Journal ArticleDOI
Transformation of the state of nitrogen in diamond
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In this paper, high temperature-high pressure annealing experiments on diamond transform type IB dispersed nitrogen into type IA aggregate nitrogen were conducted. The activation energy for the transformation was approximately 60 kcal mol−l (2.6 eV).Abstract:
High temperature–high pressure annealing experiments on diamond transform type IB dispersed nitrogen into type IA aggregate nitrogen. The activation energy for the transformation is approximately 60 kcal mol−l (2.6 eV). An estimate is given for the diffusivity of nitrogen in diamond for this transformationread more
Citations
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Mantle-derived fluids in diamond micro-inclusions
TL;DR: Micro-inclusions in diamonds from Zaire and Botswana differ in composition from the more common large inclusions of the peridotitic or eclogitic assemblages as discussed by the authors.
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Optical absorption and luminescence in diamond
TL;DR: In this paper, a review of the important point defects observed optically in diamond is presented, and the relevance of the experimental results to the current controversy about how to calculate the properties of point defects is brought out.
Journal ArticleDOI
Diamonds and the Geology of Mantle Carbon
Steven B. Shirey,Pierre Cartigny,Daniel J. Frost,Shantanu Keshav,Fabrizio Nestola,Paolo Nimis,D. Graham Pearson,Nikolai V. Sobolev,Michael J. Walter +8 more
TL;DR: For example, Harte et al. as mentioned in this paper found that diamond is a rare mineral, occurring at the part-per-billion level even within the most diamondiferous volcanic host rock although some rare eclogites have been known to contain 10−15% diamond.
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The formation of diamond
TL;DR: In this paper, a new approach to deciphering the origin of diamond is presented, involving the collation of all primary genetic information collected from large single crystals, and it is concluded that diamond monocrystals of both eclogitic and peridotitic parageneses took place during early igneous events within the mantle.
Journal ArticleDOI
The Kinetics of the Aggregation of Nitrogen Atoms in Diamond
Trevor Evans,Zengdu Qi +1 more
TL;DR: In this article, the authors reported work in which synthetic diamonds containing a high concentration of single nitrogen atoms have been heated in a temperature range of 1500 to 2500°C under various pressures.
References
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Journal ArticleDOI
Nitrogen, a major impurity in common type I diamond
W. Kaiser,W. L. Bond +1 more
TL;DR: In this article, it is shown that the strongest absorption bands in the infrared at 78, 83, 91, and 208 \ensuremath{\mu} are considered to be C-N molecular vibrations.
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Ultra‐High‐Pressure, High‐Temperature Apparatus: the ``Belt''
TL;DR: In this paper, the conical pistons push into each end of a specially shaped Carboloy chamber and receive lateral support from stressed binding rings, while still maintaining a pressure seal.
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Diamond growth rates and physical properties of laboratory-made diamond
H. M. Strong,R. M. Chrenko +1 more
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The A nitrogen aggregate in diamond-its symmetry and possible structure
TL;DR: In this article, the authors reported uniaxial stress measurements on the 30307 cm-1 absorption line of the A aggregates of nitrogen in diamond and showed that these aggregates are trigonal.
Journal ArticleDOI
Theoretical calculations of the enthalpies and entropies of diffusion and vacancy formation in semiconductors
TL;DR: In this article, the potential between nearest neighbor atoms is assumed to have the form of the Morse function, and the enthalpies and entropies of vacancy formation and diffusion have been calculated for elements having the diamond structure.