The total structure factors of the molten trivalent metal chlorides MCI3, where M denotes Tb, Y. Ho or Er, were measured by using neutron diffraction. All four salts melt with a small volume change of ≤5% from structures comprising MCI6 3- octahedra to form liquids which show intermediate-range ionic ordering as manifest by a first sharp diffraction peak at ≈ 1 Å-1 that moves to smaller scattering vector values with decreasing cation size. In the liquid state, the M-C1 distances are comparable with the sum of the ionic radii and the results are consistent with the existence of distorted MCI6 3- octahedral units The implications of the results for a polarizable ion interaction model used in recent molecular dynamics calculations are briefly discussed.
|Number of pages||10|
|Journal||Journal of Physics Condensed Matter|
|Publication status||Published - 29 Nov 1999|
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics