Relevant bibliographies by topics / Raman thermal

Academic literature on the topic 'Raman thermal'

Author: Grafiati
Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Raman thermal"

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Kuball, M., F. Demangeot, J. Frandon, M. A. Renucci, N. Grandjean, and O. Briot. "Thermal Stability of GaN Investigated by Raman Scattering." MRS Internet Journal of Nitride Semiconductor Research 4, S1 (1999): 653–58. http://dx.doi.org/10.1557/s1092578300003203.

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We have investigated the thermal stability of GaN using Raman scattering. Noninvasive optical monitoring of the degradation of GaN during high-temperature processing has been demonstrated. GaN samples grown by molecular-beam epitaxy (MBE) and metalorganic vapor phase epitaxy (MOCVD) were studied. Characteristic features in the Raman spectrum identify three thermal stability regimes: (1) annealing below 900°C does not affect the GaN Raman spectrum; (2) annealing between 900°C and 1000°C results in the appearance of disorder-induced Raman scattering between the E2 and A1(LO) phonon; (3) annealing at temperatures higher than 1000°C gives rise to distinct Raman modes at 630 cm−1, 656 cm−1 and 770 cm−1. The evolution of the Raman spectrum of GaN with increasing annealing temperature is discussed in terms of disorder-induced Raman scattering. We find clear indications for an interfacial reaction between GaN and sapphire for annealing temperatures higher than 1000°C.
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Anaya, Julián, Carmelo Prieto, Alfredo Torres, Alonso Martín-Martín, Jorge Souto, Juan Jiménez, Andres Rodríguez, and Tomás Rodríguez. "MicroRaman Spectroscopy of Si Nanowires: Influence of Size." Materials Science Forum 725 (July 2012): 255–58. http://dx.doi.org/10.4028/www.scientific.net/msf.725.255.

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Si Nanowires (NWs) were studied by Raman microspectroscopy. The Raman spectrum of the NWs reveals important thermal effects, which broaden and shift the one phonon Raman bands. The low thermal conductivity of the NWs and the low thermal dissipation are responsible for the temperature enhancement in the NW under the excitation with the laser beam. We have modeled, using finite element methods, the interaction between the laser beam and the NWs. The Raman spectrum of Si NWs is interpreted in terms of the temperature induced by the laser beam excitation, in correlation with finite element methods (fem) for studying the interaction between the laser beam and the NWs.
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Biswas, A. "Thermal Processing of o-Terphenyl: A Raman Study." Applied Spectroscopy 47, no. 4 (April 1993): 458–62. http://dx.doi.org/10.1366/0003702934334921.

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Raman spectra from o-terphenyl sealed in glass capillary tubes were acquired over temperatures ranging from 233 K to 343 K. Over this temperature range, o-terphenyl can exist in the solid-crystalline, molten, supercooled-liquid, and amorphous-glassy states. Representative structure-sensitive spectra are presented along with a qualitative description. The lattice spectral feature occurring at a Raman shift of 123 cm−1 displays abrupt changes in profile and intensity as melting and glass transition occur. The intensity ratio of the C-C stretching 996-cm−1 line and C-H stretching line at 1008 cm−1 displays a change related to the transformation of the ordered-crystalline phase to the disordered-liquid or glassy state. At a Raman shift of 1162 cm−1 the solid-crystalline state shows a splitting due to the effect of the crystal field. The possibility of using these structure-sensitive Raman characteristics for in situ diagnostics during materials processing is discussed.
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BARR, H. C., T. J. M. BOYD, and A. V. LUKYANOV. "Raman gain against a background of non-thermal ion fluctuations in a plasma." Journal of Plasma Physics 64, no. 5 (November 2000): 623–30. http://dx.doi.org/10.1017/s0022377800008837.

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A complex stimulated Raman scattering event against a background of non-thermal ion acoustic waves in an inhomogeneous plasma is described. We obtain analytic forms for the Raman gain due to a five-wave interaction consisting of conventional three-wave Raman scattering followed by the decay of the Raman Langmuir wave into a second Langmuir wave (or a second scattered light wave) and an ion acoustic wave. Very modest levels of ion waves produce a significant effect on Raman convective gain. A combination of plasma inhomogeneity and suprathermal ion fluctuations may offer a means for the control of Raman gain.
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Kato, Ryoei, and Kun'ichi Miyazawa. "Raman Laser Polymerization ofC60Nanowhiskers." Journal of Nanotechnology 2012 (2012): 1–6. http://dx.doi.org/10.1155/2012/101243.

