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article

Growth and mechanical properties of diamond films on cemented carbide with buffer layers

M.N. Liu, Y.B. Bian, S.J. Zheng, T. Zhu, more

Thin Solid Films > 2015 > 584 > Complete > 165-169

The main hindrance to applications of diamond coatings on cemented carbide cutting tools is poor adhesion between diamond films and the substrates, caused mainly by Co acting as a catalyst for the formation of graphite during the growth of the diamond films. The buffer-layer technique is commonly used to reduce the elemental diffusion or residual stress in the interface between the film and substrate...

article

Thermal conductivity of a diamond magnetite composite fluid under the effect of a uniform magnetic field

R.A. Medina-Esquivel, C. Vales-Pinzon, G. Quiñones-Weiss, M.A. Zambrano-Arjona, more

We study the thermal diffusion through a fluid made of diamond microparticles immersed in a ferrofluid. A thermal conductivity enhancement is observed when a magnetic field is applied to the fluid; this phenomenon is due to a better heat propagation through a tridimensional chain-like structuring formed by the diamond particles in the direction of the field; additionally the thermal conductivity of...

article

First finding of microdiamond, coesite and other UHP phases in felsic granulites in the Moldanubian Zone: Implications for deep subduction and a revised geodynamic model for Variscan Orogeny in the Bohemian Massif

Maria Perraki, Shah Wali Faryad, M. Perraki, S.W. Faryad

LITHOS > 2014 > 202-203 > Complete > 157-166

Heavy mineral fractions and polished thin sections from felsic granulites from the Moldanubian Zone of the Bohemian Massif were thoroughly studied by means of Raman microspectroscopy combined with optical microscopy and scanning electron microscopy. The following phases were identified, among others, as inclusions in robust minerals such as garnet and zircon: Diamond, characterized by an intense narrow...

article

Typomorphic characteristics of the Ural diamonds (from FTIR spectroscopy data)

E.N. Fedorova, A.M. Logvinova, L.I. Luk’yanova, N.V. Sobolev, more

Russian Geology and Geophysics > 2013 > 54 > 12 > 1458-1470

Natural diamonds from the Ural alluvial deposits have been studied by FTIR spectroscopy. It is shown that these diamonds are similar in some typomorphic features, such as nitrogen content and aggregation state, to the diamonds of the Coromandel (Brazil) and Verkhnee Molodo (Lena region, Yakutia) placers and to the diamonds from kimberlites of the Arkhangel’sk Region but differ significantly in lower...

article

Effective thermal conductivity of disperse materials. I. Compliance of common models with experimental data

Andrey M. Abyzov, Andrey V. Goryunov, Fedor M. Shakhov, A.M. Abyzov, more

International Journal of Heat and Mass Transfer > 2013 > 67 > Complete > 752-767

The thermal conductivity of packed beds of various materials (metals, ceramics, superhard materials, polymers, etc.) is measured by the steady-state heat flux method at room temperature in air. Powders and granular materials are used, with particle sizes ranging mainly from 50μm to 1.5mm, with various particle shapes (debris, pebble, cubo–octahedral single-crystals, regular spheres), the thermal conductivity...

article

Crystal forms of natural microdiamonds

Victor Kvasnytsya, V. Kvasnytsya

Geometrical crystallographic features of rare diamond micro-crystals (0.3–0.5mm in diameter) from kimberlites having different complex flat and smooth faces are described. Such polyhedrons of microdiamonds are typically composed of two or more combinations of seven different crystal forms belonging to hexoctahedral symmetry class: octahedron, cube, rhombic dodecahedron, trisoctahedron, trapezohedron,...

article

Fabrication of n‐Type Doped V‐Shaped Structures on (100) Diamond

Christoph Schreyvogel, Solange Temgoua, Christian Giese, Volker Cimalla, more

physica status solidi (a) > 218 > 7 > n/a - n/a

Herein, a technological process for the fabrication of n‐type doped V‐shaped structures on (100) single‐crystalline diamond substrates, designed to overcome the limitations of n‐type doping on (100) surfaces, is presented. This doping enhancement process can be applied to realize electronic power devices such as a junction barrier Schottky diode or junction field effect transistors with low on‐resistance...

article

Side‐bounce beamlines using single‐reflection diamond monochromators at Cornell High Energy Synchrotron Source

Stanislav Stoupin, Thomas Krawczyk, David Sagan, Alexander Temnykh, more

Journal of Synchrotron Radiation > 28 > 2 > 429 - 438

The design and implementation of new beamlines featuring side‐bounce (single‐reflection) diamond monochromators at Cornell High Energy Synchrotron Source (CHESS) are described. Undulator radiation is monochromated using an interchangeable set of diamond crystal plates reflecting radiation in the horizontal (synchrotron) plane, where each crystal plate is set to one of the low‐index Bragg reflections...

