The High-Pressure Modification of CePtSn – Synthesis, Structure, and Magnetic Properties

Abstract

The high-pressure (HP) modification of CePtSn was prepared under multianvil high-pressure (9.2 GPa) high-temperature (1325 K) conditions from the normal-pressure (NP) modification. Both modifications were investigated by powder and single crystal X-ray data: TiNiSi type, Pnma, a = 746.89(9), b = 462.88(4), c = 801.93(7) pm, wR2 = 0.0487, 452 F2 values, 20 variable parameters for NP-CePtSn, and ZrNiAl type, P6̅2m, a = 756.919(5), c = 415.166(4) pm, wR2 = 0.0546, 252 F2 values, 14 variable parameters for HP-CePtSn. Both modifications are built up from platinumcentered trigonal prisms. Together, the platinum and tin atoms form different three-dimensional [PtSn] networks in which the cerium atoms fill channels. The crystal chemistry and chemical bonding of NP- and HP-CePtSn is discussed. Susceptibility measurements of HP-CePtSn indicate Curie-Weiss behavior above 40 K with an experimental magnetic moment of 2.55(1) μB/Ce atom, indicating trivalent cerium. No magnetic ordering could be detected down to 2 K.

YPdSn and YPd2Sn: Structure, 89Y solid state NMR and 119Sn Mössbauer spectroscopy

“…Within and between these hexagons the Pd-Sn distances range from 266 to 286 pm, close to the sum of the covalent radii [47] of 268 pm, indicating substantial Pd-Sn bonding. This is in good agreement with chemical bonding analysis on diverse isotypic compounds [48,49]. Similar to the structure of YPd 2 Sn, the shortest distances to yttrium occur for the palladium atoms (308-316 pm).…”

Structure and Properties of Dimorphic CePdZn

“…CePtSn transforms to a ZrNiAl type high-pressure modification under 9.2 GPa and 1325 K [2] and CePdSn [3] shows similar phase transformation. Dimorphism of CePdAl is driven by temperature.…”

“…The corresponding structure types ZrNiAl [27] for α-CePdZn and TiNiSi [28] for β-CePdZn have repeatedly been discussed in literature [32][33][34][35][36][37][38]. For further details we refer to these overviews and 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 the recent work on dimorphic CePtSn [2] and YbPdSn [39,40]. Herein we focus only on the peculiarities for dimorphic CePdZn.…”

Review on magnetic and related properties of RTX compounds

“…The high pressure modification of NdPtSn and CePtSn show change of crystal structure from TiNiSi type orthorhombic to ZrNiAl type hexagonal structure [130,131]. YbPtSn crystallizes in ZrNiAl type hexagonal structure [132].…”