High-pressure, high-temperature syntheses in the B-C-N-O system - I. Preparation and characterization
High-pressure, high-temperature syntheses in the B-C-N-O system - I. Preparation and characterization
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DOI：
10.1006/jssc.1997.7582
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发表时间：
1997-11-01
影响因子：
3.3
通讯作者：
McMillan, PF
中科院分区：
文献类型：
--
作者：
Hubert, H;Garvie, LAJ;McMillan, PF
我们用多砧压机合成了几种属于B-C-N-O体系的α-菱面体富硼材料。通过使B、C和B2 O3的混合物在5至7.5 GPa的压力范围和1700 ℃的温度下反应来制备B-C-O材料。粉末X射线衍射和平行电子能量损失谱与透射电子显微镜表明，所获得的BxCyOz相是基于α-菱面体B结构。生长出组成为B6C1.1O0.33至B6C1.28O0.31的晶体，其尺寸范围为1至20 μ m。小的透明luorescent的分裂薄片，获得接近B6 O的化学计量。在一些运行产物中还观察到碳化硼纳米棒的生长。我们报告了一种新的氮化硼B6 N1-x的第一个决定性的体合成，通过在7.5 GPa和1700 ℃下使B和六方BN反应获得。该化合物的结构是由α-菱面体B（空间群R（3）在barm$上）的结构衍生而来，精确的六方晶胞参数为a（h）5.457埃和c（h）= 12.241埃。(C)北京：科学出版社.
We synthesized several alpha-rhombohedral B-rich materials belonging to the B-C-N-O system using a multianvil press. B-C-O materials were prepared by reacting mixtures of B, C, and B2O3 in the 5 to 7.5 GPa pressure range and at a temperature of 1700 degrees C. Powder X-ray diffraction and parallel electron energy-loss spectroscopy with a transmission electron microscope showed that the BxCyOz phases obtained are based on the alpha-rhombohedral B structure. Crystals of composition B6C1.1O0.33 to B6C1.28O0.31 ranging in size from 1 to 20 mu m were grown. Small transparent lustrous red cleavage flakes were obtained for stoichiometries close to B6O. The growth of boron carbide nanorods was also observed in some of the run products. We report the first conclusive bulk synthesis of a new boron nitride, B6N1-x, obtained by reacting B and hexagonal BN at 7.5 GPa and 1700 degrees C. The structure of this compound is derived from that of alpha-rhombohedral B (space groupe R(3) over barm$) and the refined hexagonal cell parameters are a(h) 5.457 Angstrom and c(h) = 12.241 Angstrom. (C) 1997 Academic Press.