The investigation of selected alloys in the Al-rich part of ten RE-Ni-Al systems (RE = rare earth metal) has proved the existence of eight new ternary compounds: five with stoichiometry "R4Ni6Al 23" (mC66-Y4Ni6Al23-type, for RE = Pr, Nd, Tb, Dy, Ho) and three with stoichiometry "R3Ni 5Al19" (oC108-Gd3Ni5Al 19-type, for RE = Sm, Dy and Er). In addition, the existence of R4Ni6Al23 (RE = Ce and Gd) and of Gd 3Ni5Al19 has been confirmed. Lattice parameters have been determined and compared with those previously reported in literature. The samples have been synthesized from pure elements by induction melting, annealed at 800°C and then water quenched. Micrographic characterization was carried out using a light optical microscope (LOM) and a scanning electron microscope (SEM). The structural characterization was performed by X-ray powder diffraction.
SYNTHESIS AND STRUCTURAL CHARACTERIZATION OF TERNARY COMPOUNDS BELONGING TO THE SERIES RE2+mNi4+mAl15+4m (R = RARE EARTH METAL)
DELSANTE, SIMONA;BORZONE, GABRIELLA
2009-01-01
Abstract
The investigation of selected alloys in the Al-rich part of ten RE-Ni-Al systems (RE = rare earth metal) has proved the existence of eight new ternary compounds: five with stoichiometry "R4Ni6Al 23" (mC66-Y4Ni6Al23-type, for RE = Pr, Nd, Tb, Dy, Ho) and three with stoichiometry "R3Ni 5Al19" (oC108-Gd3Ni5Al 19-type, for RE = Sm, Dy and Er). In addition, the existence of R4Ni6Al23 (RE = Ce and Gd) and of Gd 3Ni5Al19 has been confirmed. Lattice parameters have been determined and compared with those previously reported in literature. The samples have been synthesized from pure elements by induction melting, annealed at 800°C and then water quenched. Micrographic characterization was carried out using a light optical microscope (LOM) and a scanning electron microscope (SEM). The structural characterization was performed by X-ray powder diffraction.
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