Structure of Crystalline Solids Flashcards
(55 cards)
It is a material in which its atoms area arranged in a repeating or periodic array
Crystalline Material
Material wherein long range order is absent
Non-Crystalline
What is another term for non-crystalline?
Amorphous
It refers to the manner in which atoms, ions or molecules are spatially arranged
Crystal Structure
It means a three dimensional array of points coinciding with atom positions
Lattice
It is the basic structural unit or building block of the crystal structure
Unit Cell
It is the smallest entity which is repeated in three dimensions.
Unit Cell
Most unit cells are called ____
Parallelepipeds
Structures that tend to have lower energies
Dense, ordered packing
Has atoms that are periodically packed
Crystalline Materials
Has atoms that have no periodic packing
Non Crystalline Materials
The atomic bonding in this group of materials is nondirectional in nature
Metallic Crystal Structures
It refers to the nearest neighbor or touching atoms
Coordination Number
It is the volume of atoms per unit cell/volume of unit cell
Atomic Packing Factor
It is the sum of the sphere volumes of all atoms within a unit cell divided by the unit cell volume
Atomic Packing Factor
It is rare due to its low packing density
Simple Cubic Structure
A unit cell that consists of atoms situated only at the corners of the cube
Simple Cubic Structure
Coordination Number of Simple Cubic
6
APF of Simple Cubic
0.52
How many atoms are there in a unit cell of simple cubic?
1 atom
The only element with a simple cubic structure
Polonium
It has a cubic unit cell with atoms located at all eight corners and a single atom at the cube center
Body-Centered Cubic Structure
How many atoms are there in a unit cell of body-centered cubic?
2 atoms
Coordination Number of BCC
8
