Stability of Nanosized Insertion Compounds (Adv. Mater.

ADVANCED MATERIALS, Issue 25-26 2009
26/2009)
The cover shows three structures of the Li-ion battery electrode material LixFePO4 having two coexisting phases Li-rich: dark blue, Li-poor: light blue. The vertical decreasing dimension represents the downsizing of the particle size which leads to more similar Li-ion equilibrium concentrations in both phases, as indicated by the lower contrast between the blue shaded Li-ions. This result, reported by Marnix Wagemaker and co-workers on p. 2703, helps explain the changes in equilibrium properties in nanostructured insertion compounds such as Li-ion battery electrodes and H-storage materials. [source]

The Role of Surface and Interface Energy on Phase Stability of Nanosized Insertion Compounds

ADVANCED MATERIALS, Issue 25-26 2009
Marnix Wagemaker
Thermodynamic theory reveals the impact of surface and interface energies on the equilibrium properties and solubility limits of interstitial ions in nanosized crystallites. Applied to LixFePO4 especially interface energy contributions play important roles, and their effect explains observations of the narrowing of electrochemically measured miscibility gaps in nanostructured electrodes. [source]

Nucleation, growth, and phase transformation mechanism of Ge2Sb2Te5 thin films

PHYSICA STATUS SOLIDI (A) APPLICATIONS AND MATERIALS SCIENCE, Issue 11 2009
Eun Tae Kim
Abstract The nucleation, growth, and metastable-to-stable phase transformation behavior of Ge2Sb2Te5 thin film were studied by means of transmission electron microscopy. The results confirm that nucleation begins at the surface of the film and proceeds by growth of grains through the thickness of film. Also, the result provides further grounds to the suggestion that some of the Ge2Sb2Te5 grains grow with an elongated grain shape to reduce interface energy between crystalline and amorphous phases at the initial stage of crystallization. We find edge dislocations in the metastable-to-stable phase transition region. We think these edge dislocations can explain the metastable-to-stable phase transformation mechanism as a result of vacancy diffusion. [source]

Thermal precipitation of self-organized PbTe quantum dots in CdTe host matrix

PHYSICA STATUS SOLIDI (C) - CURRENT TOPICS IN SOLID STATE PHYSICS, Issue 9 2008
K. Koike
Abstract This paper describes a selective growth of PbTe/CdTe quantum wells (QWs) and quantum dots (QDs) in CdTe host matrix by molecular beam epitaxy. These two tellurides possess almost identical lattice constants, but differ fundamentally in their lattice structure. Owing to a strong phase separation by the lattice-type mismatch, insertion of a PbTe thin layer in CdTe matrix at higher temperatures than 280 °C was resulted in a self-organized growth of coherent and three-dimensionally isotropic QDs. The same growth procedure at lower temperatures, on the other hand, yielded a conventional QW structure with sharp heterointerface. This QW structure, however, was found to precipitate well-ordered QD-array by a postgrowth annealing, indicating that the QD formation is induced by the minimization of interface energy between the inmiscible two tellurides. (© 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]