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Mechanical behavior of ultralow-dielectric-constant mesoporous amorphous silica
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View: Figures


Image of FIG. 1.
FIG. 1.

Atomic configurations of ordered mesoporous structures with spherical pores after application of dynamic uniaxial compressive straining up to and subsequent isostrain thermal equilibration. The configurations depict an -thick slice of the supercell around a {001} plane of the simple cubic lattice of the spherical pores that passes through the pore centers. Configurations are shown at (a) constant density, , for pore diameters , 2.5, 1.67, and and (b) at constant pore diameter, , for densities , 0.82, 0.77, and 0.72.

Image of FIG. 2.
FIG. 2.

Calculated (solid squares) as (a) a function of at various densities, , and (b) a function of at various pore diameters, . The inset in (a) shows the elastically stored energy per atom as a function of strain during dynamic uniaxial compressive straining for the normal-density structure (black) and for the mesoporous structures with and pore sizes of 2.5 and (green and cyan, respectively). In this inset, the smooth curves are quadratic polynomial fits according to the relation , where is the strain at the minimum of the corresponding parabola; in every case shown except for the one with . The inset in (b) shows the density dependence of the predicted (open circles) elastic (Young) moduli for the mesoporous structures with a pore size of in a logarithmic plot of as a function of . The straight line is a fit according to the scaling relationship with .


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Mechanical behavior of ultralow-dielectric-constant mesoporous amorphous silica