This
portion of the lab report/memorandum will be graded by the teaching assistants
based on the criteria shown in Table 1 below. There are a total of 100 points,
with 2 bonus points.
Table 1: Technical Grading Guidelines
|
Criteria |
Pts
|
Description |
|
1) Format |
5 |
This should be a formal lab report or technical memorandum. It should be as brief and clear as possible. Avoid using unnecessary information as well as long sentences and paragraphs. |
|
2) Modeling Limitations and Sources of Error |
5 |
What may or may not have caused errors in your measured values (eg. interplanar spacing)? This is a key component to any lab report. No matter how bad your data turns out, if you can explain why it is off, you have usually accomplished the goal. |
|
3) References to Graph/Table in text |
5 |
References to the tables and graphs in the text are important so that the reader can reference the data being spoken about. |
|
4) Captions |
4 |
Captions on graphs and Data Tables make it easier for the reader to find the data he or she needs quickly and easily. |
|
5) Units |
4 |
Correct units should be shown with all the measured and calculated values. |
|
6) Model construction |
4 |
Explain why you are using ping-pong balls to construct the crystal structures in this lab. Show measured diameters as well as the average diameter. |
|
7) Measured Interplanar Spacing Values |
10 |
Present in a table the measured (10 pts) values for interplanar spacing. |
|
8) Calculated Interplanar Spacing Values |
15 |
Present in a table the calculated values (10 pts) for interplanar spacing. Show related equations (5 pts). |
|
9) Interstitial Voids |
8 |
Tabulate the measured values for the interstitial voids in the three structures. |
|
10) Comparison of different structures |
20 |
Compare the properties, both similarities and differences, of the three structures (size of interstitial voids, packing factors, interplanar distances, volume comparison etc.) For example explain how did the packing of balls in fcc and hcp structures differ from that in bcc? Refer to Tables. |
|
11) Materials Examples |
3 |
List at least three elements in each structure. |
|
12) Close/Closest packed planes |
5 |
What is the difference between a close-packed plane and a closest-packed plane? Use specific examples from each structure to illustrate your discussion, and include info on planar density. What is the importance of close-packed planes? |
|
13) Packing |
2 |
How did packing affect the interstitial size? |
|
14) Basal plane |
2 |
What is a basal plane? Indicate the structure that has a basal plane and its indices. |
|
15) Close pack direction in FCC/BCC |
4 |
Identify the close packed directions in the FCC and BCC structures, as well the linear density for a close packed direction. What is the importance of close-packed directions? |
|
16) Stacking Sequence |
4 |
Explain what ‘stacking sequence’ means. Show which stacking sequence if any each structure shows. |
|
17) Additional points |
2 |
Bonus points for good explanations and extra visual aids. |