Enhanced superconductivity of the Ti - Zr alloys in the high-pressure BCC phase

A high-pressure study of the crystal structure and superconductivity of Ti - Zr alloys demonstrates an increase of the $\omega - \beta$ transition pressure from about $30$ to $43$–$57$ GPa when the titanium content in the alloys increases from $0$ to $50$ at.$\%$. The isobaric values of the BCC $\beta$-phase superconducting temperature (at $46$ GPa) increase from $5.7$ to more than $15$ K between $0$ and $50$ at.$\%$ Ti, the latter value being the absolute maximum for BCC $d$- metal alloys. These data correlate with the earlier assumption of an $s{-}d$ electron transfer in Zr under pressure.