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Photopolymerization ofC60nanowhiskers (C60NWs) was investigated by using a Raman spectrometer in air at room temperature, since the polymerizedC60NWs are expected to exhibit a high mechanical strength and a thermal stability. ShortC60NWs with a mean length of 4.4 μm were synthesized by LLIP method (liquid-liquid interfacial precipitation method). TheAg(2) peak ofC60NWs shifted to the lower wavenumbers with increasing the laser beam energy dose, and an energy dose more than about 1520 J/mm2was found necessary to obtain the photopolymerizedC60NWs. However, excessive energy doses at high-power densities increased the sample temperature and lead to the thermal decomposition of polymerizedC60molecules.
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Som, Sanjoy M., and Bernard H. Foing. "Thermal degradation of organic material by portable laser Raman spectrometry." International Journal of Astrobiology 11, no. 3 (February 28, 2012): 177–86. http://dx.doi.org/10.1017/s1473550412000079.

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AbstractRaman spectrometry has been established as an instrument of choice for studying the structure and bond type of known molecules, and identifying the composition of unknown substances, whether geological or biological. This versatility has led to its strong consideration for planetary exploration. In the context of the ExoGeoLab and ExoHab pilot projects of ESA-ESTEC & ILEWG (International Lunar Exploration Working Group), we investigated samples of astrobiological interest using a portable Raman spectrometer lasing at 785 nm and discuss implications for planetary exploration. We find that biological samples are typically best observed at wavenumbers >1100 cm−1, but their Raman signals are often affected by fluorescence effects, which lowers their signal-to-noise ratio. Raman signals of minerals are typically found at wavenumbers <1100 cm−1, and tend to be less affected by fluorescence. While higher power and/or longer signal integration time improve Raman signals, such power settings are detrimental to biological samples due to sample thermal degradation. Care must be taken in selecting the laser wavelength, power level and integration time for unknown samples, particularly if Raman signatures of biological components are anticipated. We include in the Appendices tables of Raman signatures for astrobiologically relevant organic compounds and minerals.
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Mansour, S. F., El Sayed Yousef, M. Y. Hassaan, and A. M. Emara. "Thermal, IR, Raman characteristics, Raman gain coefficient and bandwidths in quaternary glasses." Solid State Sciences 37 (November 2014): 33–39. http://dx.doi.org/10.1016/j.solidstatesciences.2014.08.004.

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LEE, HYEON-KEUN, and DO KYUNG KIM. "DEFECT CHARACTERIZATION OF HIGH THERMAL CONDUCTIVITY CaF2 DOPED AlN CERAMICS BY RAMAN SPECTROSCOPY." Modern Physics Letters B 23, no. 31n32 (December 30, 2009): 3869–76. http://dx.doi.org/10.1142/s0217984909021934.

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Calcium fluoride additive was used to produce high thermal conductivity AlN ceramics which has no grain boundary phase. Thermal conductivity of AlN is determined by the point defect, represented as oxygen related defect, within the AlN grain. The defect density characterization of high thermal conductivity CaF 2 doped AlN ceramics after heat treatment was conducted by Raman spectroscopy. As measure Raman linewidth broadening, the point defect density variation after heat treatment and corresponding thermal conductivity change was investigated.
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Serrano, J. R., L. M. Phinney, and S. P. Kearney. "Micro-Raman thermometry of thermal flexure actuators." Journal of Micromechanics and Microengineering 16, no. 7 (April 28, 2006): 1128–34. http://dx.doi.org/10.1088/0960-1317/16/7/004.

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Bai, Zhenxu, Zhanpeng Zhang, Kun Wang, Jia Gao, Zhendong Zhang, Xuezong Yang, Yulei Wang, Zhiwei Lu, and Richard P. Mildren. "Comprehensive Thermal Analysis of Diamond in a High-Power Raman Cavity Based on FVM-FEM Coupled Method." Nanomaterials 11, no. 6 (June 15, 2021): 1572. http://dx.doi.org/10.3390/nano11061572.

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Despite their extremely high thermal conductivity and low thermal expansion coefficients, thermal effects in diamond are still observed in high-power diamond Raman lasers, which proposes a challenge to their power scaling. Here, the dynamics of temperature gradient and stress distribution in the diamond are numerically simulated under different pump conditions. With a pump radius of 100 μm and an absorption power of up to 200 W (corresponding to the output power in kilowatt level), the establishment period of thermal steady-state in a millimeter diamond is only 50 μs, with the overall thermal-induced deformation of the diamond being less than 2.5 μm. The relationship between the deformation of diamond and the stability of the Raman cavity is also studied. These results provide a method to better optimize the diamond Raman laser performance at output powers up to kilowatt-level.
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Dissertations / Theses on the topic "Raman thermal"

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Abel, Mark Richard. "Thermal Metrology of Polysilicon MEMS using Raman Spectroscopy." Thesis, Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/7181.

