The neodymium-gallium system
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Add time:08/04/2019 Source:sciencedirect.com
The binary phase diagram of the neodymium-gallium system has been investigated by differential thermal analysis (DTA), X-ray diffraction and metallography. Four intermetallic compounds were identified: Nd3Ga, Nd5Ga3, NdGa and NdGa2. The DTA results indicate the possible existence of two intermetallic compounds, unidentified as yet, on the gallium-rich side. NdGa2 melts congruentiy at a temperature of 1488 °C and the other compounds form peritectically. Two eutectic reactions were found in this system: one at 651 °C on the neodymium-rich side and a second at 30 °C on the gallium-rich side. The allotropic transition of neodymium is lowered from 867 °C to 813 °C when more than 1 at.% gallium is added. The structure of Nd3Ga was found to be of the cubic Cu3Au type and the lattice parameter was found to be α = 4.676 ± 0.008 Å.
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