Abstract
Transmission XAFS measurements were performed on lanthanum chloride (LaCl3) and LaCl3-Li2O mixture at various temperatures using La-K x-ray absorption edge. A distinct phase shift in the EXAFS oscillations was observed in going from the solid phase to the molten phase in LaCl3. The results of curve fitting to the predominant peak in the structure function of LaCl3 in real space, corresponding to the La3+-Cl− 1st coordination shell, reveal that both the inter-ionic distance and coordination number of chloride ions around a lanthanum ion decreased with increase in temperature to above its melting point. The short-range structure of LaCl3-Li2O (xLi2O = 5 mol%) mixture appears to be almost similar to that observed in pure LaCl3.
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