Lab 1: Symmetry Part 1

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Materials Science 142
Applications of Diffraction Techniques

Laboratory Exercises 1: Point Group Symmetry

Assigned: 4/05/06
Due:4/12/06, 5pm

Goal: Identify the point group and crystal system of a high symmetry object. Seven objects are to be analyzed.

List and identify the symmetry elements in each. For example, when describing the cube "mirror plane in (110)" .

Identify the point group of each object.

Identify to which crystal system each of the models must belong.

Details:

Turn in a description of the symmetry elements in each object, the point group of the object, and the appropriate crystal system. Make sure your drawings are relatively neat and legible. If you were not in lab, or would like to get additional copies of the cut-out patterns for the 3-d objects, you can download them here.

Additional Homework Problems:

Textbook Chapter 1: #2, #6, #7

Crystal Models

cube (gold)
cubo-octahedron (salmon)
pyritohedron (blue)
tetrahedron (green)
rhombohedron (purple)
bipyramidal crystal (rose)
dodecahedron - irregular (yellow)