Initial description of a bulk crystalline carbon-nitride phase

Dymont, V. P.; Nekrashevich, E. M.; Starchenko, I. M.

doi:10.1016/s0038-1098(99)00222-7

Cited by 9 publications

(1 citation statement)

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“…This C-N bond, which is shorter than the C-C bond in diamond, is the origin of incompressibility comparable to or beyond that of diamond. Many synthetic studies on superhard C 3 N 4 have been conducted over the last two decades, including chemical and physical vapor depositions, [5][6][7][8] the implantation of nitrogen ions into graphite, 9) and direct synthesis under high pressure, [10][11][12][13][14][15][16][17][18][19][20][21][22][23] but no conclusive report on its synthesis have been obtained until now. In the course of synthetic studies on superhard carbon nitride, Bordon et al synthesized the crystalline C 2 N 2 (NH) at high pressure and high temperature with the use of a C 2 N 4 H 4 precursor.…”

Section: Introductionmentioning

confidence: 99%

Crystal Structure of New Carbon–Nitride-Related Material C₂N₂(CH₂)

Sougawa

Sumiya

Takarabe

et al. 2011

Jpn. J. Appl. Phys.

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A new carbon-nitride-related C 2 N 2 (CH 2 ) nanoplatelet was synthesized by subjecting a precursor C 3 N 4 H x O y nanoparticle in a laser-heating diamond anvil cell to the pressure of 40 GPa and temperature of 1200-2000 K. The C and N composition of the quenched sample was determined to be C 3 N 2 by using an energy dispersive X-ray spectroscope attached to a transmission electron microscope. The crystal structure and atomic positions of this C 3 N 2 were obtained through Rietveld analysis of the X-ray diffraction pattern measured using synchrotron radiation. The hydrogen composition was difficult to determine experimentally because of the several-hundred-nanometer dimensions of the sample. Firstprinciples calculation was alternatively used to discover the hydrogen composition. The synthesized C 2 N 2 (CH 2 ) was accordingly found to be an orthorhombic unit cell of the space group Cmc2 1 with lattice constants a ¼ 7:625 A, b ¼ 4:490 A, and c ¼ 4:047 A. If the CH 2 atomic unit is replaced with the CN 2 atomic unit and the bonding rearranged, the C 2 N 2 (CH 2 ) becomes the expected superhard C 3 N 4 .

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Section: Introductionmentioning

confidence: 99%

Crystal Structure of New Carbon–Nitride-Related Material C₂N₂(CH₂)

Sougawa

Sumiya

Takarabe

et al. 2011

Jpn. J. Appl. Phys.

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High Pressure Phase Transformations

Kunz

2013

Materials Science and Technology

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The sections in this article are Introduction Pressure‐Driven Phase Transitions Framework Flexion Increase in Coordination Number Pressure‐Induced Ordering Generating High Pressure Dynamic Pressure Generation Static Pressure Devices Large‐Volume Presses Diamond Anvil Cells Probing Phase Transformations in Materials at High Pressure Volumetric Techniques Spectroscopic Techniques Microscopy R aman and Infrared Spectroscopy Mössbauer Spectroscopy X‐Ray Absorption Spectroscopy NMR Ultrasonic Sound Velocity Diffraction Techniques X‐Ray Diffraction Neutron Diffraction Examples Zincblende‐Type Semiconductors Si and Ge Ga As In Sb Materials in the B – C – N System C B  N C  N B  C B  C  N H 2 O Ice Ih , XI and Ic Ice II Ice III and Ice IX Ice V , Ice IV and Ice XII Ice VI , Ice VII , Ice VIII , Ice X Amorphous Ice at High Pressure Acknowledgements

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