NEW:Update 2004

This year the National Educator's Workshop (NEW:Update 2004) will be held in Tempe, AZ from October 16-October 20, 2004.  This workshop gives instructors a chance to share tips, tricks and experiments used in the materials science laboratory courses being taught at universities, community colleges and technical schools and even high schools across north America. It is being organized by Jim Jacobs at Norfolk State University and is sponsored by NASA-Langley, the Air Force Office of Scientific Research, MSEL (NIST), Norfolk State University, Arizona State University, BIMat (NASA), TiiMS (NASA), the National Institute of Aerospace, and ASM Materials Education Foundation.


Using X-ray Diffraction to Measure Changes in Lattice Parameters Due to Alloying
By: Mike Meier
This paper describes an experiment in which pieces of copper and brass are simultaneously scanned using an x-ray diffractometer to collect the patterns for both materials. By scanning them simultaneously one can save a lot of time and minimize sample displacement errors which can be troublesome in diffraction measurements that require precise lattice parameter determinations. The students also calculate the changes in lattice parameters and density and the expected shift in diffraction peak positions assuming Vegard's law applies. The results were very close to the published values but deviated from the calculated value, indicating that Vegard's law does not apply in this case.

Click here to view the paper or right-click and "Save As" to download it.


Comparison of calculated and measured lattice parameters.

Back to top.

Resistivity of Metal Wire as a Function of Temperature
By: Mike Meier and Rita Kirchhofer
This paper describes an experiment in which 2 meter lengths of 24-28 gage wire are wound around a ceramic tube, heated in a tube furnace, and then cooled while the resistance and temperature are recorded. The equipment setup is pretty simple and utilizes a simple battery-powered wheatstone bridge. The results are processed to obtain the temperature dependence of the resistivity. The results compare well with the values listed in the CRC handbook of Chemistry and Physics.

Click here to view the paper or right-click and "Save As" to download it.


The simple equipment setup used in this experiment.

Back to top.