5 years ago

Thermal Expansion Behavior in TcO2. Toward Breaking the Tc–Tc Bond

Thermal Expansion Behavior in TcO2. Toward Breaking the Tc–Tc Bond
Justin A. Kimpton, Maxim Avdeev, Zhaoming Zhang, Kenneth R Czerwinski, Emily Reynolds, Frederic Poineau, Brendan J. Kennedy, Gordon J. Thorogood
TcO2 has a monoclinic structure in space group P21/c between 25 and 1000 °C, as established using a combination of synchrotron X-ray and neutron powder diffraction methods, and is found to remain monoclinic in the same space group. Thermal expansion of the lattice is highly anisotropic, with negative thermal expansion of the b axis observed above 700 °C. This appears to be a consequence of weakening of the Tc−Tc bonds that form along the a axis.

Publisher URL: http://dx.doi.org/10.1021/acs.inorgchem.7b01235

DOI: 10.1021/acs.inorgchem.7b01235

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