Principles of Inorganic Materials Design
Chapter One
The Mesoscale
The prefix meso- comes from the Greek mesos, meaning "intermediate" or "in the
middle." Materials scientists and engineers describe the structure of a substance at
four different length scales: macroscopic > mesocopic > microscopic > molecular/
nano level. Sometimes the labels for the two intermediate levels are interchanged.
To avoid confusion in this textbook, we group these two levels into one "meso"
length scale between the nano- and macroscopic levels.
Before the advent of X-ray diffractometry, mineralogists could only visually
examine crystals. An entire classification scheme was developed and still in use
today for describing a single crystal's external morphology, or macroscopic
appearance. One or more of 47 possible forms are usually apparent in the morphology.
A form is a collection of symmetry-equi ... read full excerpt from Principles of Inorganic Materials Design ebook