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The development of microscale and nanoscale devices has outpaced the development of metrology tools necessary for their complete characterization. In the area of thermal MEMS technology, accurate measurements across a broad range of temperatures with high spatial resolution are not trivial. Thermal MEMS are devices in which the control and manipulation of temperature is necessary to perform a desired function, and are used in actuation, chemical sensing, nanolithography, thermal data storage, biological reactions and power generation. In order to properly design for reliability and performance issues amongst these devices and verify modeling accuracy, the temperature distribution under device operating conditions must be experimentally determined. Raman spectroscopy provides absolute temperature measurements with spatial scales below 1 micron, which is sufficient for most MEMS devices. In this work, a detailed study of Raman spectroscopy as an optical thermal metrology tool was performed. It is shown that a calibration of the Stokes shift with temperature yields a linear calibration for measurements up to 1000?n polysilicon. These coefficients were determined for polysilicon processed under various conditions (575-620?B and P doping) to assess the effects of microstructural variations on Raman spectra. The Stokes peak was also shown to shift linearly with an applied pure bending stress. In order to make stress-independent thermometry measurements, the ratio of the Stokes to anti-Stokes signal intensities and the Stokes linewidth were calibrated over the same temperature range. Using the calibration data, Raman spectroscopy was implemented for the evaluation of temperature of thermal MEMS. Heated AFM cantilevers and micro-beam heaters were chosen due to their wide range of applications. Different thermal and mechanical boundary conditions were considered by studying both the beams and cantilevers, resulting in varying levels of thermal stress. By using the three calibrations in a complementary fashion, the validity of Raman thermometry was explored. Device temperatures of up to 650?nd their corresponding uncertainties were found, and used to verify FEA modeling. Effects of thermally induced stresses were taken into account and analyzed. Possible uncertainties such as laser heating, spatial and spectral resolution, light collection efficiency, measurement uncertainty, and instrumental drift were reported and elucidated.
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Bonner, Gerald Michael. "Thermal and spectral effects in intracavity Raman lasers." Thesis, University of Strathclyde, 2013. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=22403.

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Stimulated Raman scattering is a convenient way to extend the spectral coverage of well-established solid-state laser sources. In an intracavity Raman laser, a Raman crystal is placed inside the cavity of the fundamental laser, and the output frequency is red-shifted by an amount corresponding to a vibrational energy level of the Raman crystal. Despite the physical simplicity of these lasers, the interactions between the various optical fields are complex, and must be understood in order to realise efficient, high power operation. This thesis presents a detailed investigation of thermal and spectral effects in CW intracavity Raman lasers. A disk geometry was used to reduce the thermal lens in the laser gain crystal, thereby permitting more flexible cavity design. This facilitated experiments to probe and control the thermal and spectral effects. Diamond was assessed as a potential Raman crystal with weak thermal lensing. The optical losses in several crystals were measured and while some low loss material was identified, the supply of such material is not yet reliable. The thermal lens in a common Raman crystal, BaWO4, was measured and found to be negative and astigmatic. Using a coupled cavity configuration, experiments were performed to disentangle the effects of the thermal lenses in the laser gain and Raman crystals. This information was used to re ne the cavity design and improve the performance of the laser in a more systematic way than would otherwise have been possible. It was shown that Raman lasers using laser gain disks can provide comparable performance to rod-based systems. The first ever detailed investigation into spectral broadening in CW crystalline intracavity Raman lasers was undertaken using a combination of theory and experiment. The use of etalons to limit the broadening was investigated and it was found that these could improve the spectral brightness of the laser.
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Johnson, Aaron A. "Thermal Processing of Carbon Nanotubes." University of Cincinnati / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1399629659.

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Kwiecinski, Przemyslaw Mark. "Non contact all optical thermal conductivity measurement utilizing Raman spectroscopy." Thesis, University of Ottawa (Canada), 2006. http://hdl.handle.net/10393/27260.

