An extensive characterisation of the magnetic properties of synthetic powders of kuramite, with formal composition Cu3SnS4, was performed. Powders were investigated through superconducting quantum interference device (SQUID) magnetometry, electron paramagnetic resonance (EPR) spectroscopy, X-ray powder diffraction (XRPD), scanning and transmission electron microscopies (SEM and TEM) and microanalysis. SEM and TEM reveal the presence of nanodimensioned particles. XRPD clearly shows that Cu3SnS4 crystallised in a cubic sphalerite-type structural model, in spite of the stannite-type tetragonal structure described for the natural phase. This difference arises from a full random distribution of cations. Synthetic kuramite nanopowders exhibit a marked paramagnetism, originated by the presence of Cu(II), definitely assessed by EPR measurements. Moreover, the overall magnetic behaviour of the sample cannot be simply ascribed to diluted paramagnetism, and this suggests the presence of strong superexchange interactions among Cu(II) ions even at room temperature. The main consequences of these results are the definitive assessment of the chemical formula Cu(I)2Cu(II)SnS4 and of a random distribution of Cu(II), Cu(I) and Sn(IV) ions within the available tetrahedral sites.

Magnetic properties and cation ordering of nanopowdersof the synthetic analogue of kuramite, Cu3SnS4 / Francesco Di Benedetto; Daniele Borrini ; Andrea Caneschi ; Gabriele Fornaciai ; Massimo Innocenti ; Alessandro Lavacchi ; Carlo Andrea Massa ; Giordano Montegrossi ; Werner Oberhauser ; Luca A. Pardi ; Maurizio Romanelli. - In: PHYSICS AND CHEMISTRY OF MINERALS. - ISSN 0342-1791. - STAMPA. - 38:(2011), pp. 483-490. [10.1007/s00269-011-0421-8]

Magnetic properties and cation ordering of nanopowdersof the synthetic analogue of kuramite, Cu3SnS4

DI BENEDETTO, FRANCESCO;BORRINI, DANIELE;CANESCHI, ANDREA;INNOCENTI, MASSIMO;LAVACCHI, ALESSANDRO;ROMANELLI, MAURIZIO
2011

Abstract

An extensive characterisation of the magnetic properties of synthetic powders of kuramite, with formal composition Cu3SnS4, was performed. Powders were investigated through superconducting quantum interference device (SQUID) magnetometry, electron paramagnetic resonance (EPR) spectroscopy, X-ray powder diffraction (XRPD), scanning and transmission electron microscopies (SEM and TEM) and microanalysis. SEM and TEM reveal the presence of nanodimensioned particles. XRPD clearly shows that Cu3SnS4 crystallised in a cubic sphalerite-type structural model, in spite of the stannite-type tetragonal structure described for the natural phase. This difference arises from a full random distribution of cations. Synthetic kuramite nanopowders exhibit a marked paramagnetism, originated by the presence of Cu(II), definitely assessed by EPR measurements. Moreover, the overall magnetic behaviour of the sample cannot be simply ascribed to diluted paramagnetism, and this suggests the presence of strong superexchange interactions among Cu(II) ions even at room temperature. The main consequences of these results are the definitive assessment of the chemical formula Cu(I)2Cu(II)SnS4 and of a random distribution of Cu(II), Cu(I) and Sn(IV) ions within the available tetrahedral sites.
2011
38
483
490
Francesco Di Benedetto; Daniele Borrini ; Andrea Caneschi ; Gabriele Fornaciai ; Massimo Innocenti ; Alessandro Lavacchi ; Carlo Andrea Massa ; Giorda...espandi
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/423654
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