Crystal structures and compressibility of novel iron borides Fe2B7 and FexB50 synthesized at high pressure and high temperature
Crystal structures and compressibility of novel iron borides Fe2B7 and FexB50 synthesized at high pressure and high temperature
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DOI：
10.1016/j.jssc.2015.06.040
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发表时间：
2015-10-01
影响因子：
3.3
通讯作者：
Dubrovinskaia, N.
中科院分区：
文献类型：
--
作者：
Bykova, E.;Gou, H.;Dubrovinskaia, N.
我们在此详细描述了在高压和高温下合成的具有不同铁含量（x=1.01(1)、1.04(1)、1.32(1)）的新型硼化物 Fe2B7 和 FexB50 的晶体结构。高压单晶X射线衍射表明，Fe2B7的结构具有短的不可压缩B-B键，这使得它在一个晶体方向上像金刚石一样坚硬。 Fe2B7的体积压缩率（体积模量K-0 = 259（1.8）GPa，K-0' = 4（固定））甚至低于FeB4，与3d金属硼化物中以高体积模量而闻名的MnR4相当。 FexB50采用四方δl-B结构，其中Fe原子占据间隙位置。 FexB50 的弹性行为没有表现出相当大的各向异性。 (C) 2015 Elsevier Inc. 保留所有权利。
We present here a detailed description of the crystal structures of novel iron borides, Fe2B7 and FexB50 with various iron content (x=1.01(1), 1.04(1), 1.32(1)), synthesized at high pressures and high temperatures. As revealed by high-pressure single-crystal X-ray diffraction, the structure of Fe2B7 possesses short incompressible B-B bonds, which make it as stiff as diamond in one crystallographic direction. The volume compressibility of Fe2B7 (the bulk modulus K-0 = 259(1.8) GPa, K-0' = 4 (fixed)) is even lower than that of FeB4 and comparable with that of MnR4, known for high bulk moduli among 3d metal borides. FexB50 adopts the structure of the tetragonal delta l-B, in which Fe atoms occupy an interstitial position. FexB50 does not show considerable anisotropy in the elastic behavior. (C) 2015 Elsevier Inc. All rights reserved.