Nitrogen in diamond: evidence from thermal conductivity

Berman, R.; Hudson, Peter; Martínez, Marta Gil

doi:10.1088/0022-3719/8/21/003

Cited by 107 publications

(56 citation statements)

References 8 publications

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“…In this regime lowering T decreases the thermal occupation of phonons at all frequencies causing the phononphonon scattering rates to decrease and k nat and k pure to rise. We note that for P=0, our previously calculated k L as a function of temperature [26] was found to be in very good agreement with measured values [39,[49][50][51]. For P=125GPa k nat and k pure remain several times larger than the corresponding P=0 values throughout the range of temperatures above the peaks.…”

Section: Resultssupporting

confidence: 86%

Thermal conductivity of diamond under extreme pressure: A first-principles study

2012

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Using a first principles approach based on density functional perturbation theory and an exact numerical solution to the phonon Boltzmann equation, we show that application of large compressive hydrostatic pressure dramatically increases the thermal conductivity of diamond.We connect this enhancement to the overall increased frequency scale with pressure, which makes acoustic velocities larger and reduces phonon-phonon scattering rates. Of particular importance is the often neglected fact that heat-carrying acoustic phonons are coupled through lattice anharmonicity to higher frequency optic modes. An increase in optic mode frequencies with pressure weakens this coupling and contributes to driving the diamond thermal conductivities to far larger values than in any material at ambient pressure and temperature. 63.20.kg, 71.15Mb 2

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Section: Resultssupporting

confidence: 86%

Thermal conductivity of diamond under extreme pressure: A first-principles study

2012

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“…A-and B centres in total 49,50 . This is consistent with the 700-W m À 1 K À 1 thermal conductivity we measured by TDTR from that type 1A anvil 51 . The thermal conductivities of the type 1A anvils used in this paper varied from 600 to 800 W m À 1 K À 1 .…”

Section: Methodssupporting

confidence: 92%

Thermal conductance of metal–diamond interfaces at high pressure

2015

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The thermal conductance of interfaces between metals and diamond, which has a comparatively high Debye temperature, is often greater than can be accounted for by twophonon processes. The high pressures achievable in a diamond anvil cell (DAC) can significantly extend the metal phonon density of states to higher frequencies, and can also suppress extrinsic effects by greatly stiffening interface bonding. Here we report time-domain thermoreflectance measurements of metal-diamond interface thermal conductance up to 50 GPa in the DAC for Pb, Au 0.95 Pd 0.05 , Pt and Al films deposited on type 1A natural [100] and type 2A synthetic [110] diamond anvils. In all cases, the thermal conductances increase weakly or saturate to similar values at high pressure. Our results suggest that anharmonic conductance at metal-diamond interfaces is controlled by partial transmission processes, where a diamond phonon that inelastically scatters at the interface absorbs or emits a metal phonon.

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“…The K(T) results further show the magnitude of the maximum thermal conductivity /c max to be more than three orders of magnitude less than for graphite (inplane) 148 ' 149 and diamond. 150 The authors attribute their low value of the thermal conductivity K max to both a high density of defect states and a low Debye temperature in C 6 o (compared to graphite). To model the observed temperature dependence of K{T), two nearly degenerate molecular orientations are considered (differing by -12 meV in energy), and separated by an energy barrier of -260 meV.…”

Section: Lattice Contribution To the Thermal Conductivitymentioning

confidence: 99%

Fullerenes

1993

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A review of the structure and properties of fullerenes is presented. Emphasis is given to their behavior as molecular solids. The structure and property modifications produced by alkali-metal doping are summarized, including modification to the electronic structure, lattice modes, transport, and optical properties. Particular emphasis is given to the alkali-metal-doped fullerenes because of their importance as superconductors. A review of the structure and properties of fullerene-based graphene tubules is also given, including a model for their one-dimensional electronic band structure. Potential applications for fullerene-based materials are suggested.

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Nitrogen in diamond: evidence from thermal conductivity

Cited by 107 publications

References 8 publications

Thermal conductivity of diamond under extreme pressure: A first-principles study

Thermal conductivity of diamond under extreme pressure: A first-principles study

Thermal conductance of metal–diamond interfaces at high pressure

Fullerenes

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