The crystal structure of (Fe4Cr4Ni)9C4

详细信息    查看全文

• 作者：Nicheng Shi (1)
  Zhesheng Ma (1)
  Ming Xiong (1)
  Mingquan Dai (1)
  Wenji Bai (2)
  Qingsong Fang (2)
  Binggang Yan (2)
  Jingsui Yang (2)
  
• 关键词：Luobusha of Tibet ; metal carbide ; crystal structure
• 刊名：Science China Earth Sciences
• 出版年：2005
• 出版时间：March 2005
• 年：2005
• 卷：48
• 期：3
• 页码：338-345
• 全文大小：758KB
• 参考文献：1. Bai, W. J., Zhou, M. F., Robinson, P. T. et al., Origin of Podiform Chromitites, Diamond and Associated Mineral Assemblage in the Luobusa Ophilite, Tibet, Beijing: Seismological Press (in Chinese), 2000, 1鈥?7.
  2. Bai, W. J., Yang, J. S., Robinson, P. T. et al., The investigation on diamond from ophilite chromit in Luobusa, Tibet, Acta Geology (in Chinese), 2001, 75(3): 404鈥?09.
  3. Feng, R., The Physics of Metals, Vol.1, The Structure and Defect (in Chinese), Beijing: Science Press, 2000, 11鈥?0.
  4. Fasiska, E. J., Jeffrey, G. A., On the cementite structure, Acta Crystallographica, 1965, 19: 463鈥?71. CrossRef
  5. Shi, N. C., Li, X. Z., Ma, Z. S. et al., Crystalline phases related to a decagonal ouasicrystal, I. A single crystal X-ray diffraction study of the orthorhomic Al3Mn phase, Acta Crystallographica, 1994, B50: 22鈥?0.
  6. Karren, P., Fjellvag, H., Kjekshus, A. et al., On the phase relations and structural and magnetic properties of the stable manganese carbides Mn23C6, Mn5C2 and Mn7C3, Acta Chemica Scanivica, 1991, 45: 549鈥?57. CrossRef
  7. Tibor, Z., Jamesh, H. S., Mineralogy, Concepts and Principles, Minneapolis, Minnesota: Burgess Publishing Company, 1985, 110鈥?13.
  8. Ma, Z. S., Shi, N. C., X-Ray Crystallography (in Chinese), Wuhan: China University of Geosciences Press, 1995, 199鈥?04.
  
• 作者单位：Nicheng Shi (1)
  Zhesheng Ma (1)
  Ming Xiong (1)
  Mingquan Dai (1)
  Wenji Bai (2)
  Qingsong Fang (2)
  Binggang Yan (2)
  Jingsui Yang (2)
  
  1. X-ray Diffraction Laboratory, China University of Geosciences, 100083, Beijing, China
  2. Institute of Geology, Chinese Academy of Geological Sciences, 100037, Beijing, China
  
• ISSN：1869-1897

文摘

(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, pace 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 trigonalprismatically coordinated polyhedra. These coordination polyhedra are linked with each other via shared corners or shared edges into a new type of metal carbide structure.