article

Toward Performance and Applications of Large Area Optical Thermometry Based on the Luminescence of Germanium‐Vacancy Defects in Diamond Nanocrystals

Caius Miller, Laurits Puust, Evgeny Ekimov, Igor Vlasov, more

physica status solidi (a) > 218 > 5 > n/a - n/a

Herein optical properties of aggregates of hydrophobic nanodiamonds (NDs) with germanium‐vacancy (GeV) defects distributed on substrates with different hydrophilicities (bare Si or TiO₂ (anatase) film on Si substrate) are investigated with an aim to achieve millimeter‐scale, nearly homogeneous spatial distribution of ND aggregates. ND aggregates are spread by drop casting of a water colloid. The...

article

Charge‐Assisted Engineering of Color Centers in Diamond

Tobias Lühmann, Jan Meijer, Sébastien Pezzagna

physica status solidi (a) > 218 > 5 > n/a - n/a

Owing to its unique optical and spin properties, the nitrogen‐vacancy (NV) center holds the promise of a diamond‐based room‐temperature scalable quantum computer, but the numerous technical and physical issues are not yet overcome, especially the poor N to NV conversion. The NV and other color centers are, however, successfully used as multitasking quantum sensors, and open new routes in quantum...

article

The chromatic number of { ${ISK}_{4}$ , diamond, bowtie}‐free graphs

Guantao Chen, Yuan Chen, Qing Cui, Xing Feng, more

Journal of Graph Theory > 96 > 4 > 554 - 577

A graph is said to be

{ISK}_{4}

‐free if it does not contain any subdivision of

K_{4}

as an induced subgraph. Lévêque, Maffray and Trotignon conjectured that every

{ISK}_{4}

‐free graph is 4‐colorable. In this paper, we show that this conjecture is true for the class of {

{ISK}_{4}

, diamond, bowtie}‐free graphs, where a diamond is the graph obtained from

K_{4}

by removing one edge and a bowtie is the graph consisting of...

article

The Relative Thermodynamic Stability of Diamond and Graphite

Mary Anne White, Samer Kahwaji, Vera L. S. Freitas, Riko Siewert, more

Angewandte Chemie > 133 > 3 > 1570 - 1573

Recent density‐functional theory (DFT) calculations raised the possibility that diamond could be degenerate with graphite at very low temperatures. Through high‐accuracy calorimetric experiments closing gaps in available data, we reinvestigate the relative thermodynamic stability of diamond and graphite. For T<400 K, graphite is always more stable than diamond at ambient pressure. At low temperatures,...

article

The Relative Thermodynamic Stability of Diamond and Graphite

Mary Anne White, Samer Kahwaji, Vera L. S. Freitas, Riko Siewert, more

Angewandte Chemie International Edition > 60 > 3 > 1546 - 1549

Recent density‐functional theory (DFT) calculations raised the possibility that diamond could be degenerate with graphite at very low temperatures. Through high‐accuracy calorimetric experiments closing gaps in available data, we reinvestigate the relative thermodynamic stability of diamond and graphite. For T<400 K, graphite is always more stable than diamond at ambient pressure. At low temperatures,...

article

Diamonds: Investigation of Room Temperature Formation of the Ultra‐Hard Nanocarbons Diamond and Lonsdaleite (Small 50/2020)

Dougal G. McCulloch, Sherman Wong, Thomas B. Shiell, Bianca Haberl, more

Small > 16 > 50 > n/a - n/a

In article number 2004695, Dougal McCulloch and co‐workers report the synthesis of nanocrystalline diamond from a compressed graphitic precursor at room temperature in a diamond anvil cell. Diamond is one of the most important materials for 21st century technology, but there is much that is still not understood about how it forms. This article shows how the presence of shear at high pressures leads...

article

Investigation of Room Temperature Formation of the Ultra‐Hard Nanocarbons Diamond and Lonsdaleite

Dougal G. McCulloch, Sherman Wong, Thomas B. Shiell, Bianca Haberl, more

Small > 16 > 50 > n/a - n/a

Diamond is an attractive material due to its extreme hardness, high thermal conductivity, quantum optical, and biomedical applications. There is still much that is not understood about how diamonds form, particularly at room temperature and without catalysts. In this work, a new route for the formation of nanocrystalline diamond and the diamond‐like phase lonsdaleite is presented. Both diamond phases...

article

Feasibility Study of TiO_x Encapsulation of Diamond Solution‐Gate Field‐Effect Transistor Metal Contacts for Miniature Biosensor Applications

Shaili Falina, Kyosuke Tanabe, Yutaro Iyama, Kaito Tadenuma, more

physica status solidi (a) > 217 > 23 > n/a - n/a

The feasibility of titanium oxide (TiO_x) encapsulation of the source/drain metal contacts of diamond solution‐gate field‐effect transistor (SGFET) for biosensor applications is explored. The SGFETs fabricated by this method show excellent FET characteristics. For comparison, the electrical characteristics performance of SGFET TiO_x encapsulated devices with two different channel lengths of 100 and...

