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Synthesis, structure and physical characterization of the structural transitions in CePd3Sn and LaPd3Sn polymorphs

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Strydom,  André M.
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Tursina, A. I., Nesterenko, S. N., Chernyshev, V. V., Sulyanov, S. N., Dorovatovskii, P. V., Britz, D., et al. (2016). Synthesis, structure and physical characterization of the structural transitions in CePd3Sn and LaPd3Sn polymorphs. Journal of Alloys and Compounds, 688, 1162-1171. doi:10.1016/j.jallcom.2016.07.069.


Cite as: http://hdl.handle.net/11858/00-001M-0000-002B-25C1-0
Abstract
Abstract Ternary stannides CePd3Sn and LaPd3Sn were synthesized by arc melting the elements. Their crystal structures determined at room temperature revealed a new structure type: sp. gr. Cmcm, Z = 4, a = 4.5160(18) Å, b = 15.878(8) Å, c = 5.396(3) Å for CePd3Sn and a = 4.5187(10) Å, b = 15.961(5) Å, c = 5.451(2) Å for LaPd3Sn. The new type of structure can be presented as built of two types of slabs stacked along the b-axis – CePdSn slab of PbFCl-type and palladium corrugated slab. CePd3Sn and LaPd3Sn undergo reversible crystal structure phase transition at 141 K and 260 K, respectively. The temperature hysteretic behavior through the transition is tracked with electrical resistivity and magnetic susceptibility. Single-crystal X-ray diffraction data at 120 K showed that the low-temperature (LT) polymorph of CePd3Sn crystallizes in the monoclinic structure type, with C2/m space group, Z = 16 and lattice parameters a = 10.8314(7) Å, b = 9.0474(5) Å, c = 15.8725(12) Å, β = 91.325(6)°. LT−CePd3Sn is found to order at low temperature into a putative antiferromagnetic spin structure below 1 K.