Chapter 2 Flashcards
(8 cards)
Solids have what kind of structures?
Crystalline!
Most metals are crystaline! Most glass and plastic is amorphous!
Solids are formed when…
Definite bonsd exist between component atoms of molecules.
Solids that do not have repetitive 3D structure (aka, crystalline) are considered…
Amorphous!
Dictionary definition: without form.
What are the repeating structures in crystalline solids called?
What do they form when joined into a larger array?
Unit cells
A lattice.
What are the 4 types of common crystal (unit) cells?
Simple cube, BCC, FCC, HCP
What is the line called that forms where grains fall into place as the liquid cools to a solid?
A grain boundary
What does the type of crystal a solid has affect?
It’s properties, grain size, and bond strengths.
How do material engineers know what type of structure a solid has?
What patterns do amorphous materials diffract?
X-ray diffraction techniques blast at solid and the rays diffract differently depending on the structure.
Amorphous materials do not have an ordered enough structure; short tho
