Reactions of alkaline earth metals and nitrogen in sealed niobium ampoules: the formation of MgZn2 type intermetallic phases in the presence of nitrogen and the new compound Ba5[NbN4]N
Reactions of alkaline earth metals and nitrogen in sealed niobium ampoules: the formation of MgZn2 type intermetallic phases in the presence of nitrogen and the new compound Ba5[NbN4]N
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DOI：
10.1016/j.jallcom.2004.04.082
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发表时间：
2004-12
影响因子：
6.2
通讯作者：
O. Reckeweg;Cora Lind;A. Simon;F. Disalvo
中科院分区：
文献类型：
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作者：
O. Reckeweg;Cora Lind;A. Simon;F. Disalvo
碱土金属或其对应的氮化物与作为氮供体的NaN_3在不同温度下在清洁的密封Nb安瓶中反应，产生已知的相‘β-Ca3N’和透明的橙色板状Ba5[NbN]N单晶。用单晶X射线衍射法测定了该新化合物的晶体结构(C2/m(NO.12)，a=1231.7(3)，b=1094.6(2)，c=853.8(2)Pm，β=113.65(3)°和Z=4)。在1000℃的≥温度下，有效氮明显与Nb容器壁反应，形成金属间化合物相。通过X射线单晶结构分析，重新确定了AeMg2(MgZ2型，Ae=Ca，Yb，Sr，Eu和Ba)的晶体结构，以确定结构空位中是否存在氮。描述了三元氮化物和金属间化合物的结构，并与已知化合物进行了比较。
Reactions between alkaline earth metals or their corresponding nitrides and NaN3as nitrogen donor in cleaned sealed Nb ampoules at different temperatures yields known phases, ‘β-Ca3N2’ and single crystals in the form of transparent, orange plates of Ba5[NbN4]N. The crystal structure of this new compound was determined by means of single crystal X-ray diffraction (C2/m (no. 12), a=1231.7(3),b=1094.6(2),c=853.8(2) pm ,β=113.65(3)° and Z=4). At temperatures ≥1000°C, the available nitrogen apparently reacts with the Nb container walls and intermetallic phases are formed. The crystal structures of AeMg2(MgZn2type with Ae=Ca, Yb, Sr, Eu and Ba) were re-determined by X-ray single crystal structure analyses on crystals obtained in such reactions to ascertain the presence or absence of nitrogen in structural voids. The structures of the ternary nitride and intermetallic phases are described and compared to known compounds.