ME 381R Fall 2003 MicroNano Scale ThermalFluid Science and Technology Lecture 3: Microstructure of Solids. Dr. Li Shi Department of Mechanical Engineering The University of Texas at Austin Austin, TX 78712 www.me.utexas.edu/~lishi [email protected] Outline. Kinetic Theory
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MicroNano Scale ThermalFluid Science and Technology
Lecture 3:
Microstructure of Solids
Dr. Li Shi
Department of Mechanical Engineering
The University of Texas at Austin
Austin, TX 78712
www.me.utexas.edu/~lishi
Thermal
Conductivity
Hot
Hot
Cold
p

Cold
a3
Translation Vectors
a2
a1, a2 ,a3
Atom
a1
Cubic:
Li, Na, Al, K, Cr, Fe, Ir, Pt, Au etc.
Hexagonal Closed Pack (HCP):
Mg, Co, Zn, Y, Zr, etc.
Diamond:
C, Si, Ge, Sn (only four)
Add one atom at the center of each face
Add one atom at the center of the cubic
2. BodyCentered Cubic (BCC)
3. FaceCentered Cubic (FCC)
Three Cubic Lattices1. Simple Cubic (SC)
a1=a2 =a3
a1 a2 a3
Conventional Cell= Primitive Cell
a3
a2
a1
Conventional Cell Primitive Cell
0.53a
109o28’
C, Si, Ge, aSn
Index System for Crystal Planes (Miller Indices)
1) Find the intercepts on the axes in terms of the lattice constants a1, a2, a3. The axes may be those of a primitive or nonprimitive unit cell.
2) Take the reciprocals of these numbers and then reduce to three integers having the same ratio, usually the smallest three integers. The reulst enclosed in parethesis (hkl), is called the index of the plane.
TEM images of nanobelts by
Prof. Z. L. Wang
Ar
Ar
+ Ar 
+ Ar 
Dipoledipole interaction
Cl
Cl
Na+
Cl
Na+
Na+
Cl
Cl
Na+
F
F
H+
HF2 molecule
Positive ions in a sea of electrons
Na+
Na+
Electron sea
Na+
Na+
Na+
H
H
H
H
Covalence bond
C
C
C
C
C
1D Array of Spring Mass System