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Original experimental data for the temperature dependence of the Raman shift in silicon and gallium sulfide is presented. An all optical thermal conductivity method, using an equation presented by Perichon et a1.2 and Nonnenmacher et al. 23, is applied to silicon and gallium sulfide. Theoretical calculations by Moody et al.20 and Nissam et al. 22 are compared to the experimental results of Perichon et al. for the first time. The thermal conductivity of silicon is measured at 23°C, 200°C, and 300°C, and of gallium sulfide at 23°C. We investigate the possibility of measuring thermal conductivity at high pressures.
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Malekpour, Hoda. "Optothermal Raman Studies of Thermal Properties of Graphene Based Films." Thesis, University of California, Riverside, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10252873.

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Efficient thermal management is becoming a critical issue for development of the next generation of electronics. As the size of electronic devices shrinks, the dissipated power density increases, demanding a better heat removal. The discovery of graphene’s unique electrical and thermal properties stimulated interest of electronic industry to development of graphene based technologies. In this dissertation, I report the results of my investigation of thermal properties of graphene derivatives and their applications in thermal management. The dissertation consists of three parts. In the first part, I investigated thermal conductivity of graphene laminate films deposited on thermally insulating polyethylene terephthalate substrates. Graphene laminate is made of chemically derived graphene and few layer graphene flakes packed in overlapping structure. Two types of graphene laminate were studied: as deposited and compressed. The thermal conductivity of the laminate was found to be in the range from 40 W/mK to 90 W/mK at room temperature. It was established that the average size and the alignment of graphene flakes are parameters dominating the heat conduction. In the second part of this dissertation, I investigated thermal conductivity of chemically reduced freestanding graphene oxide films. It was found that the in-plane thermal conductivity of graphene oxide can be increased significantly using chemical reduction and temperature treatment. Finally, I studied the effect of defects on thermal conductivity of suspended graphene. The knowledge of the thermal conductivity dependence on the concentration of defects can shed light on the strength of the phonon - point defect scattering in two-dimensional materials. The defects were introduced to graphene in a controllable way using the low-energy electron beam irradiation. It was determined that as the defect density increases the thermal conductivity decreases down to about 400 W/mK, and then reveal saturation type behavior. The thermal conductivity dependence on the defect density was analyzed using the Boltzmann transport equation and molecular dynamics simulations. The obtained results are important for understanding phonon transport in two-dimensional systems and for practical applications of graphene in thermal management.

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Polam, Anudeep. "Thermal and Draw Induced Crystallinity in Poly-L-Lactic Acid Fibers." Cleveland State University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=csu1439843418.

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Riedel, Gernot Jurgen. "Time Resolved Raman Thermography : Thermal Dynamics of GaN-based Electronic Devices." Thesis, University of Bristol, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.520665.

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Hartvigsen, Peter Ward. "Thermal Conductivity and Diffusivity Measurement Assessment for Nuclear Materials Raman Thermometry for Uranium Dioxide and Needle Probe for Molten Salts." BYU ScholarsArchive, 2020. https://scholarsarchive.byu.edu/etd/8622.

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In the near future, Gen II, III, and IV nuclear reactors will be in operation. UO2 is a common fuel for reactors in each of these generations and molten salts are used as coolant/fuel in Gen IV molten salt reactors. This thesis investigates potential ways to measure thermal conductivity for these materials: Raman thermometry for UO2 and a needle probe for molten salts. Four Raman thermometry techniques are investigated in this thesis: The Two Laser Raman (TLR), Time Differential Domain Raman (TDDR), Frequency Resolved Raman (FRR), and Frequency Domain Raman (FDR). The TLR is a steady state method used with a thin film. The TDDR and FRR are both time domain methods used with thin cantilever samples. The FDR is a frequency domain method used with a thermally thick sample. Monte Carlo like simulations are performed for each technique. In the simulations, the affect introduced uncertainty has on the measurement of thermal conductivity and thermal diffusivity is measured. From the results, it is recommended that the TLR should be used for measuring thermal conductivity and the FRR used for measuring thermal diffusivity. The TDDR and FDR were heavily affected by the uncertainty which resulted in inconsistent measured thermal properties. For measuring the thermal conductivity of molten salt, a needle probe was designed and manufactured to withstand the corrosive environment found in using molten salts. The probe uses modulated joule heating and measures the temperature rise in a thermocouple. The phase delay and temperature amplitude of the thermocouple are used in determining the thermal conductivity. A new thermal quadrupole based analytical solution, which takes into consideration convection and radiation, to the temperature rise of the probe is presented. The analytical solution is verified using a numerical solution found using COMSOL. Preliminary data was obtained with the probe in water.
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Sobocinski, Raymond Louis 1962. "LASER-INDUCED THERMAL DECAY OF PYRIDINE AND CHLORIDE SURFACE-ENHANCED RAMAN SCATTERING AS A PROBE OF SILVER SURFACE-ACTIVE SITES." Thesis, The University of Arizona, 1987. http://hdl.handle.net/10150/276553.

