Phase transition of nano-sized amorphous tungsten to a crystalline state

In this paper, some thermal properties of nano-sized amorphous W oxide and WO2 were measured. It was shown that amorphous nanoscale metal is crystallized at the temperature 1000-1370 degree C and this generates 170 ± 25 J/g energy substantially coincident, as expected, with a heat of phase transition point. As is typical for all nanosized amorphous material, phase transition temperature considerably less than half of the melting temperature of the material and does not have a strict threshold character observed for normal phase transition in crystalline materials