Comment on “Liquid-Liquid Phase Transition in Supercooled Yttria-Alumina”

A Comment on the Letter by Adrian C. Barnes et al., Phys. Rev. Lett. 103, 225702 (2009). The authors of the Letter offer a Reply.

Figure 1

Left. Upper: SAXS for AY20 ▪ and AY15 Δ from [2] scaled to SANS for AY20 ● from [1], together with LLT rotor motion (A and B). Lower: $S(Q)$ for $\mathrm{AY}x$ liquids from 2 corrected for detector scattering angle thickness, with compositional changes marked. Right: trends in $Q_2$, $Q_1$ and $S(Q_1)$ with $x$. $2\sigma$ errors for $Q_1$ and $Q_2$ from peak-fitting and for $S(Q_1)$ from [1] within symbol size. Arrows between closed and open symbols ↑↓ show shifts in $S(Q_1)$ for alternative compositions $x=15\leftrightarrow 20$. Horizontal arrows show $x=14\%\pm 1\%$ as the likely composition for the Letter [1] rather than AY20.