ME114 Lecture 2
September 27, 2016
Bonding
Crystal Structure
Bravais Lattices
Braggs Law
X-Ray Diffraction
Review of Lecture 1
Matter Waves
Einstein = h/p for a photon
deBroglie = h/mv for a particle
Aircraft carrier
= h/mv = h/ 113000 tons x 56 k
WELCOME TO ME 114 DISCUSSION!
Guidelines
Dont let your device distract
others
Bring textbook/calculator if you
have it
Ask questions at any time
You should take notes, similar
material will be on the exams
Slides might be posted
Format
A few example
Electronic Materials ME 114
November 08, 2016
Ohms Law
V= I R
I = V/R
R= V/I
Ohms Law -Power
P= I2R
P=IV
P= V2/R
Electrical Conduction
Resistivity, :
- a material property that is independent of sample size and
geometry
RA
cross-sectional area
of cur
Lecture 13
Magnetic Properties
Schedule
November 15: Magnetic Materials
November 17: Optical Materials
November 22: Thin Film Growth and Processing (last quiz)
November 24: Thanksgiving
November 29: Materials Characterization
December 1: Exam 4 (Final)
2
Lecture 16
Characterization
Schedule
November 29: Materials Characterization
December 1: Exam 4 (Final)
2
X-Ray Diffraction (XRD)
2d sin = n - Bragg Condition
Identify crystal structure, and lattice constants
Elastic process
Reflection High Energy Elec
ME114 Lecture 8
October 20th 2016
Read Callister Chapter 6 and 7
1
Exam 1
Tentative Schedule
October 17: Mechanical Properties 1
October 20: Mechanical Properties 2
October 25: Exam 2 Defects, and Diffusion
October 27:
November 1:
November 3:
November 8:
Scott Leach
sleac001
11/29/16
Last Homework Set (I hope)
1)
a)
The charge carriers are electrons since the graph has a positive slope
b)
slope of graph is
2500
6
= 416.7, then 416.7 =
Therefore the charge carrier density is 14.98 10
1
ne
19
where e = 1.60
1.
a.
b.
c.
Above is a graph from a quantum hall measurement Rxy the blue trace is the Hall resistance.
What are the charge carriers (electrons or holes)?
What is the carrier density?
Assuming the sheet resistance is 50 Ohms/square, what is the mobility.
Note the hexagonal system has 4 axes, 3 of which are
coplanar and not linearly independent. Planes are (hkil)
where i=-(h+k). Directions are [uvtw] where t=-(u+v)
WEEK 3 DISCUSSION
Miller Indices for <[Directions]>
1. Choose a convenient origin, ideally
ME114 Lecture 5
October 6, 2016
Review
Diffusion
Diffusion
Diffusion
Wolfram CDF
Links on i-Learn
Wolfram CDF
Links on i-Learn
Review of Lecture 4
Special Case Hexagonal Close Packed System HCP
In the HCP system it is convenient
to use 4 miller indic
ME114 Lecture 4
October 4, 2016
Miller Indices
Point Defects
Dislocations
Planar Defects
Review of Lecture 3
Basis- Example Sodium Chloride
The space lattice is a face centered cubic FCC
The basis is two atoms 1 Na and 1 Cl
The position of the atom
ME114 Lecture 7
October 18th 2016
Read Callister Chapter 6 and 7
1
Tentative Schedule
October 17: Mechanical Properties 1
October 20: Mechanical Properties 2
October 25: Exam 2 Defects, and Diffusion
October 27:
November 1:
November 3:
November 8:
Novembe
ME114 Lecture 3
September 29, 2016
Bravais Lattices
Miller Indices
Review of Lecture 2
Electronegativity
Describes how strongly an atom
attracts electrons.
Electronegativity is affected by
both atomic number and the
distance at which electrons reside
ME 114 Introduction to Materials Science and Engineering
HW 3
Due 11-Oct-16
1. Calculate the atomic radius in nm for the following (a) BCC metal with lattice parameter a0 = 0.383
nm. (b) HCP metal with c lattice parameter = 0.754nm
(a)
=
(b)
3
4
for BCC,
Home Work 3
Due October 11.
1.) Calculate the atomic radius in nm for the following (a) BCC metal
with lattice parameter a0 = 0.383 nm. (b) HCP metal with c lattice
parameter = 0.754nm
2.) Calculate the lattice parameter using atomic radii for (a) Bariu
Home work due 10-25-2016
1. Name three point defects.
2. What type of defect would you expect to move faster in a crystal, interstitial or vacancy?
3. What type of defect is an edge dislocation? eg linear planar or point.
4. What is the Burgers vector ori
HW Mechanical Properties
Due November 10th
1. Calculate the maximum force that a 0.2-in. diameter rod of Al2O3,
having a yield strength of 35,000 psi, can withstand with no plastic
deformation. Express your answer in lbs and N.
2. A material with a diamet
Homework 2-1
Read Ch3
Problems
1 Calculate ionic character of the following compounds
NbSe3 , GaAs, CsCl
Homework 2-2
2 Find Wigner-Seitz cell of
Homework 2-3
3 Circle the basis and label the lattice primitive vectors
Scott Leach
ME 114
10/25/16
Homework Set 4
1. Name Three point defects
a. Vacancy
b. Frenkel-pair
c. interstitial
2. What type of defect would you expect to move faster in a crystal, interstitial or vacancy?
a. Interstitial since it doesnt have to wait fo