article

Graphene–Diamond Transformation: Nano‐Thermodynamics of Chemically Induced Graphene–Diamond Transformation (Small 47/2020)

Sergey V. Erohin, Qiyuan Ruan, Pavel B. Sorokin, Boris I. Yakobson

Small > 16 > 47 > n/a - n/a

In article number 2004782, Boris I. Yakobson and co‐workers demonstrate binding of reactive gas atoms (H or F) to the exterior graphene layer, to switch its atoms from sp² to sp³ hybridization, a diamond state. The created dangling bonds connect to the next layer, and such “chemical domino effect” sweeps through to the opposite surface, forming a film with all coveted traits of diamond. Image credit:...

article

Nano‐Thermodynamics of Chemically Induced Graphene–Diamond Transformation

Sergey V. Erohin, Qiyuan Ruan, Pavel B. Sorokin, Boris I. Yakobson

Small > 16 > 47 > n/a - n/a

Nearly 2D diamond, or diamane, is coveted as an ultrathin sp³‐carbon film with unique mechanics and electro‐optics. The very thinness (≈h) makes it possible for the surface chemistry, for example, adsorbed atoms, to shift the bulk phase thermodynamics in favor of diamond, from multilayer graphene. Thermodynamic theory coupled with atomistic first principles computations predicts not only the reduction...

article

From Mantle Transition Zone with Microstructures: A New Paradigm in Ophiolite Studies

Souvik DAS

Acta Geologica Sinica ‐ English Edition > 94 > S1 > 53 - 54

The SE Ladakh (India) area displays one of the best ‐preserved ophiolite sections in this planet, in places up to 10 km thick, along the southern bank of the Indus River. Recently, in situ ultra‐high pressure (UHP) microstructural evidences from mantle transition zone (MTZ ∼ 410–660 km) with diamond and reduced fluids were discovered from two peridotite bodies in the basal mantle part of this Indus...

article

Origin of the Diamonds within Chromitite from the Mirdita Ophiolite (Albania) and its Geological Significance

Weiwei WU, Jingsui YANG, Jianping ZHENG, Dongyang LIAN, more

Acta Geologica Sinica ‐ English Edition > 94 > S1 > 64 - 65

Geophysical investigations and laboratory experiments show evidence for possible subduction of ancient oceanic crust. Geological and mineralogical observations suggest that subducted oceanic crust is recycled into the upper mantle. The subduction is supported by the recovery of super‐deep diamonds from kimberlites and the presence of crustal materials in ophiolitic chromitites and their host peridotites...

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Search results

Growth and mechanical properties of diamond films on cemented carbide with buffer layers

Thermal conductivity of a diamond magnetite composite fluid under the effect of a uniform magnetic field

First finding of microdiamond, coesite and other UHP phases in felsic granulites in the Moldanubian Zone: Implications for deep subduction and a revised geodynamic model for Variscan Orogeny in the Bohemian Massif

Typomorphic characteristics of the Ural diamonds (from FTIR spectroscopy data)

Effective thermal conductivity of disperse materials. I. Compliance of common models with experimental data

Crystal forms of natural microdiamonds

Fabrication of n‐Type Doped V‐Shaped Structures on (100) Diamond

Side‐bounce beamlines using single‐reflection diamond monochromators at Cornell High Energy Synchrotron Source

Toward Performance and Applications of Large Area Optical Thermometry Based on the Luminescence of Germanium‐Vacancy Defects in Diamond Nanocrystals

Charge‐Assisted Engineering of Color Centers in Diamond

The chromatic number of { ${ISK}_{4}$ , diamond, bowtie}‐free graphs

The Relative Thermodynamic Stability of Diamond and Graphite

The Relative Thermodynamic Stability of Diamond and Graphite

Diamonds: Investigation of Room Temperature Formation of the Ultra‐Hard Nanocarbons Diamond and Lonsdaleite (Small 50/2020)

Investigation of Room Temperature Formation of the Ultra‐Hard Nanocarbons Diamond and Lonsdaleite

Feasibility Study of TiO_x Encapsulation of Diamond Solution‐Gate Field‐Effect Transistor Metal Contacts for Miniature Biosensor Applications

Graphene–Diamond Transformation: Nano‐Thermodynamics of Chemically Induced Graphene–Diamond Transformation (Small 47/2020)

Nano‐Thermodynamics of Chemically Induced Graphene–Diamond Transformation

From Mantle Transition Zone with Microstructures: A New Paradigm in Ophiolite Studies

Origin of the Diamonds within Chromitite from the Mirdita Ophiolite (Albania) and its Geological Significance

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