Threshold Pressure for Disappearance of Size-Induced Effect in Spinel-Structure Ge3N4 Nanocrystals

Zhongwu Wang; Yusheng Zhao; D. Schiferl; Jiang Qian; Robert T. Downs; Ho Kwang Mao; T. Sekine

doi:10.1021/jp036436t

Threshold Pressure for Disappearance of Size-Induced Effect in Spinel-Structure Ge₃N₄ Nanocrystals

Zhongwu Wang, Yusheng Zhao, D. Schiferl, Jiang Qian, Robert T. Downs, Ho Kwang Mao, T. Sekine

Geosciences

Research output: Contribution to journal › Article › peer-review

28 Scopus citations

Abstract

We demonstrate that the incompressibility of spinel Ge₃N ₄ nanocrystals decreases when the pressure is elevated above ∼20 GPa. Ge₃N₄ nanocrystals initially exhibit a higher bulk modulus of 381(2) GPa. But, above 20 GPa, the bulk modulus is apparently reduced to 268(4) GPa, which is similar to the reported bulk modulus of 208-296 GPa for the bulk Ge₃N₄. Thus, a threshold pressure of ∼20 GPa was determined that signifies the onset of size-induced disappearance of elastic stiffness in nanocrystalline Ge₃N ₄. Enhanced surface energy contributions to the shell layers of nanoparticles and resulting effect on the corresponding large d spacing planes are used to elucidate the observed phenomenon. This study provides a reasonable explanation for the different compressibility properties of numerous nanocrystals.

Original language	English (US)
Pages (from-to)	14151-14153
Number of pages	3
Journal	Journal of Physical Chemistry B
Volume	107
Issue number	51
DOIs	https://doi.org/10.1021/jp036436t
State	Published - Dec 25 2003

ASJC Scopus subject areas

Physical and Theoretical Chemistry
Surfaces, Coatings and Films
Materials Chemistry

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title = "Threshold Pressure for Disappearance of Size-Induced Effect in Spinel-Structure Ge3N4 Nanocrystals",

abstract = "We demonstrate that the incompressibility of spinel Ge3N 4 nanocrystals decreases when the pressure is elevated above ∼20 GPa. Ge3N4 nanocrystals initially exhibit a higher bulk modulus of 381(2) GPa. But, above 20 GPa, the bulk modulus is apparently reduced to 268(4) GPa, which is similar to the reported bulk modulus of 208-296 GPa for the bulk Ge3N4. Thus, a threshold pressure of ∼20 GPa was determined that signifies the onset of size-induced disappearance of elastic stiffness in nanocrystalline Ge3N 4. Enhanced surface energy contributions to the shell layers of nanoparticles and resulting effect on the corresponding large d spacing planes are used to elucidate the observed phenomenon. This study provides a reasonable explanation for the different compressibility properties of numerous nanocrystals.",

author = "Zhongwu Wang and Yusheng Zhao and D. Schiferl and Jiang Qian and Downs, {Robert T.} and Mao, {Ho Kwang} and T. Sekine",

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T1 - Threshold Pressure for Disappearance of Size-Induced Effect in Spinel-Structure Ge3N4 Nanocrystals

AU - Wang, Zhongwu

AU - Zhao, Yusheng

AU - Schiferl, D.

AU - Qian, Jiang

AU - Downs, Robert T.

AU - Mao, Ho Kwang

AU - Sekine, T.

PY - 2003/12/25

Y1 - 2003/12/25

N2 - We demonstrate that the incompressibility of spinel Ge3N 4 nanocrystals decreases when the pressure is elevated above ∼20 GPa. Ge3N4 nanocrystals initially exhibit a higher bulk modulus of 381(2) GPa. But, above 20 GPa, the bulk modulus is apparently reduced to 268(4) GPa, which is similar to the reported bulk modulus of 208-296 GPa for the bulk Ge3N4. Thus, a threshold pressure of ∼20 GPa was determined that signifies the onset of size-induced disappearance of elastic stiffness in nanocrystalline Ge3N 4. Enhanced surface energy contributions to the shell layers of nanoparticles and resulting effect on the corresponding large d spacing planes are used to elucidate the observed phenomenon. This study provides a reasonable explanation for the different compressibility properties of numerous nanocrystals.

AB - We demonstrate that the incompressibility of spinel Ge3N 4 nanocrystals decreases when the pressure is elevated above ∼20 GPa. Ge3N4 nanocrystals initially exhibit a higher bulk modulus of 381(2) GPa. But, above 20 GPa, the bulk modulus is apparently reduced to 268(4) GPa, which is similar to the reported bulk modulus of 208-296 GPa for the bulk Ge3N4. Thus, a threshold pressure of ∼20 GPa was determined that signifies the onset of size-induced disappearance of elastic stiffness in nanocrystalline Ge3N 4. Enhanced surface energy contributions to the shell layers of nanoparticles and resulting effect on the corresponding large d spacing planes are used to elucidate the observed phenomenon. This study provides a reasonable explanation for the different compressibility properties of numerous nanocrystals.

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Threshold Pressure for Disappearance of Size-Induced Effect in Spinel-Structure Ge₃N₄ Nanocrystals

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