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

被引：14

作者：

Daszkiewicz, M. ^{[1
]}

Marchuk, O. V. ^{[2
]}

Gulay, L. D. ^{[3
]}

Kaczorowski, D. ^{[1
]}

机构：

[1] Polish Acad Sci, Inst Low Temp & Struct Res, PL-50950 Wroclaw, Poland

[2] Volyn Natl Univ, Dept Inorgan & Phys Chem, UA-43009 Lutsk, Ukraine

[3] Volyn Natl Univ, Dept Ecol & Protect Environm, UA-43009 Lutsk, Ukraine

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2012年 / 519卷

关键词：

Rare earth compounds; Chalcogenides; Crystal structures; X-ray single crystal diffraction; X-ray powder diffraction; Magnetic properties; CHALCOGENIDES;

D O I：

10.1016/j.jallcom.2011.12.097

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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. (C) 2011 Elsevier B. V. All rights reserved.

引用

页码：85 / 91

页数：7

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