Inelastic-neutron-scattering studies on glassy and liquid Ca0.4K0.6(NO3)1.4

Triple-axis inelastic-neutron-scattering measurements have been carried out on the ionic glass material Ca0.4K0.6(NO3)1.4. Our measurements of the temperature dependence of the position of the main elastic diffraction peak in the liquid give a linear coefficient of thermal expansion of (2.3±0.2)×10-4, which is markedly greater than the value of 1.2×10-4 from density measurements. This shows that the expansion is accompanied by structural …