Superconductivity signs at 110 K on boride inclusion phases TiB$_k$ in the Titanium matrix

An experimental check of theoretically predicted high-temperature superconductivity in titanium borides TiB$_k$ is done. These predictions, published as a theoretical phase diagram, concerned the possibility of the existence of high-T c TiB$_k$ phases with compositions $1.43<k<2.57$. In titanium samples coated by diffuse surface boride layers of depth-variable composition TiB$_k$, there is a jump in the electrical resistance versus temperature dependence $R(T)$ at 110 K. This proves the presence of superconducting inclusion phases in the layers. Diffuse boride layers were applied to metallic titanium by exposing its surface to a B$_2$H$_6$+H$_2$ gas mixtures at 610-700 $^\circ$C followed by vacuum annealing. The composition of boride layers was studied by mass spectrometry.