Study on Structure and Phase Transformation Laws of Natural FeS2 Whisker by Raman Spectroscopy
HUANG Fei1, KOU Da-ming1, YAO Yu-zeng1, NI Pei2, DING Jun-ying2
1. Northeastern University of China, Shenyang 110004, China 2. State Key Laboratory for Mineral Deposits Research，Nanjing University, Nanjing 210008, China
Abstract：FeS2 belongs to sulfide, including pyrite of isometric system and marcasite of orthorhombic system. The FeS2 discovered in Gengzhuang, Shanxi Province, was growing in the form of whisker. The study with scanning electron microscopy and electron probe show that the mineral components of FeS2 vary regularly. The structure of natural nano-micron FeS2 whisker was determined by micro-Raman spectroscopy. The results show that there exist two types of structure in FeS2 whiskers: pyrite and marcasite. Marcasite presents irregular shapes, such as coarse lotus root joints, crude columnar or beaded. Pyrite exists in the shape of straight line and smooth surface. In the early growing stage, Gengzhuang FeS2 whisker was mainly marcasite-type structure; in the middle stage it was coexistent structure of pyrite- and marcasite-type; in the late stage it was mainly pyrite-type. The growing stages of the whisker FeS2 show the phase transformation laws. Moreover, during the growing process marcasite was growing with pyrite coated on. Study on FeS2 whisker structure shows that there are correlations between phase transformation laws of the structure and forms, and between the forming time and the composition characteristics.
[1] PAN Zhao-lu, ZHAO Ai-xing, PAN Tie-hong(潘兆橹，赵爱醒，潘铁红). Crystallography and Mineralogy(Last Volume)(结晶学及矿物学, 下册). Beijing: Geological Press(北京:地质出版社)1998. 236. [2] WANG Pu, PAN Zhao-lu, WENG Ling-bao, et al(王 濮，潘兆橹，翁玲宝, 等). System of Mineralogy(Last Volume)(系统矿物学, 下册). Beijing: Geological Press(北京:地质出版社), 1982. 275. [3] Branner S S. Seience，1958，128:569. [4] Bonev I K, Reiche M, Marinov M, et al. Physics and Chemistry of Minerals, 1985, 12(4): 223. [5] Galuskin Eugeny, Winiarski Antoni. Monatshefte, 1997, 5: 229. [6] Ivan K Bonev, Juan Manuel, Garcia-Ruiz, et al. European Journal of Mineralogy, 2005, 17(6): 905. [7] HUANG Fei, JIN Cheng-zhu, BIAN Wei-min, et al(黄 菲，金成洙，边为民，等). Acta Mineralogica Sinica(矿物学报), 2004, 24(4): 429. [8] HUANG Fei, JIN Cheng-zhu, BIAN Wei-min, et al(黄 菲，金成洙，边为民，等). Earth Science Frontiers(地学前缘), 2005, 12(2): 142. [9] HUANG Fei, JIN Cheng-zhu, YAO Yu-zeng, et al(黄 菲，金成洙，姚玉增，等). Acta Mineralogica Sinical(矿物学报), 2006, 24(3): 312. [10] HUANG Fei, JIN Cheng-zhu, YAO Yu-zeng, et al(黄 菲，金成洙，姚玉增，等). Bulletin of Mineralogy, Petrology and Geochemistry(矿物岩石地球化学通报), 2005, 24: 85. [11] HUANG Fei, JIN Cheng-zhu, YAO Yu-zeng, et al(黄 菲，金成洙，姚玉增，等). Journal of Jilin University(Earth Science Edition(吉林大学学报, 地球科学版), 2005, (3): 313. [12] CHEN Jing-zhong(陈敬中). Geological Science and Technology Information(地质科技情报), 1994, (3): 38. [13] YIN Jian-zhao(银剑钊). Earth Science Frontiers(地学前缘), 1994, (3): 1. [14] LIAO Zong-ting, YUAN Yuan(廖宗廷，袁 媛). Copper Engineering(铜业工程), 2004, (3): 1. [15] WANG Wen-kui, WANG Ji-yang, ZHAO San-rong(王文魁, 王继扬, 赵珊茸). Crystal Morphology(晶体形貌学). Wuhan: China University of Geosciences Press(武汉:中国地质大学出版社), 2001. 125. [16] XU Pei-cang, LI Ru-bi(徐培苍，李如壁). Raman Spectroscopy in Geosciences(地学中的拉曼光谱). Xi’an: Shaanxi Science and Technology Press(西安: 陕西科学技术出版社), 1996. 6. [17] HE Mo-chun, ZHANG Zhi-jian(何谋春，张志坚). Rock and Mineral Analysis(岩矿测试), 2001, 20(1): 43. [18] LI Ying, DUAN Yu-ran, LI Wei-hua(李 颖，段玉然，李维华). Spectroscopy and Spectral Analysis(光谱学与光谱分析), 2002, 22(5): 783.
