Exploring pressure-induced phase transitions of C3N4 with graphite structure by electrical resistance measurements

According to the theoretical calculations [1,2], (3 C3N4 and cubic-C3N4 are new superhard materials, be cause their bulk modulus is larger than that of diamond. Although the pure (3-C3N4 has been synthesized successfully [3-5], the pure cubic-C3N4 has not been obtained experimentally. Recently, pure...

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Published in:Carbon (New York) 2005, Vol.43 (5), p.1109-1111
Main Authors: Han, Yonghao, Gao, Chunxiao, Ma, Hongan, Luo, Jifeng, Hao, Aimin, Li, Yanchun, Li, Xiaodong, Liu, Jing, Li, Ming, Liu, Hongwu, Xie, Hongsen, Zou, Guangtian
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Language:English
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Summary:According to the theoretical calculations [1,2], (3 C3N4 and cubic-C3N4 are new superhard materials, be cause their bulk modulus is larger than that of diamond. Although the pure (3-C3N4 has been synthesized successfully [3-5], the pure cubic-C3N4 has not been obtained experimentally. Recently, pure C3N4 with graphite structure (g-C3N4) considered an important precursor for cubic-C3N4 synthesis under high pressure [2] has been synthesized successfully [6]. This progress provides an opportunity to study the structural phase transition of g-C3N4 under high pressure and is important to ex plore new phases of C3N4 including pure cubic-C3N4 In this paper, the electron transport behaviors of g C3N4 under high pressure were investigated by in situ resistance measurement both at ambient temperature and 77 K, and the phase transition information was well reflected.
ISSN:0008-6223
1873-3891
DOI:10.1016/j.carbon.2004.12.003