Structural properties of potassium-ammonia liquids in graphite

Abstract

The in-plane x-ray diffuse scattering $I_{\perp }$(q) from the metal-ammonia K-${\mathrm{NH}}_3$ liquid layers in the ternary graphite intercalation compound K(${\mathrm{NH}}_3$ ${)}_{4.33}$ ${\mathrm{C}}_{24}$ has been measured at room temperature and yields a liquid structure factor which is dominated by a relatively sharp peak at q=$q_{\perp }$=0.88 A${̊}^{\mathrm{-}1}$ and a broad, more intense peak at $q_{\perp }$=2.00 A${̊}^{\mathrm{-}1}$. We have also measured a $c^{\mathrm{*}}$ scan I($q_{\perp }$=0.88 &) which is symmetric and monotonically decreasing about the position $q_{\perp }$=0.88 &=0.