Abstract
The structure of liquid gallium (Ga) is a long-standing issue in the studies of metallic liquids. In this paper we investigate pure Ga melt in the temperature range of 307--1356 K by high-temperature $^{69}\mathrm{Ga}$ and $^{71}\mathrm{Ga}$ NMR. A structural crossover at around 1000 K is revealed through the analyses of NMR observables including the Knight shift and the spin-lattice relaxation time, which may result from the temperature-induced structural evolution of the covalently bonded clusters in pure Ga melt. However, structure and diffusivity anomalies around 450 and 730 K at ambient pressure, which may be induced by the liquid-liquid critical point, are not observed.
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