Thermal diffusivity of isotopically enriched<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">C</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>12</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow></mml:math>diamond

Anthony, T. R.; Banholzer, W. F.; Fleischer, James F.; Wei, Lin; Kuo, P. K.; Thomas, R. L.; Pryor, Roger W.

doi:10.1103/physrevb.42.1104

Cited by 429 publications

(155 citation statements)

References 6 publications

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“…Indeed, experiments by Anthony et al 31 found that the thermal conductivity of diamond at room temperature increased by 50% when the concentration of isotope 13 C was reduced by a factor of 15! Their remarkable discovery led to a patent 32 and stimulated a number of studies to understand the sensitive behavior of diamond thermal conductivity to the isotopic purity.…”

Section: Isotopic Substitutionsmentioning

confidence: 99%

See 1 more Smart Citation

Thermal conductivity of diamond and related materials from molecular dynamics simulations

Che

Çağın

Deng

et al. 2000

The Journal of Chemical Physics

320

235

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Based on the Green-Kubo relation from linear response theory, we calculated the thermal current autocorrelation functions from classical molecular dynamics ͑MD͒ simulations. We examined the role of quantum corrections to the classical thermal conduction and concluded that these effects are small for fairly harmonic systems such as diamond. We then used the classical MD to extract thermal conductivities for bulk crystalline systems. We find that ͑at 300 K͒ 12 C isotopically pure perfect diamond has a thermal conductivity 45% higher than natural ͑1.1% 13 C͒ diamond. This agrees well with experiment, which shows a 40%-50% increase. We find that vacancies dramatically decrease the thermal conductivity, and that it can be described by a reciprocal relation with a scaling as n v Ϫ␣ , with ␣ϭ0.69Ϯ0.11 in agreement with phenomenological theory (␣ϭ1/2 to 3/4͒. Such calculations of thermal conductivity may become important for describing nanoscale devices. As a first step in studying such systems, we examined the mass effects on the thermal conductivity of compound systems, finding that the layered system has a lower conductivity than the uniform system.

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Section: Isotopic Substitutionsmentioning

confidence: 99%

“…͑47͒ leads to a mean free path for acoustic phonons of Lϭ174 nm. The experimental values 30,31 are ϭ3.5 g/cm 3 , C p ϭ0.11 cal/g/K, ␤ T ϭ0.0022 GPa Ϫ1 , and v ϭ11.4 km/s. Using the experimental value of ϭ33 w/cm/K, leads to Lϭ494 nm.…”

Section: A Bulk Diamond Isotopically Purementioning

confidence: 99%

Thermal conductivity of diamond and related materials from molecular dynamics simulations

Che

Çağın

Deng

et al. 2000

The Journal of Chemical Physics

320

235

View full text Add to dashboard Cite

show abstract

“…The thermal conductivity has been shown to be very sensitive to the isotopic disorder percentage in the low disorder region with more than 40% reduction of thermal conductivity by less than 5% isotopic disorder percentage; while for higher disorder percentage, the thermal conductivity keeps almost unchanged. 24,25,26 So the thermal conductivity can be greatly enhanced by synthesizing isotopically pure nanotubes. 26 In conclusion, we have used MD to obtain the thermal vibration of graphene and then calculated the Young's modulus from the thermal mean-square vibration amplitude.…”

mentioning

confidence: 99%

Young’s modulus of graphene: A molecular dynamics study

2009

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The Young's modulus of graphene is investigated through the intrinsic thermal vibration in graphene which is 'observed' by molecular dynamics, and the results agree very well with the recent experiment [Science 321, 385 (2008)]. This method is further applied to show that the Young's modulus of graphene: (1). increases with increasing size and saturates after a threshold value of the size; (2). increases from 0.95 TPa to 1.1 TPa as temperature increases in the region [100, 500]K;(3). is insensitive to the isotopic disorder in the low disorder region (< 5%), and decreases gradually after further increasing the disorder percentage.

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“…Therefore, the thermal diffusivity of the sample has to be calculated from the entire mirage measurement data, which contains information of the thermal properties of both the sample and the gas, and the measurement parameters [10]. A suitable data analyzing method is multi-parameter least-squares regression fitting developed by Kuo et al that has already been successfully applied to the thermal diffusivity determination of diamonds [4].…”

Section: Introductionmentioning

confidence: 99%

“…However, this can be measured by the optical beam deflection (OBD, mirage) technique [3]. Already the method has been applied to higher diffusivity samples than polymers, covering the range between 20 -0.02 cm 2 /s [4,5,6,7].…”

Section: Introductionmentioning

confidence: 99%