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Using Variable Temperature Powder X-ray Diffraction To Determine the Thermal Expansion Coefficient of Solid MgO

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Nicholas C. Corsepius , Thomas C. DeVore , Barbara A. Reisner and Deborah L. Warnaar

Department of Chemistry, James Madison University, Harrisonburg, VA 22807

J. Chem. Educ., 2007, 84 (5), p 818

DOI: 10.1021/ed084p818

Publication Date (Web): May 1, 2007

Section:

History, Education, and Documentation

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.

Keywords (Audience):

Upper-Division Undergraduate

Keywords (Domain):

Laboratory Instruction

Keywords (Pedagogy):

Hands-On Learning / Manipulatives

Keywords (Subject):

Materials Science

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