First-order phase transition in a new CaCu5-related antimonide, CePt5Sb

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American Chemical Society
A new CaCu(5) related antimonide, CePt(5)Sb, has been identified. This ternary compound undergoes a structural phase transition at about 80 K according to room- and low-temperature X-ray and neutron diffraction, and measurements of electrical resistivity, specific heat and magnetism. The room temperature phase forms a new rhombohedral structure, space group R (3) over bar, a = 0.53535(2) nm, c = 3.10814(12) nm and consists of alternating blocks of CaCu(5)- and MnCu(2)Al-type fragments that extend along the c-axis. The low-temperature phase is monoclinic, space group Cm, a = 0.91821(5) nm, b = 0.53696(1) nm, c = 1.08064(6) nm, beta = 107.40(1)degrees. The unit cells of both structures (orthohexagonal and monoclinic) are geometrically related via the transformation matrix a' = -b', b' = -a, c'=1/3b - 1/3c. Bulk properties elucidate the phase transition being of first-order and evidence Kondo interactions at low temperatures. © 2011, American Chemical Society
X-ray diffraction, Neutron diffraction, Magnetism, Rare earths, Antimonides, Electric conductivity
Salamakha, L., Bauer, E., Michor, H., Hilscher, G., Muller, H., Svagera, R., Sologub, O., Rogl, P., Hester, J., Roisnel, T., Giester, G., & Mudryi, S. (2011). First-order phase transition in a new CaCu(5)-related antimonide, CePt(5)Sb. Chemistry of Materials, 23(17), 4016-4024. doi:10.1021/cm201584f