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Anomalous phonon so...
Anomalous phonon softening of G-band in compressed graphitic carbon nitride due to strong electrostatic repulsion
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Yang, Zhenxing (författare)
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Mahmood, Javeed (författare)
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Niu, Shifeng (författare)
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Tian, Hui (författare)
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Ji, Tingting (författare)
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Liu, Cailong (författare)
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Baek, Jong-Beom (författare)
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- Sundqvist, Bertil (författare)
- Umeå universitet,Institutionen för fysik
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Yao, Mingguang (författare)
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Liu, Bingbing (författare)
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(creator_code:org_t)
- American Institute of Physics (AIP), 2021
- 2021
- Engelska.
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Ingår i: Applied Physics Letters. - : American Institute of Physics (AIP). - 0003-6951 .- 1077-3118. ; 118:2
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Graphitic carbon nitride (C2N and C3N) with various p electron distributions on layers have been studied under pressure through acombined theoretical and experimental approach and a comparison with graphite. It is found that as these materials transform into lowcompressibility phases in the pressure range from 15 to 45 GPa, strong electrostatic repulsion between p electrons and in-plane sp2 electronsmay distort and soften the sp2 bonds, leading to anomalous pressure evolutions of the intralayer phonon vibrations, such as a plateau-likebehavior of E2g mode (G-band) in C2N and C3N. This also causes a slow increase in the resistivity/resistance of C2N and C3N as pressureincreases, and the gradual interlayer bonding leads to an abrupt increase in resistance of the materials but with different pressure responsesdue to their different p electron distributions. Moreover, the intensity enhancement of the G band in both CN materials may be related totheir electronic structure changes. The results deepen our understanding of the effects of p electron distribution on the structural transitionof graphitic materials and may explain some unexplained in previous studies.
Ämnesord
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
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Yang, Zhenxing
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Mahmood, Javeed
-
Niu, Shifeng
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Tian, Hui
-
Ji, Tingting
-
Liu, Cailong
-
visa fler...
-
Baek, Jong-Beom
-
Sundqvist, Berti ...
-
Yao, Mingguang
-
Liu, Bingbing
-
visa färre...
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Umeå universitet