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  Home > JCE Print > Journal of Chemical Education > Issues > 2007  > May  >
In the Laboratory
Using Variable Temperature Powder X-ray Diffraction To Determine the Thermal Expansion Coefficient of Solid MgO
Nicholas C. Corsepius, Thomas C. DeVore, Barbara A. Reisner, and Deborah L. Warnaar
Department of Chemistry, James Madison University, Harrisonburg, VA 22807
Cover
May 2007
Vol. 84 No. 5
p. 818
Abstract
A laboratory experiment using variable temperature powder X-ray diffraction to determine the thermal expansion coefficient of solid magnesium oxide (Mgo) is presented. Students determine the cell constant for Mgo as a function of temperature and use these data to calculate the molar volume, the thermal expansion coefficient, and the density of Mgo as a function of temperature. The value obtained by students for the linear expansion coefficient of Mgo agrees with the literature values. Data are provided so that students without access to a variable temperature powder diffractometer can analyze the data as an exercise.
Supplement
Instructions for the students, powder patterns, and data files at the temperatures explored in this experiment are available.
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Citation
Corsepius, Nicholas C.; DeVore, Thomas C.; Reisner, Barbara A.; Warnaar, Deborah L. J. Chem. Educ. 2007, 84, 818.
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Keywords
Hands-On Learning / Manipulatives; Laboratory Instruction; Materials Science; Physical Chemistry; Solid State Chemistry; Solids; Thermal Analysis; Upper-Division Undergraduate; X-ray Crystallography
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History
Created:
Last Updated:
3/22/2007
3/27/2007
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Experiments, laboratory exercises, lecture demonstrations, and other descriptions of the use of chemicals, apparatus, instruments, computers, and computer interfaces are presented in the Journal of Chemical Education as illustrative of new or improved ideas or concepts in chemistry instruction and are directed at qualified teachers. Although every effort is made to assure and encourage safe practices and safe use of chemicals, the Journal of Chemical Education cannot assume responsibility for uses made of its published materials. Many chemicals are hazardous. Precautions for the safe use of hazardous chemicals and directions for their proper disposal are described in the Material Safety Data Sheets and on the labels. We strongly urge all those planning to use materials from our pages to make choices and to develop procedures for laboratory and classroom safety in accordance with local needs and situations.
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