Thermal Expansion Behavior in TcO2. Toward Breaking the Tc-Tc Bond.
Emily ReynoldsZhaoming ZhangMaxim AvdeevGordon J ThorogoodFrederic PoineauKenneth R CzerwinskiJustin A KimptonBrendan James KennedyPublished in: Inorganic chemistry (2017)
The structure of TcO2 between 25 and 1000 °C has been determined in situ using X-ray powder diffraction methods and is found to remain monoclinic in space group P21/c. Thermal expansion in TcO2 is highly anisotropic, with negative thermal expansion of the b axis observed above 700 °C. This is the result of an anomalous expansion along the a axis that is a consequence of weakening of the Tc-Tc bonds.