microstrain

Etymology

Definitions

1. 1

   A strain expressed in terms of parts per million.

2. 2

   The root mean square of the variations in the lattice parameters across the individual…

   The root mean square of the variations in the lattice parameters across the individual crystallites, usually across microscopic distances, <ϵ²>^(1/2). By definition, it cannot be negative. In contrast, macrostrain refers to the overall change in the lattice parameters caused by a composition change or temperature change or pressure change.

   • It should be noted that microstrain, which is larger at lower temperatures, is ignored in the calculation. The omission of microstrain causes the grain size to be underestimated which can be understood through Eq. 10.5.
   • Thus, a Gaussian shape for the microstrain-broadened diffraction-line profile occurs for a Gaussian microstrain distribution.

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