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

被引：26

作者：

Di Benedetto, Francesco ^{[1
]}

Borrini, Daniele ^{[2
]}

Caneschi, Andrea ^{[1
]}

Fornaciai, Gabriele ^{[1
]}

Innocenti, Massimo ^{[1
]}

Lavacchi, Alessandro ^{[3
]}

Massa, Carlo Andrea ^{[4
]}

Montegrossi, Giordano ^{[5
]}

Oberhauser, Werner ^{[3
]}

Pardi, Luca A. ^{[4
]}

Romanelli, Maurizio ^{[1
]}

机构：

[1] Univ Florence, Dipartimento Chim, Florence, Italy

[2] Univ Florence, Dipartimento Sci Terra, I-50121 Florence, Italy

[3] Ist Chim Composti Organometall, Consiglio Nazl Ric, Florence, Italy

[4] Ist Proc Chim Fis, Consiglio Nazl Ric, Pisa, Italy

[5] Ist Geosci Georisorse, Consiglio Nazl Ric, Florence, Italy

来源：

PHYSICS AND CHEMISTRY OF MINERALS | 2011年 / 38卷 / 06期

关键词：

Synthetic kuramite; Cu3SnS4; Stannite; Sphalerite; EPR; SQUID; Cation ordering; Cu(II); XRPD; SEM; TEM; STANNITE; KESTERITE; CU2FESNS4; SERIES; SQUID; EPR;

D O I：

10.1007/s00269-011-0421-8

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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)(2)Cu(II)SnS4 and of a random distribution of Cu(II), Cu(I) and Sn(IV) ions within the available tetrahedral sites.

引用

页码：483 / 490

页数：8

共 23 条

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