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Pregled bibliografske jedinice broj: 330555

Crystal structure and magnetic properties of two new cobalt selenite halides: Co5(SeO3)4X2 (X=Cl, Br)


Becker, Richard; Prester, Mladen; Berger, Helmuth; Lin, Ping Hui; Johnsson, Mats; Drobac, Djuro; Živković, Ivica;
Crystal structure and magnetic properties of two new cobalt selenite halides: Co5(SeO3)4X2 (X=Cl, Br) // Journal of Solid State Chemistry, 180 (2007), 3; 1051-1059 doi:10.1016/j.jssc.2006.12.035 (međunarodna recenzija, članak, znanstveni)


Naslov
Crystal structure and magnetic properties of two new cobalt selenite halides: Co5(SeO3)4X2 (X=Cl, Br)

Autori
Becker, Richard ; Prester, Mladen ; Berger, Helmuth ; Lin, Ping Hui ; Johnsson, Mats ; Drobac, Djuro ; Živković, Ivica ;

Izvornik
Journal of Solid State Chemistry (0022-4596) 180 (2007), 3; 1051-1059

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

Ključne riječi
Oxo-halide; Lone-pair elements; Crystal structure determination; Magnetic susceptibility; Zero-field splitting; Single-ion anisotropy

Sažetak
Two new isostructural cobalt selenite halides Co5(SeO3)4Cl2 and Co5(SeO3)4Br2 have been synthesized. They crystallize in the triclinic system space group P-1 with the following lattice parameters for Co5(SeO3)4Cl2: a=6.4935(8)A , b=7.7288(8)A , c=7.7443(10)A, alpha=66.051(11)1, beta=73.610(11)1, gama=81.268(9)1, and Z=1. The crystal structures were solved from single-crystal X-ray data, R1=3.73 and 4.03 for Co5(SeO3)4Cl2 and Co5(SeO3)4Br2, respectively. The new compounds are isostructural to Ni5(SeO3)4Br2. Magnetic susceptibility measurements on oriented single-crystalline samples show anisotropic response in a broad temperature range. The anisotropic susceptibility is quantitatively interpreted within the zero-field splitting schemes for Co2+ and Ni2+ ions. Sharp low temperature susceptibility features, at TN=18 and 20K for Co5(SeO3)4Cl2 and Co5(SeO3)4Br2, respectively, are ascribed to antiferromagnetic ordering in a minority magnetic subsystem. In isostructural Ni5(SeO3)4Br2 magnetically ordered subsystem represents a majority fraction (TN= 46 K). Nevertheless, anisotropic susceptibility of Ni5(SeO3)4Br2 is dominated at low temperatures by a minority fraction, subject to single-ion anisotropy effects and increasing population of Sz=0 (singlet) ground state of octahedrally coordinated Ni2+.

Izvorni jezik
Engleski

Znanstvena područja
Fizika



POVEZANOST RADA


Projekt / tema
035-0352843-2845 - Kvantni magneti: Osnovna stanja u kompeticiji (Mladen Prester, )

Ustanove
Institut za fiziku, Zagreb

Časopis indeksira:


  • Current Contents Connect (CCC)
  • Web of Science Core Collection (WoSCC)
    • Science Citation Index Expanded (SCI-EXP)
    • SCI-EXP, SSCI i/ili A&HCI
  • Scopus


Uključenost u ostale bibliografske baze podataka:


  • SCI, SCI exp.


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