Temperature dependence of short-range structural property in lithium-lead fluoride

In this work, X-ray Absorption Fine Structure (XAFS) measurements of PbF2 and LiF-PbF2 (PbF2: 60% mol) were carried out with Pb-LIII X-ray Absorption edge to investigate local structure of molten LiF-PbF2 which we have proposed as one of the candidates for fusion reactor blanket. We performed the measurements with wide temperature range from room temperature to above the melting point. We obtained structural information around Pb2+ ion depending on the temperature. The nearest Pb2+-F−distance and coordination number were estimated to be 2.36 Å and 6, respectively, for molten LiF-PbF2, while they are 2.27 Å and 4 for molten PbF2.