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The activation parameters for the temperature dependent irreversible loss of surface-enhanced Raman scattered (SERS) intensity from pyridine and chloride adsorbed at silver surfaces in an electrochemical environment have been determined. Laser-induced heating is introduced as a probe of the chemical nature of SERS-active sites. Surface temperatures are calculated from spectroscopic data. The activation energies associated with the destruction of SERS-active sites at a surface roughened by an illuminated oxidation-reduction cycle (ORC) are 12.8 ± 3.2 kcal/mole and 27.7 ± 3.1 kcal/mole for pyridine at two different types of sites on the Ag surface. Similarly, values for coadsorbed chloride are found to be 11.1 ± 2.4 kcal/mole and 24.5 ± 3.8 kcal/mole. An activation energy of 27.4 ± 1.9 kcal/mole is obtained for pyridine on a silver surface roughened by a nonilluminated ORC. Evidence for the desorption of pyridine and chloride is presented.
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Coillet, Élodie. "Structural characterization of thin non-crystalline layers for low thermal noise optic." Thesis, Lyon, 2017. http://www.theses.fr/2017LYSE1132/document.

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Prédites en 1916 par Albert Einstein, puis détectées 100 ans plus tard par les collaborations LIGO et VIRGO, les ondes gravitationnelles constituent un outil prometteur pour observer l’univers sur des échelles toujours plus grandes. Cependant, pour accéder à de plus nombreux évènements, une des principales limitations des détecteurs provient du bruit thermique des couches minces composant leurs miroirs, couches minces non cristallines de SiO2 et Ta2O5 dopé TiO2.L’objectif de ce travail est d’étudier l’origine microstructurale du bruit thermique de ces couches en utilisant les spectroscopies vibrationnelles pour, à terme, obtenir des matériaux plus performants. Il a notamment été observé que le bruit thermique diminue lorsque les miroirs sont recuits à faible température. Dans la silice, nous observons une restructuration du matériau lors du recuit qui semble suivre la diminution du bruit thermique. En particulier, un relâchement des contraintes a été constaté. En revanche, dans le Ta2O5, matériau de structure complexe et encore mal connue, l’effet du recuit sur la structure des couches apparaît plus limité, alors que celles-ci cristallisent facilement dès que la température augmente. Pour compléter la connaissance de ce matériau, des mesures in-situ hautes pressions ont été réalisées. Finalement, le rôle du dopage des couches de Ta2O5 par du TiO2 a été exploré
Predicted in 1916 by Einstein, then detected one hundred year later by the VIRGO and LIGO collaborations, the gravitational waves are a promising tool to observe the universe at scales always bigger. However, to detect a larger number of events, one of the main limitation of the detectors originates in the mirrors coatings thermal noise, thin non-crystalline layers composed of SiO2 and TiO2-doped Ta2O5. The aim of this work is to study the micro-structural origin of the layers thermal noise, by using vibrational spectroscopies, in order to, ultimately, process more efficient materials. Studies show a decrease of the thermal noise when the mirrors are annealed at low temperature. In silica, a structural reorganization happens during the annealing, following the evolution of the thermal noise. Notably, a stress relaxation has been observed. However, in Ta2O5, oxide with a complex structure not much studied, the impact of the annealing seems to be more limited, while the structure crystallizes easily as soon as the temperature increases. To complete our knowledge of this structure, in-situ high pressure measurements were conducted. Finally, the TiO2-doping effect of the Ta2O5 structures was studied
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Books on the topic "Raman thermal"

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Fiquet, Guillaume. Propriétés thermodynamiques de minéraux du manteau supérieur: Calorimétrie à haute température et spectroscopie Raman à haute pression et haute température. Rennes: Université de Rennes I, Centre armoricain d'étude structurale des socles, LP CNRS no 4661, 1991.

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Russell, Karen Therese. Raman spectroscopic studies of asbestos: The design and commissioning of a ramon microprobe and a study of theraman spectra of asbestos in the respirable fibre size range. Bradford, 1985.

