Crystal structure and magnetic properties of the R₆Si₄Se₁₇ (R = La and Ce) compounds

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• 作者：O.V. Marchuk^a ; M. Daszkiewicz^b ; L.D. Gulay^c ; D. Kaczorowski^b ; ^{D.Kaczorowski@int.pan.wroc.pl}
• 关键词：Chalcogenides ; Rare earth compounds ; Si compounds ; Se compounds ; Crystal structure ; X-ray diffraction ; Magnetic properties
• 刊名：Journal of Alloys and Compounds
• 出版年：2012
• 期刊代码：45_09258388
• 类别：ms
• 出版时间：5 July, 2012
• 卷：528
• 期：Complete
• 页码：99-102
• 文件大小：458 K

摘要

The crystal structure of the R₆Si₄Se₁₇ (R = La and Ce) selenides was studied by means of X-ray powder and single crystal diffraction. The magnetic behaviour of the Ce-based compound was determined through SQUID magnetometry. The two materials crystallize with the Ce₆Si₄S₁₇ structure type (space group , Pearson symbol aP54). Their unit cells comprise as many as six inequivalent positions of the rare-earth atoms. The compound Ce₆Si₄Se₁₇ exhibits Curie-Weiss paramagnetism with no hint at any magnetic ordering down to 1.72 K. The magnetic susceptibility data indicates that the Ce ions in this compound may have fluctuating valence character.