TY - JOUR
T1 - Structure and stability of carbon nitride under high pressure and high temperature up to 125 GPa and 3000 K
AU - Kojima, Yohei
AU - Ohfuji, Hiroaki
N1 - Funding Information:
The synchrotron experiments were conducted at BL10XU of SPring-8 with the approval of JASRI (Proposal Nos. 2010A1545 and 2010B1588). This work was supported by Global COE program of Ehime University “Center for Advanced Experimental and Theoretical Deep Earth Mineralogy” and also partly by Grant-in-Aid for Young Scientists (B) (# 20740255 , Representative: H. Ohfuji) from Ministry of Education, Science and Culture, Japan. The authors thank T. Irifune and T. Yagi of Ehime University for their discussion and encouragement.
PY - 2013
Y1 - 2013
N2 - The crystal structure of carbon nitride under high pressure and temperature was investigated up to megabar pressures using graphitic C3N 4 as a starting material. It transformed to an orthorhombic phase above 30 GPa and 1600 K, which has a similar unit cell parameters (a = 7.6251(19), b = 4.4904(8), and c = 4.0424(8) Å at 1 atm) to those of reported hydrogen-bearing carbon nitride phases such as C2N 2(NH) and C2N2(CH2). Although the C:N ratio of this orthorhombic phase was carefully determined to be 3:4, FT-IR analysis showed a strong possibility of hydrogen contamination both in the starting and recovered samples. These results suggest that in the studied wide pressure and temperature range, hydrogen-bearing carbon nitride favors the orthorhombic structure with a fundamental composition of C2N 2X where NH, CH2, and even potentially vacancies can be flexibly accommodated in the X site.
AB - The crystal structure of carbon nitride under high pressure and temperature was investigated up to megabar pressures using graphitic C3N 4 as a starting material. It transformed to an orthorhombic phase above 30 GPa and 1600 K, which has a similar unit cell parameters (a = 7.6251(19), b = 4.4904(8), and c = 4.0424(8) Å at 1 atm) to those of reported hydrogen-bearing carbon nitride phases such as C2N 2(NH) and C2N2(CH2). Although the C:N ratio of this orthorhombic phase was carefully determined to be 3:4, FT-IR analysis showed a strong possibility of hydrogen contamination both in the starting and recovered samples. These results suggest that in the studied wide pressure and temperature range, hydrogen-bearing carbon nitride favors the orthorhombic structure with a fundamental composition of C2N 2X where NH, CH2, and even potentially vacancies can be flexibly accommodated in the X site.
KW - Carbon nitride
KW - Diamond anvil cell
KW - High-pressure and high-temperature
KW - In-situ X-ray diffraction
KW - Microstructure
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U2 - 10.1016/j.diamond.2013.07.006
DO - 10.1016/j.diamond.2013.07.006
M3 - Article
AN - SCOPUS:84882746497
VL - 39
SP - 1
EP - 7
JO - Diamond and Related Materials
JF - Diamond and Related Materials
SN - 0925-9635
ER -