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Book chapters on the topic "Raman thermal"

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Pezzotti, Giuseppe, and Wenliang Zhu. "Raman Spectroscopic Method for Analyzing Residual Stresses in Ceramic Composites." In Encyclopedia of Thermal Stresses, 4093–102. Dordrecht: Springer Netherlands, 2014. http://dx.doi.org/10.1007/978-94-007-2739-7_78.

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Pryor, R. W., P. K. Kuo, Lanhua Wei, and R. L. Thomas. "Thermal Wave and Raman Characterization of Diamond Films." In Review of Progress in Quantitative Nondestructive Evaluation, 1123–28. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4684-5772-8_143.

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Pryor, R. W., Lanhua Wei, P. K. Kuo, and R. L. Thomas. "Thermal Wave and Raman Measurement of Polycrystalline Diamond Film Quality." In Diamond and Diamond-like Films and Coatings, 723–28. Boston, MA: Springer US, 1991. http://dx.doi.org/10.1007/978-1-4684-5967-8_48.

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Lamanna, Grazia, Christoph Steinhausen, Andreas Preusche, and Andreas Dreizler. "Experimental Investigations of Near-critical Fluid Phenomena by the Application of Laser Diagnostic Methods." In Fluid Mechanics and Its Applications, 169–88. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-09008-0_9.

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AbstractPhysics of supercritical fluids is extremely complex and not yet fully understood. The importance of the presented investigations into the physics of supercritical fluids is twofold. First, the presented approach links the microscopic dynamics and macroscopic thermodynamics of supercritical fluids. Second, free falling droplets in a near to supercritical environment are investigated using spontaneous Raman scattering and a laser induced fluorescence/phosphorescence thermometry approach. The resulting spectroscopic data are employed to validate theoretical predictions of an improved evaporation model. Finally, laser induced thermal acoustics is used to investigate acoustic damping rates in the supercritical region of pure fluids.
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Monteil, Y., P. Raffin, P. Abraham, R. Favre, and J. Bouix. "In Situ Raman Studies of AsH3, and TMG Thermal Decomposition in GaAs MOVPE Conditions." In Mechanisms of Reactions of Organometallic Compounds with Surfaces, 169–78. Boston, MA: Springer US, 1989. http://dx.doi.org/10.1007/978-1-4899-2522-0_20.

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Hirai, Takeshi, Jeremie Compan, and Keisuke Niwase. "Micro-Raman Study on Structure Evolution of Graphite Exposed to Intense Thermal Shock Load." In Advanced Materials Research, 66–70. Stafa: Trans Tech Publications Ltd., 2008. http://dx.doi.org/10.4028/3-908454-01-8.66.

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Misra, Prabhakar, Daniel Casimir, Christina Craig, Raul Garcia-Sanchez, and Shankar Baliga. "Thermal Characterization of Single-Walled Carbon Nanotubes and Tungsten Oxide-Based Nanomaterials via Raman Spectroscopy." In Springer Proceedings in Physics, 3–8. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-29096-6_1.

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Otieno-Alego, V., D. Creagh, B. Jar, B. Fox, and A. Lowe. "Characterisation of the Moisture Absorption and Thermal Ageing Behaviour of Polymeric Composite Systems Using Raman Spectroscopy." In Ageing Studies and Lifetime Extension of Materials, 113–21. Boston, MA: Springer US, 2001. http://dx.doi.org/10.1007/978-1-4615-1215-8_11.

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Herman, Richard G., Charles E. Bogdan, and Andre J. Sommer. "Laser Raman Microprobe Study of the Identification and Thermal Transformations of Some Carbonate and Aluminosilicate Minerals." In Advances in Materials Characterization II, 113–30. Boston, MA: Springer US, 1985. http://dx.doi.org/10.1007/978-1-4615-9439-0_9.

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Palacios, P. R., Angel Bustamante, P. Romero-Gómez, and J. C. González. "Kinetic study of the thermal transformation of limonite to hematite by X-ray diffraction, μ-Raman and Mössbauer spectroscopy." In LACAME 2010, 271–76. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-4301-4_36.

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Conference papers on the topic "Raman thermal"

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Phinney, Leslie M., Wei-Yang Lu, and Justin R. Serrano. "Raman and Infrared Thermometry for Microsystems." In ASME/JSME 2011 8th Thermal Engineering Joint Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajtec2011-44097.

