SURFACE AND BULK TORTUOSITY OF POROUS CERAMICS NEAR THE PERCOLATION-THRESHOLD

被引：10

作者：

BERNARD, M

WILLIAMS, GA

机构：

来源：

PHYSICAL REVIEW LETTERS | 1991年 / 67卷 / 18期

关键词：

D O I：

10.1103/PhysRevLett.67.2585

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The surface and bulk tortuosities of sintered Al2O3 ceramic samples have been measured using third-and fourth-sound propagation in superfluid He-4 as a probe. Near the pore-space percolation threshold the index of refraction of both sound modes is found to increase rapidly as the porosity is lowered, to much higher values than previously observed. The bulk tortuosity exceeds the surface tortuosity for porosities below 30%, a reversal of the behavior observed at high porosity.

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页码：2585 / 2588

页数：4

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