Negative Thermal Expansion of Mercurous Halides
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Thermal expansions of single crystals of mercurous halides grown by the physical vapor transport method have been investigated. The unit cell lattice parameters were measured by using x-ray diffraction, whereas, the bulk thermal expansion was investigated using the dilatometer instrument as a function of temperature. It was found by both techniques that mercurous halides exhibit positive linear thermal expansion along the a-axis and negative linear thermal expansion along the c-axis. However, the volume expansion in both methods was found to be positive. The coefficient of thermal expansion along the a-axis was significantly larger than the one along the c-axis giving a net positive volume expansion.
KeywordsThermal expansion NTE (negative thermal expansion) mercurous halides XRD
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This research has been supported by the US Army Chemical Biological Defense contract no. W911SR-14-C-0065 and US Army Research Laboratory contract nos. W911QX-06-C-0074 and W911QX-06-C-0074-P0006.
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