Chapter 12 Flashcards
Crystal lattice
Scaffolding for the crystal structure.
Latrice vectors
A and b (l and w)
Lattice points
Where the atoms reside in the structure
Beginning from any lattice point it is possible to move to any other lattice point by adding together multiples of the two lattice vectors
Z
Oblique lattice
A does not equal b
Y= 120
Square lattice
Y= 90
A=B
Rectangular lattice
Y=90
A does not equal b
Hexagonal lattice
Y=120
A=B
Rhombic lattice
A=B
Y= anything except 120/90
Rhombic lattice is commonly referred to as ______ ___________ _______
Centered rectangular lattice
A three dimensional lattice is defined by _ lattice vectors
3
Three dimensional lattices
Cubic
A=B=C
Y1=Y2=Y3=90
Three dimensional lattices
Tetragonal
A=b does not equal C
Y1=y2=y3=90
Three dimensional lattices
Orthorhombic
A DOESnt = b doesn’t = c
Y1=y2=y3=90
Rhombohedral
A=b=c
Y1=Y2=Y3 doesn’t equal 90
Three dimensional lattices
Hexagonal
A=b doesn’t equal c
Y1=y2= 90, y3 = 120
Three dimensional lattices
Monoclinic
A DOESnt equal b doesn’t equal c
Y1=y2= 90, y3 doesn’t equal 90
Three dimensional lattices
Triclinic
A DOESnt equal b doesn’t equal c
Y1 doesn’t equal y2 doesn’t equal y3
A body centered cubic lattice has _ lattice point in the middle
1
A face centered cubic lattice has _ lattice point at the enter of each of the _ faces
1
6
Group of atoms in a lattice point is called a _____
Motif
Metallic bonding occurs because electrons ______
Delocalize
In a primitive cubic metal, atoms in lattice equal
1
1/8 at each corner, 8 corners * 8 = 1 atom
Body centered cubic metal has
2 atoms per cell
1/8 * 8 corners= 1 \+ 1 atom in middle = 1 = 2
