Abstract
The structural, electronic and elastic properties of potassium hexatitanate (K2Ti6O13) whisker were investigated using first-principles calculations. The calculated cell parameters of K2Ti6O13 including lattice constants and atomic positions are in good agreement with the experimental data. The obtained formation enthalpy (−61.1535eV/atom) and cohesive energy (−137.4502eV/atom) are both negative, showing its high structural stability. Further analysis of the electronic structures shows that the potassium hexatitanate is a wide-band semiconductor. Within K2Ti6O13 crystal, the TiO bonding interactions are stronger than that of KO, while no apparent KTi bonding interactions can be observed. The structural stability of K2Ti6O13 was closely associated with the covalent bond interactions between Ti (d) and O (p) orbits. Further calculations on elastic properties show that K2Ti6O13 is a high stiffness and brittle material with small anisotropy in shear and compression.
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