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This paper compares measurements made by Raman and infrared thermometry on a SOI (silicon on insulator) bent-beam thermal microactuator. Both techniques are noncontact and used to experimentally measure temperatures along the legs and on the shuttle of the thermal microactuators. Raman thermometry offers micron spatial resolution and measurement uncertainties of ±10 K; however, typical data collection times are a minute per location leading to measurement times on the order of hours for a complete temperature profile. Infrared thermometry obtains a full-field measurement so the data collection time is much shorter; however, the spatial resolution is lower and calibrating the system for quantitative measurements is challenging. By obtaining thermal profiles on the same SOI thermal microactuator, the relative strengths and weaknesses of the two techniques are assessed.
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Niccolai, F., U. Bardi, M. Muniz Miranda, and M. Giannozzi. "A Raman Study on Plasma-Sprayed Thermal Barrier Coatings During Thermal Cycling." In ITSC2003, edited by Basil R. Marple and Christian Moreau. ASM International, 2003. http://dx.doi.org/10.31399/asm.cp.itsc2003p1513.

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Abstract Yttria Partially Stabilized Zirconia (YPSZ) coatings are used as Thermal Barrier Coatings (TBCs) because of their capability to improve gas turbine performance by allowing higher turbine inlet temperature and reduced cooling air flow. Usually, YPSZ layers are applied by plasma spray on Ni-based superalloys pre-coated with a bond coat layer of MCrAlY, where M is Co, Ni, or both. In this work we used Raman spectroscopy to study the performance of TBCs during thermal cycling at two different temperature (1273K and 1373K). Raman scattering is capable of detecting monoclinic zirconia and to analyze residual stresses of the coatings with an higher sensitivity than traditional X-ray diffraction measurements. Raman spectra were analyzed by deconvolution methods in order to study the evolution of the relative intensities and position of different bands. We found that the position of the 635 cm-1 band shifts to higher values of wave number during thermal cycling and by comparing this data with those reported in literature, it is possible to retrieve the value of residual stresses in zirconia coating. We also observed a relation between the intensities of the bands at 602 cm-1 and 635 cm-1 band and the number of thermal cycles performed.
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Farmer, John, Bernhard Ersfeld, Dino Jaroszynski, Carl B. Schroeder, Wim Leemans, and Eric Esarey. "Raman Amplification in Plasma: Thermal Effects." In ADVANCED ACCELERATOR CONCEPTS: Proceedings of the Thirteenth Advanced Accelerator Concepts Workshop. AIP, 2009. http://dx.doi.org/10.1063/1.3080915.

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Presser, Volker, Marco Deluca, Christoph Berthold, Klaus G. Nickel, P. M. Champion, and L. D. Ziegler. "Sliding Wear of Silicon Carbide: Measurement of the Thermal Conductivity via Raman Spectroscopy." In XXII INTERNATIONAL CONFERENCE ON RAMAN SPECTROSCOPY. AIP, 2010. http://dx.doi.org/10.1063/1.3482347.

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WANG, TIANYU, and XINWEI WANG. "The Study of Crystalline Orientation and Interface Thermal Conductance of Mechanical Exfoliated Black Phosphorus with Raman-based Techniques." In Thermal Conductivity 33/Thermal Expansion 21. Lancaster, PA: DEStech Publications, Inc., 2019. http://dx.doi.org/10.12783/tc33-te21/30347.

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Kearney, Sean P., Leslie M. Phinney, and Michael S. Baker. "Raman Thermometry of an Electro-Thermal Microactuator." In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-79615.

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Experimentally measured temperature profiles along the micron-scale beam of a working thermal actuator are reported for the first time. Using a surface Raman scattering technique, temperature measurements are obtained in a noncontact fashion with submicron spatial resolution and to within an uncertainty of better than ±10 K. The experimental data are used to validate computational predictions of the actuator thermal performance with reasonable agreement between the data and predicted temperatures.
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Castriota, M., E. Cazzanelli, A. Fasanella, R. G. Agostino, T. Caruso, A. Policicchio, P. M. Champion, and L. D. Ziegler. "Raman Scattering Enhancement Associated to Sodium Oxide Formation after Thermal Treatment of Glass Substrates." In XXII INTERNATIONAL CONFERENCE ON RAMAN SPECTROSCOPY. AIP, 2010. http://dx.doi.org/10.1063/1.3482935.

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Beier, Hope T., Gary D. Noojin, and Benjamin A. Rockwell. "Coherent Raman scattering for localized thermal mapping." In SPIE BiOS, edited by E. Duco Jansen and Robert J. Thomas. SPIE, 2012. http://dx.doi.org/10.1117/12.913283.

