Abstract
The equilibrium phase diagram of the Sm-Ni-Sn ternary system is constructed in the whole concentration range at 773 K using methods of powder X-ray diffractometry, scanning electron microscopy, and energy-dispersive X-ray spectroscopy. Interaction of samarium with nickel and tin resulted in the formation of sixteen ternary compounds. Among them, four new ternary phases were found, and their crystal structure was determined: Sm4.75Ni1.6Sn1.25 (Mo5SiB2-type), SmNi4.84Sn1.16 (CeNi5Sn-type), Sm3Ni3.75Sn6.25 (Ce3Pd4Sn6-type), and Sm4Ni2Sn5 (related to Mg5Si6-type). The formation of the Sm(Ni1-xSnx)5 solid solution in the range 0 ≤ x ≤ 0.084 based on the SmNi5 binary phase (CaCu5-type) was revealed. Structural features and bonding of the ternary intermetallics in the Sm-Ni-Sn system are discussed based on the results of crystal chemistry analysis and DFT modeling.
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