Valence and Magnetic Investigations of Alkali Metal-Doped Europium Sulfide

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• 作者：William L. Boncher ; Edward A. G枚rlich ; Krzysztof Tomala ; Julie L. Bitter ; Sarah L. Stoll
• 刊名：Chemistry of Materials
• 出版年：2012
• 出版时间：November 27, 2012
• 年：2012
• 卷：24
• 期：22
• 页码：4390-4396
• 全文大小：292K
• 年卷期：v.24,no.22(November 27, 2012)
• ISSN：1520-5002

文摘

Using europium sesquioxide nanowires as a starting material for the synthesis of europium sulfides, we have discovered alkali metal doping Eu_1鈥?i>xNa_xS for the first time. Alkali metal doping stabilizes the NaCl structure type of EuS at surprisingly low temperatures. We investigated the europium valence through XPS and M枚ssbauer spectroscopy as a function of dopant in Eu_1鈥?i>xNa_xS for x = 0鈥?.5. In addition, based on magnetic studies, the ferromagnetic ordering is diminished by the presence of the nonmagnetic dopant, causing a decrease in the ordering temperature.

Keywords:

chText=europium+sulfide&qsSearchArea=searchText">europium sulfide; sodium-doping; XPS; ¹⁵¹Eu M枚ssbauer