The search for novel, superhard materials

Vepřek, S.

doi:10.1116/1.581977

Cited by 1,158 publications

(301 citation statements)

References 264 publications

(314 reference statements)

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“…Light element compounds in the B-C-N-O system are the most appealing materials for novel superhard materials; inspiring extensive studies e.g. [22,655,[668][669][670].…”

Section: Superhard Materialsmentioning

confidence: 99%

High-pressure studies with x-rays using diamond anvil cells

2016

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Pressure profoundly alters all states of matter. The symbiotic development of ultrahighpressure diamond anvil cells, to compress samples to sustainable multi-megabar pressures; and synchrotron x-ray techniques, to probe materials' properties in situ, has enabled the exploration of rich high-pressure (HP) science. In this article, we first introduce the essential concept of diamond anvil cell technology, together with recent developments and its integration with other extreme environments. We then provide an overview of the latest developments in HP synchrotron techniques, their applications, and current problems, followed by a discussion of HP scientific studies using x-rays in the key multidisciplinary fields. These HP studies include: HP x-ray emission spectroscopy, which provides information on the filled electronic states of HP samples; HP x-ray Raman spectroscopy, which probes the HP chemical bonding changes of light elements; HP electronic inelastic x-ray scattering spectroscopy, which accesses high energy electronic phenomena, including electronic band structure, Fermi surface, excitons, plasmons, and their dispersions; HP resonant inelastic x-ray scattering spectroscopy, which probes shallow core excitations, multiplet structures, and spin-resolved electronic structure; HP nuclear resonant x-ray spectroscopy, which provides phonon densities of state and time-resolved Mössbauer information; HP x-ray imaging, which provides information on hierarchical structures, dynamic processes, and internal strains; HP x-ray diffraction, which determines the fundamental structures and densities of single-crystal, polycrystalline, nanocrystalline, and non-crystalline materials; and HP radial x-ray diffraction, which yields deviatoric, elastic and rheological information. Integrating these tools with hydrostatic or uniaxial pressure media, laser and resistive heating, and cryogenic cooling, has enabled investigations of the structural, vibrational, electronic, and magnetic properties of materials over a wide range of pressure-temperature conditions.

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“…Light element compounds in the B-C-N-O system are the most appealing materials for novel superhard materials; inspiring extensive studies e.g. [22,655,[668][669][670].…”

Section: Superhard Materialsmentioning

confidence: 99%

High-pressure studies with x-rays using diamond anvil cells

2016

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“…), см. [60][61][62]. Указанные упругие параметры тесно связаны с дру-гими фундаментальными физическими свойствами мате-риалов, таких как температура Дебая (θ D ) и скорость звука (ν m ).…”

Section: дв суетин ир шеинunclassified

Электронная структура, механическая и динамическая стабильность гексагональных субкарбидов M-=SUB=-2-=/SUB=-C (M = Tc, Ru, Rh, Pd, Re, Os, Ir, Pt): ab initio расчеты

Suetin¹,

Shein²

2018

Физика Твердого Тела

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Физика твердого тела, 2018, том 60, вып Посредством ab initio расчетов были изучены свойства серии гексагональных (Fe 2 N-подобных) суб-карбидов M 2 C, где M = Tc, Ru, Rh, Pd, Re, Os, Ir, Pt, и рассчитаны их равновесные структурные параметры, электронные свойства, фазовая стабильность, константы упругости, модули сжатия, сдвига и Юнга, сжимаемость, индикатор Пуга, коэффициент Пуассона, индексы упругой анизотропии, а также твердость, температура Дебая, скорости звука, низкотемпературная теплоемкость. На основании полученных данных установлено, что все эти субкарбиды механически устойчивы, однако их энергии формирования E form относительно смеси d-металла и графита положительны. Кроме того, расчет фононных спектров этих субкарбидов показал наличие отрицательных мод, что указывает на их динамическую нестабильность. Таким образом, успешный синтез данных карбидов при нормальных условиях маловероятен.

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“…Namun pembentukan lapisan TiAlN yang dikombinasikan dengan Si3N4 mampu mempertahankan kekerasan meskipun pada aplikasi suhu tinggi. Hal ini disebabkan oleh pengaturan sendiri (self-organization) struktur nano lapisan sebagai hasil dari segregasi fase secara termodinamika [7]. Selain itu lapisan TiAlN memiliki kestabilan terhadap oksidasi hingga suhu 800 0 C melalui pembentukan lapisan pasif oksida (AlTiO) [8] Senyawa nitrida keras lain adalah senyawa Si3N4 yang merupakan senyawa keramik dengan sifat mekanik, kestabilan kimia, dan konduktivitas termal yang baik khususnya pada suhu tinggi.…”

Section: Senyawa Nitridaunclassified

Potensi Pembentukan Lapisan Super Dan Ultra Keras Senyawa Komposit Nitrida Menggunakan Kaidah Elektrodeposisi

Budi

2016

SPEKTRA

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metal (Ni) is used as a matrix because good corrosion resistance properties. The composition, morphology, crystal structure, and the corrosion resistance of composite layer are affected by electrodeposition parameters such as electrodeposition current and the concentration of particles TiN and AlN. The formation of the composite layer Ni-TiAlN/Si3N4 using electrodeposition methode potentially resulting super and ultra hard nitride composite layer.

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The search for novel, superhard materials

Cited by 1,158 publications

References 264 publications

High-pressure studies with x-rays using diamond anvil cells

High-pressure studies with x-rays using diamond anvil cells

Электронная структура, механическая и динамическая стабильность гексагональных субкарбидов M-=SUB=-2-=/SUB=-C (M = Tc, Ru, Rh, Pd, Re, Os, Ir, Pt): ab initio расчеты

Potensi Pembentukan Lapisan Super Dan Ultra Keras Senyawa Komposit Nitrida Menggunakan Kaidah Elektrodeposisi

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