کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1616537 | 1516374 | 2012 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Crystal structures and magnetic properties of R2PbSi2S8 (R = Y, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho), R2PbSi2Se8 (R = La, Ce, Pr, Nd, Sm, Gd) and R2PbGe2S8 (R = Ce, Pr) compounds Crystal structures and magnetic properties of R2PbSi2S8 (R = Y, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho), R2PbSi2Se8 (R = La, Ce, Pr, Nd, Sm, Gd) and R2PbGe2S8 (R = Ce, Pr) compounds](/preview/png/1616537.png)
The crystal structures of several novel quaternary compounds R2PbSi2S8 (R = Y, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho), R2PbSi2Se8 (R = La, Ce, Pr, Nd, Sm, Gd) and R2PbGe2S8 (R = Ce, Pr) have been determined by means of single-crystal and powder X-ray diffraction. All these phases crystallize with hexagonal unit cells of the La2PbSi2S8 type (space group R-3c, Pearson symbol hR78), in which rare-earth and lead atoms are statistically distributed over centers of bi-capped trigonal prisms made by chalcogen atoms. The magnetic properties of R2PbSi2S8 and R2PbSi2Se8 with R = La, Ce, Pr and Sm have been studied in wide temperature and magnetic field ranges. The La-based materials are weakly diamagnetic, whereas all the other compounds exhibit strongly temperature dependent paramagnetic behaviour due to the presence of well localized magnetic moments of trivalent rare-earth ions.
Journal: Journal of Alloys and Compounds - Volume 519, 5 April 2012, Pages 85–91