Vibrational Absorption of Substitutional Atoms and Related Centres

Pajot, B.; Clerjaud, B.

doi:10.1007/978-3-642-18018-7_5

Cited by 3 publications

(3 citation statements)

References 170 publications

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“…Hydrostatic pressure and shear stress are created during diamond cutting, which facilitate a high-pressure phase transformation [111,112]. The high-pressure phase exhibits excellent properties of electroconductivity and machinability due to a microstructural modification [113]. During the LAC process, the high-pressure phase transformation affects the formation of lattice structure in the chip and the machined surface.…”

Section: Mechanisms Of Laser Assisted Materials Removalmentioning

confidence: 99%

Field-assisted machining of difficult-to-machine materials

Zhang,

Zheng,

Huang

et al. 2024

Int. J. Extrem. Manuf.

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Difficult-to-machine materials (DMMs) are extensively applied in critical fields such as aviation, national defense, biomedicine, and other key fields due to their excellent material properties. However, traditional machining technology is difficult to precisely machine DMMs due to poor surface quality and low processing efficiency. In recent years, as a new generation of machining technology, field-assisted machining (FAM) technology based on innovative principles such as laser heating, tool vibration, magnetic magnetization, and plasma modification provides a new solution for improving the machinability of DMMs. It is advantageous to prevent the shortcomings of traditional machining methods, and has become a hot topic of research in the domain of ultra-precision machining of DMMs. Many new methods and principles have been presented and investigated one after another, yet few researches have been analysed and summarized from a comprehensive standpoint. To fill this gap and understand the development trend of FAM, this study provides an important overview of FAM, covering different assisted machining methods, application effects, mechanism analysis, and equipment design. The current deficiencies and future challenges of FAM are summarized to lay the foundation for the further development of multi-field hybrid assisted and intelligent field-assisted machining technologies.

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Section: Mechanisms Of Laser Assisted Materials Removalmentioning

confidence: 99%

Field-assisted machining of difficult-to-machine materials

Zhang,

Zheng,

Huang

et al. 2024

Int. J. Extrem. Manuf.

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“…The extinction coefficient (K): The extinction coefficient is defined as the inertia of the electromagnetic wave inside the material, which is the amount of energy absorbed by the electrons of the material from the incident photons, and on this basis, its value is determined by the interactions of the electromagnetic wave with the medium. The extinction coefficient is calculated through the absorption coefficient values calculated from the absorbance spectrum as modified [21]:…”

Section: Reflectivity(r)mentioning

confidence: 99%

Study the Effect of Heat Treatment and Pressure on some the Optical Properties of the Pure PVA Nano Polymer

Awad

Mohammed

2021

KEM

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In this study, some optical properties were studied of the pure vinyl polyvinyl alcohol (PVA) nanopolymer (German origin). Under the influence of different temperatures and pressures of PVA. Where 25 samples were prepared for the purpose of conducting the research. Which studied the study of these samples was done by recording the absorbance and transmittance spectra of the wavelengths (200-900) nm. From them, absorbance, transmittance, reflectivity, absorption coefficient, refractive index, extinction coefficient, complex dielectric constant were calculated. At different temperatures (25,40, 80, 120, 160)°C. And with different pressures within the range (7.5,8,8.5,9,9.5) MPa. The results are that the permeability of the polymer (PVA) at different temperatures for each pressure decreases with increasing temperature, and that all other calculated optical properties increase with increasing temperature.

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“…Ion beams have been used to modify semiconductors since the 1950s [18][19][20] to control properties including electrical [21,22], optical [22][23][24][25], mechanical [21,26], thermal [27] and surface morphology [23,28]. Such methods can be similarly applied to the tailoring of these characteristics in semiconductor NWs [1,4,13,29,30].…”

Section: Introductionmentioning

confidence: 99%

Ion-beam-induced bending of semiconductor nanowires

Hanif

Camara²,

Tunes³

et al. 2018

Nanotechnology

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The miniaturisation of technology increasingly requires the development of both new structures as well as novel techniques for their manufacture and modification. Semiconductor nanowires (NWs) are a prime example of this and as such have been the subject of intense scientific research for applications ranging from microelectronics to nano-electromechanical devices. Ion irradiation has long been a key processing step for semiconductors and the natural extension of this technique to the modification of semiconductor NWs has led to the discovery of ion beam-induced deformation effects. In this work, transmission electron microscopy with in situ ion bombardment has been used to directly observe the evolution of individual silicon and germanium NWs under irradiation. Silicon NWs were irradiated with either 6 keV neon ions or xenon ions at 5, 7 or 9.5 keV with a flux of 3 × 10 ions cm s. Germanium NWs were irradiated with 30 or 70 keV xenon ions with a flux of 10 ions cm s. These new results are combined with those reported in the literature in a systematic analysis using a custom implementation of the transport of ions in matter Monte Carlo computer code to facilitate a direct comparison with experimental results taking into account the wide range of experimental conditions. Across the various studies this has revealed underlying trends and forms the basis of a critical review of the various mechanisms which have been proposed to explain the deformation of semiconductor NWs under ion irradiation.

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Vibrational Absorption of Substitutional Atoms and Related Centres

Cited by 3 publications

References 170 publications

Field-assisted machining of difficult-to-machine materials

Field-assisted machining of difficult-to-machine materials

Study the Effect of Heat Treatment and Pressure on some the Optical Properties of the Pure PVA Nano Polymer

Ion-beam-induced bending of semiconductor nanowires

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