Interaction of Lanthanum with Boron and Carbon: Phase Diagram and Structural Chemistry
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چکیده
8 The isothermal section of the La–B–C phase diagram at 1270 K has been investigated by 9 means of X-ray, neutron powder diffraction, microstructure and EPMA analyses. Eight ternary 10 compounds were found, and for six of them the crystal structures have been established. The 11 phase with the structure type of La5B2C6 has a broad homogeneity range described by the 12 formula La5(BC)x (5.6x8.8). The lanthanum sesquicarbide La2C3 exhibits an extended solid 13 solution in the ternary domain La2C3-xBx (x=0.4). The boron substitution of carbon leads to the 14 decrease of the superconducting temperature from 13.4 K for La2C3 to 10.0 K for La2C2.8B0.2 and 15 from 5.6K for La2C2.7 to 4.1K for La2C2.6B0.4. The compositions of two new compounds, 16 ~La4B3C12 and ~La4B5C18 were found via WDX analysis. 17 18
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