Crystal structures and compressibility of novel iron borides Fe2B7 and FexB50 synthesized at high pressure and high temperature

被引：10

作者：

Bykova, E. ^{[1
,2
]}

Gou, H. ^{[2
]}

Bykov, M. ^{[2
]}

Hanfland, M. ^{[3
]}

Dubrovinsky, L. ^{[1
]}

Dubrovinskaia, N. ^{[2
]}

机构：

[1] Univ Bayreuth, Bavarian Res Inst Expt Geochem & Geophys, D-95440 Bayreuth, Germany

[2] Univ Bayreuth, Crystallog Lab, D-95440 Bayreuth, Germany

[3] European Synchrotron Radiat Facil, F-38043 Grenoble, France

来源：

JOURNAL OF SOLID STATE CHEMISTRY | 2015年 / 230卷

关键词：

Crystal structure; Mechanical properties; High pressure; X-ray diffraction; TUNGSTEN TETRABORIDE; BORON; SUPERHARD;

D O I：

10.1016/j.jssc.2015.06.040

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

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.

引用

页码：102 / 109

页数：8

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