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Yoshida, Kyousuke, Koichi Iwata, Hiro-o. Hamaguchi, P. M. Champion, and L. D. Ziegler. "Local Structure and Microscopic Thermal Diffusion in Ionic Liquids Studied with Picosecond Time-resolved Raman Spectroscopy." In XXII INTERNATIONAL CONFERENCE ON RAMAN SPECTROSCOPY. AIP, 2010. http://dx.doi.org/10.1063/1.3482394.

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Ghosh, Suchismita, Denis L. Nika, Evgenni P. Pokatilov, Irene Calizo, and Alexander A. Balandin. "Extraordinary Thermal Conductivity of Graphene: Prospects of Thermal Management Applications." In 2010 14th International Heat Transfer Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ihtc14-22348.

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We have recently discovered experimentally that suspended graphene, which is an individual sheet of sp2-hybridized carbon bound in two dimensions (2D), reveal an extremely high thermal conductivity. The measurements were performed using a non-contact optical technique developed by us on the basis of Raman spectroscopy. A large number of graphene flakes were suspended across trenches in Si wafers and attached to heat sinks. The flakes were heated by the focused laser light in the middle of the suspended portion of graphene. The amount of laser power dissipated in graphene and corresponding local temperature rise were determined from the integrated intensity and spectral position of graphene’s Raman G mode. The position of the G peak as a function of the sample temperature was measured independently allowing the use of micro-Raman spectrometer as a “thermometer”. The experimental thermal conductivity values were in the range of ∼ 3000–5300 W/mK near room temperature (RT) and depended on the graphene flake sizes. The thermal conductivity of graphene is the highest among all materials known to date. In this review work we will describe the details of our measurement procedure and explain theoretically why the 2D thermal conductivity of graphene is higher than that of bulk graphite provided that the size of graphene flakes is sufficiently large. Our theory, which includes the phonon-mode dependent Gruneisen parameter and phonon scattering on edges and defects, gives results, which are in excellent agreement with the experiment. Superior thermal properties of graphene are beneficial for the proposed graphene electronic devices, and may pave the way for graphene’s thermal management applications.
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Reports on the topic "Raman thermal"

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Wang, Xinwei, and David H. Hurley. In-pile Thermal Conductivity Characterization with Time Resolved Raman. Office of Scientific and Technical Information (OSTI), March 2018. http://dx.doi.org/10.2172/1427519.

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TALLANT, DAVID R., and REGINA L. SIMPSON. The Thermal History of Charred Materials by Raman Spectroscopy. Office of Scientific and Technical Information (OSTI), February 2001. http://dx.doi.org/10.2172/780284.

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Gurtowski, Luke, Joshua LeMonte, Jay Bennett, Brandon Lafferty, and Matthew Middleton. Qualification of Hanna Instruments HI9829 for the Environmental Toolkit for Expeditionary Operations. Engineer Research and Development Center (U.S.), September 2022. http://dx.doi.org/10.21079/11681/45520.

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A new, commercially available, field-portable water sensor was evaluated for efficacy during operation and compatibility with current Environmental Toolkit for Expeditionary Operations (ETEO) software. The ETEO provides sensors to Soldiers to rapidly identify and quantify environmental contamination in soil, air, and water at potential new base sites during initial reconnaissance to ensure safety and minimize unnecessary remediation efforts by the Army. In addition to streamlined environmental baseline survey (EBS) reporting, the ETEO can provide rapid analysis of potential environmental contamination to support various Military applications. The Hanna Instruments HI9829 multiparameter water meter was selected following a survey of commercial off-the-shelf (COTS) technologies and analyzed by researchers from the US Army Engineer Research and Development Center (ERDC) for inclusion in the ETEO design since it can rapidly and accurately measure 14 different properties. Usability tests were conducted with researchers unfamiliar with the technology, and a set of standard operating procedures (SOPs) were developed to operate the device. The software for the tool was successfully integrated into the ETEO system for rapid data analysis. The HI9829 has been demonstrated in various scenarios at ERDC and other locations; including Ft. Leonard Wood, MO, at which several visitors reviewed the operation of the equipment and other ETEO technologies. The Thermo Scientific Gemini, another sensor, which can detect organic constituents in various matrices via Fourier transform infrared (FTIR) spectroscopy and Raman spectroscopy was also investigated but eliminated from the ETEO design as it could not adequately detect a Military-relevant compound in an environmental matrix. Regardless, the addition of the HI9829 provides water quality monitoring to the ETEO design and greatly improves its capability to address various applications.
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