Naslov
Crystal structure and magnetic properties of Co2TeO3Cl2 and Co2TeO3Br2

Autori
Becker, Richard ; Berger, Helmuth ; Johnsson, Mats ; Prester, Mladen ; Marohnić, Željko ; Miljak, Marko ; Herak, Mirta

Izvornik
Journal of Solid State Chemistry (0022-4596) 179 (2006); 836-842

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Oxohalogenide; Stereochemically active lone electron pair; Layered crystal structure; Magnetic order; Antiferromagnetic

Sažetak
The crystal structures of the two new synthetic compounds Co2TeO3Cl2 and Co2TeO3Br2 are described together with their magnetic properties. Co2TeO3Cl2 crystallize in the monoclinic space group P21/m with unit cell parameters a=5.0472(6)AA, b=6.6325(9)AA, c=8.3452(10)AA, beta=105.43(1)degrees, Z=2. Co2TeO3Br2 crystallize in the orthorhombic space group Pccn with unit cell parameters a=10.5180(7)AA, b=15.8629(9)AA, c=7.7732(5)AA, Z=8. The crystal structures were solved from single crystal data, R=0.0328 and 0.0412, respectively. Both compounds are layered with only weak interactions in between the layers. The compound Co2TeO3Cl2 has [CoO4Cl2] and [CoO3Cl3] octahedra while Co2TeO3Br2 has [CoO2Br2] tetrahedra and [CoO4Br2] octahedra. The Te(IV) atoms are tetrahedrally [TeO3E] coordinated in both compounds taking the 5s2 lone electron pair E into account. The magnetic properties of the compounds are characterized predominantly by long-range antiferromagnetic ordering below 30 K.

Izvorni jezik
Engleski

Znanstvena područja
Fizika, Kemija

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