Physics and Chemistry of Minerals

, Volume 32, Issue 3, pp 155–164 | Cite as

The distribution of Cu(II) and the magnetic properties of the synthetic analogue of tetrahedrite: Cu12Sb4S13

  • F. Di BenedettoEmail author
  • G. P. Bernardini
  • C. Cipriani
  • C. Emiliani
  • D. Gatteschi
  • M. Romanelli
Original papers


A wide investigation of the synthetic analogue of tetrahedrite, Cu12Sb4S13, has been performed by a combination of several techniques, magnetisation and differential scanning calorimetric measurements, cw, and pulsed EPR spectroscopy, to obtain complementary information about the presence and the distribution of Cu(II). The high temperature susceptibility of the sample accounts for two Cu(II) per formula unit, in agreement with the charge balance. However, strong antiferromagnetic interactions, observed even at room temperature, are associated with a transition at 83(3) K. At lower temperatures a residual susceptibility is observed. At 4.2 K ESEEM experiments enabled observation of the chemical environment of the residual paramagnetic species. Cu(II) was found randomly distributed in the M(1) site. The statistical presence of nearest neighbouring Cu(II) ions justify the observed antiferromagnetic interactions and transition. Nevertheless, isolated paramagnetic ions have been determined below the Néel temperature: they are mainly located near the surface of the grains. A colour centre, previously observed in natural samples, has been also identified.


EPR SQUID ESE Cu(II) distribution Antiferromagnetic transition 



The authors are indebted to M. Brustolon and A. Zoleo of the University of Padova for the ESE measurements, to F. Olmi of the IGG/CNR, for the microprobe analyses, and to M. Affronte of the University of Modena, for the low temperature DSC measurements. An anonymous referee and Professor Makovicky are also sincerely acknowledged for their punctual and stimulating revision of this manuscript. This work was partially financed by the MIUR COFIN2001 and COFIN2003 funds to C. Cipriani.


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Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  • F. Di Benedetto
    • 1
    Email author
  • G. P. Bernardini
    • 2
  • C. Cipriani
    • 1
  • C. Emiliani
    • 2
  • D. Gatteschi
    • 3
  • M. Romanelli
    • 3
  1. 1.Museo di Storia NaturaleUniversità di FirenzeFirenzeItaly
  2. 2.Dipartimento di Scienze della TerraUniversità di FirenzeFirenzeItaly
  3. 3.Dipartimento di ChimicaUniversità di Firenze(Firenze) Sesto FiorentinoItaly

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