Abstract
A new chromium tellurite oxochloride, Cr3Te5O13Cl3, has been prepared by solid-state reaction and the crystal structure was determined by single crystal X-ray diffraction. The compound crystallizes in the non-centrosymmetric space group P2(1)2(1)2(1) with the unit cell a = 4.90180(10) Å, b = 17.3394(2) Å, c = 17.5405(2) Å, Z = 4, R1 = 0.0282. The Cr(3+) ions have octahedral [CrO6] oxygen coordination, the Te(4+) ions have one sided [TeO3] and [TeO3Cl] coordinations. The [CrO6] octahedra are edge sharing and form chains extending along [100]. These are connected by corner sharing [TeO3] and [TeO3Cl] groups to form layers parallel to (110). The layers are connected by weak interactions in between Te(4+) in the layers and Cl(-) ions located in between. The compound undergoes antiferromagnetic ordering at ~34 K with a Weiss constant of -230 K. Isothermal magnetization measurements reveal a critical field of about 0.25 T above which the magnetization versus field changes from linear to a Brillouin-like saturation behaviour. The frustration ratio amounts to ~6.8 indicative of sizable competing antiferromagnetic spin-exchange interaction. The dielectric constant ε (6 kHz) amounts to ~7.9 and decreases by about 1% on cooling from 50 K to liquid helium temperatures.
Highlights
Oxohalide compounds comprising p-block lone-pair elements such as Se4+, Te4+, or Sb3+ often exhibit unusual structural and physical properties because both the stereochemically active lone-pair and the halide ion contribute to open up the crystal structures by terminating structural elements and by occupying space in the nonbonding regions
Crystal structure The new tellurium oxo-halide compound Cr3Te5O13Cl3 crystallizes in the non-centrosymmetric orthorhombic space group P212121
The crystal structure can be regarded as layered with the layers parallel to (110) and only weak Te–Cl interactions connect the layers, see Fig. 1
Summary
Oxohalide compounds comprising p-block lone-pair elements such as Se4+, Te4+, or Sb3+ often exhibit unusual structural and physical properties because both the stereochemically active lone-pair and the halide ion contribute to open up the crystal structures by terminating structural elements and by occupying space in the nonbonding regions. Crystal structure and magnetic properties of Cr3Te5O13Cl3†
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