Ternary Erbium Chromium Sulfides: Structural Relationships and Magnetic Properties

Abstract

Single crystals of four erbium-chromium sulfides have been grown by chemical vapor transport using iodine as the transporting agent. Single-crystal X-ray diffraction reveals that in Er(3)CrS(6) octahedral sites are occupied exclusively by Cr(3+) cations, leading to one-dimensional CrS(4)(5-) chains of edge-sharing octahedra, while in Er(2)CrS(4), Er(3+), and Cr(2+) cations occupy the available octahedral sites in an ordered manner. By contrast, in Er(6)Cr(2)S(11) and Er(4)CrS(7), Er(3+) and Cr(2+) ions are disordered over the octahedral sites. In Er(2)CrS(4), Er(6)Cr(2)S(11), and Er(4)CrS(7), the network of octahedra generates an anionic framework constructed from M(2)S(5) slabs of varying thickness, linked by one-dimensional octahedral chains. This suggests that these three phases belong to a series in which the anionic framework may be described by the general formula [M(2n+1)S(4n+3)](x-), with charge balancing provided by Er(3+) cations located in sites of high-coordination number within one-dimensional channels defined by the framework. Er(4)CrS(7), Er(6)Cr(2)S(11), and Er(2)CrS(4) may thus be considered as the n = 1, 2, and infinity members of this series. While Er(4)CrS(7) is paramagnetic, successive magnetic transitions associated with ordering of the chromium and erbium sub-lattices are observed on cooling Er(3)CrS(6) (T(C)(Cr) = 30 K; T(C)(Er) = 11 K) and Er(2)CrS(4) (T(N)(Cr) = 42 K, T(N)(Er) = 10 K) whereas Er(6)Cr(2)S(11) exhibits ordering of the chromium sub-lattice only (T(N) = 11.4 K).

The crystal structure, magnetism, and colossal magnetoresistance of Y 2 CrS 4

“…All the atoms were at the 4a sites, and the isotropic atomic displacement parameters were fixed to be 0.3 Å2 . The refined results are shown in Table 1, and are similar to the results in the previous literature, [10,11] except for the atomic coordinates. The crystal structure of Y 2 CrS 4 and the bond lengths between Cr and S calculated from the refined crystal structure of Y 2 CrS 4 are presented in the insets of Fig.…”

“…The weight pattern factor and the expected factor from the Rietveld refinement are R wp = 15.7% and R exp = 8.46%, respectively. The structures of crystal Er 2 CrS 4 [11,12] and the previous report [10] were used as the initial parameters for the Fullprof program, [13] respectively. All the atoms were at the 4a sites, and the isotropic atomic displacement parameters were fixed to be 0.3 Å2 .…”

Quaternary Tin(IV) Antimony(III) Sulfide Decorated with Lanthanum(III) Ethylenediamine Complexes: [La(en)4SbSnS5]2·0.5H2O

“…Multinary metal chalcogenides constructed by the combination of main-group (or transition-metal) ions and rare-earth metal ions are of interest in solid-state chemistry because of their fascinating architectures and promising physical properties. − The majority of them involve pure inorganic ternary or quaternary compounds such as Eu 5 Sn 3 S 12 , K 2 La 2 Sb 2 S 9 , and EuCu 2 SnS 4 . On the other hand, a variety of chalcogenide-based organic−inorganic hybrid compounds with the incorporation of organic species such as organic amines have attracted increasing attention because they may engender new useful properties.…”

Crystallographic, Electronic, and Magnetic Properties of Rock Salt Superstructure Sulfide Lu2CrS4 with Jahn–Teller Distortion

“…For divalent Cr with a high-spin 3d 4 electronic configuration, the Jahn–Teller effect often plays an important role in structural stabilization and electrical, magnetic, and optical behavior. All of the reported compounds in the chromium systems R 2 CrS 4 (R = Ho–Yb, Y) have the Er 2 CrS 4 -type structure. ,− The Er 2 CrS 4 -type structure is very similar to the Y 2 MnS 4 -type structure, but there exist two long and four short Cr–S bond lengths in the octahedral environment. Because Jahn–Teller ordering prevents cation disordering, the R and Cr atoms occupy independent crystallographic sites.…”