ИСТИНА

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. 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)˚.