Phase relationships in the La–Ni–Si system at 673 K

The phase relationships in the La–Ni–Si ternary system at 673 K were investigated by X-ray diffraction (XRD), differential thermal analysis (DTA), scanning electron microscopy (SEM) and electron probe microanalysis (EPMA). All phase relationships were studied at 673 K. At this temperature, the existence of 14 ternary compounds has been confirmed. This section consists of 35 single-phase regions, 78 two-phase regions, and 47 three-phase regions. At 673 K, the maximum solid solubility of Si in Ni, La2Ni7, LaNi5, and La2NiSi is about 9, 3, 8.33, and 5 at.%, respectively. Several ternary compounds form a homogeneity region which can be expressed as LaNi11.6–9.5Si1.4–3.5, LaNi8.8–8.4Si4.2–4.6, and LaNi7.8–6.5Si5.2–6.5. [Copyright &y& Elsevier]