| The crystal structure of (Fe_4Cr_4Ni)_9C_4 |
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| 作者姓名： | SHI Nicheng MA Zhesheng XIONG Ming DAI Mingquan BAI Wenji FANG Qingsong YAN Binggang & YANG Jingsui . X-ray Diffraction Laboratory China University of Geosciences Beijing China . Institute of Geology Chinese Academy of Geological Sciences Beijing China |
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| 作者单位： | SHI Nicheng1，MA Zhesheng1，XIONG Ming1，DAI Mingquan1，BAI Wenji2，FANG Qingsong2，YAN Binggang2 & YANG Jingsui2 1. X-ray Diffraction Laboratory，China University of Geosciences，Beijing 100083，China; 2. Institute of Geology，Chinese Academy of Geological Sciences，Beijing 100037，China |
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| 摘 要： | The Luobusha podiform chromite deposit occursin the Luobusha ophiolite exposed at the In-dus-Yarlung Zangbo suture1]. The wall rocks of chro-mitites are harzburgites. Many mantle minerals werefound in chromitites and harzburgites. Among of them,there are 120 grains of diamond2], many elementalmetals (mainly Au, Cu, Fe, Ni, Cr, Al, W, Zn, Pb, Sn,Os, Ir, Ru, C, etc.) and their intermetallic compounds.Besides diamond and graphite, the element C isalso combined with Fe, Cr, Ni, Ti and …
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The crystal structure of (Fe4Cr4Ni)9C4 |
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| SHI Nicheng,MA Zhesheng,XIONG Ming,DAI Mingquan,BAI Wenji,FANG Qingsong,YAN Binggang & YANG Jingsui . X-ray Diffraction Laboratory,China University of Geosciences,Beijing ,China, . Institute of Geology,Chinese Academy of Geological Sciences,Beijing ,China.The crystal structure of (Fe_4Cr_4Ni)_9C_4[J].Science in China(Earth Sciences),2005,48(3). |
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| Authors: | Shi Nicheng Ma Zhesheng XIONG Ming DAI Mingquan BAI Wenji FANG Qingsong YAN Binggang YANG Jingsui |
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| Institution: | 1. X-ray Diffraction Laboratory, China University of Geosciences, Beijing 100083, China
2. Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China |
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| Abstract: | (Fe4Cr4Ni)9C4 is a metal carbide mineral formed by combination of Fe, Cr and Ni with C. It occurs in a chromite deposit in the Luobusha ophiolite, Tibet. Based on the determination of its crystal structure, the empirical formula is (Fe4.12Cr3.84Ni0.96)8.92C3.70 and the simplified formula is (Fe4Cr4Ni)4C9. The mineral is hexagonal with a = 1.38392(2) nm, c = 0.44690(9) nm,space group P63 m c, Z=6 and the calculated specific gravity Dx = 7.089 g/cm3. Fe, Cr and Ni occupy different crystallographic sites and their coordination numbers are approximately 12,forming an alternate stacking sequence of flat and puckered layers along the c axis. Some metallic atoms have a defect structure. The interatomic distances of Fe, Cr and Ni are 0.2525-0.2666 nm, and the distances between Fe, Cr, Ni and C are 0.1893-0.2169 nm. The coordination number of carbon is 6. It occurs in interstices of the metallic atoms Fe, Cr and Ni to form trigonal-prismatically coordinated polyhedra. These coordination polyhedra are linked with each other via shared corners or shared edges into a new type of metal carbide structure. |
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| Keywords: | Luobusha of Tibet metal carbide crystal structure |
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