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Academic literature on the topic 'Quartz crystals Defects'

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

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Journal articles on the topic "Quartz crystals Defects"

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Zhang, Xiao Jie. "Research on Synthetic Quartz Crystal Quality." Advanced Materials Research 716 (July 2013): 397–401. http://dx.doi.org/10.4028/www.scientific.net/amr.716.397.

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The quality of two synthetic quartz crystals, Z lump and Y bar, was researched by the infrared spectrophotometer technology and chemical spectral analysis in this study. The relationships between typical impurity OH and other impurities such as Fe, CO and Mg were discussed which impacted the quality of artificial rock crystal; the defects in artificial rock crystal and crystals, such as lattice dislocation and distortion with a close relation appear at the same time and impact the quality of synthetic quartz. The work in future should begin from the following two aspects in order to improve synthetic quartz crystal quality: the one is to further study the crystal structure characteristics and to explore the cutting type of crystal with convenient cultivation and processing process, high use ratio and high Q value. For example, the research is to make the Z area of Y bar crystals bigger and the other areas smaller or disappear. The other one is to improve the existing technological level and to reduce defects.
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Hyde, B., and A. Mclaren. "The Crystal Chemistry of Moganite and Amethyst." Australian Journal of Chemistry 49, no. 8 (1996): 861. http://dx.doi.org/10.1071/ch9960861.

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The crystal structure of moganite , SiO2, is described, analysed, and shown to be (mimetic) Brazil-twinned α-quartz: it consists of {1101} layers of the latter, one tetrahedron thick, coherently joined at composition planes, with left- and right-handed quartz layers alternating. The structure of the region immediately adjacent to a composition plane is identical to that found in macroscopically twinned quartz, e.g. in amethyst. Thus the 'defect' structure in the latter is the total structure of the former-a classic example of Wadsley's idea that, in crystals, 'defects' are stable structural entities.
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Bahadur, Harish. "Hydroxyl defects in Ge-doped cultured quartz crystals." Infrared Physics & Technology 36, no. 3 (April 1995): 685–90. http://dx.doi.org/10.1016/1350-4495(94)00095-3.

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van Horn, J. David, Fei Wu, Gerald Corsiglia, and Yan Ching Jean. "Asymmetric Positron Interactions with Chiral Quartz Crystals?" Defect and Diffusion Forum 373 (March 2017): 221–26. http://dx.doi.org/10.4028/www.scientific.net/ddf.373.221.

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We have studied the interaction of the positron with chiral left-or right-handed quartz crystals. In Doppler-broadening experiments, using a mono-energetic positron beam there is a differential depth profile for positrons implanted in LH or RH z-cut quartz as identified by a shape parameter (S). Further, in bulk positron annihilation lifetime spectroscopy (PALS) experiments, the lifetime (τ 2) attributed to free annihilation of the positron interacting with the chiral lattice exhibits a larger value for the LH quartz, and the associated intensity (I2) is also significantly different—RH quartz is consistently 10% greater than the LH crystal. The τ3 lifetime and its intensity, I3, attributed to positronium interacting with defects in the quartz, also appears to exhibit differences between the enantiomeric sets of crystals. These observations may demonstrate chiral recognition using a positron annihilation technique, pave the way for a broad range of positron experiments, and may help inform hypotheses of chirality recognition, selection, or induction by beta radiation.
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Boboyarova, Sh T., Sh A. Vakhidov, Zh D. Ibragimov, R. T. Turdiev, and O. B. Khushvakov. "The effect of structural defects in quartz crystals on radiation defect formation." Atomic Energy 87, no. 2 (August 1999): 607–10. http://dx.doi.org/10.1007/bf02673227.

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Bahadur, Harish. "Hydroxyl defects and electrodiffusion (sweeping) in natural quartz crystals." Journal of Applied Physics 73, no. 11 (June 1993): 7790–97. http://dx.doi.org/10.1063/1.353952.

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Nanev, N., and M. Wilkens. "Defects in quartz crystals initiated during their hydrothermal growth." Crystal Research and Technology 25, no. 5 (May 1990): 531–40. http://dx.doi.org/10.1002/crat.2170250515.

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Klemme, Stephan, Jasper Berndt, Constantinos Mavrogonatos, Stamatis Flemetakis, Ioannis Baziotis, Panagiotis Voudouris, and Stamatios Xydous. "On the Color and Genesis of Prase (Green Quartz) and Amethyst from the Island of Serifos, Cyclades, Greece." Minerals 8, no. 11 (October 26, 2018): 487. http://dx.doi.org/10.3390/min8110487.

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The color of quartz and other minerals can be either caused by defects in the crystal structure or by finely dispersed inclusions of other minerals within the crystals. In order to investigate the mineral chemistry and genesis of the famous prase (green quartz) and amethyst association from Serifos Island, Greece, we used electron microprobe analyses and oxygen isotope measurements of quartz. We show that the color of these green quartz crystals is caused by small and acicular amphibole inclusions. Our data also shows that there are two generations of amphibole inclusions within the green quartz crystals, which indicate that the fluid, from which both amphiboles and quartz have crystallized, must have had a change in its chemical composition during the crystallization process. The electron microprobe data also suggests that traces of iron may be responsible for the amethyst coloration. Both quartz varieties are characterized by isotopic compositions that suggest mixing of magmatic and meteoric/marine fluids. The contribution of meteoric fluid is more significant in the final stages and reflects amethyst precipitation under more oxidizing conditions.
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Barbee, Olivia, Craig Chesner, and Chad Deering. "Quartz crystals in Toba rhyolites show textures symptomatic of rapid crystallization." American Mineralogist 105, no. 2 (February 1, 2020): 194–226. http://dx.doi.org/10.2138/am-2020-6947.

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Abstract Textural and chemical heterogeneities in igneous quartz crystals preserve unique records of silicic magma evolution, yet their origins and applications are controversial. To improve our understanding of quartz textures and their formation, we examine those in crystal-laden rhyolites produced by the 74 ka Toba supereruption (>2800 km3) and its post-caldera extrusions. Quartz crystals in these deposits can reach unusually large sizes (10–20 mm) and are rife with imperfections and disequilibrium features, including embayments, melt inclusions, titanomagnetite and apatite inclusions, spongy morphologies, hollow faces, subgrain boundaries, multiple growth centers, and Ti-enriched arborescent zoning. Using a combination of qualitative and quantitative analyses (petrography, CL, EBSD, X-ray CT, LA-ICPMS), we determine that those textures commonly thought to signify crystal resorption, crystal deformation, synneusis, or fluctuating P–T conditions are here a consequence of rapid disequilibrium crystal growth. Most importantly, we discover that an overarching process of disequilibrium crystallization is manifested among these crystal features. We propose a model whereby early skeletal to dendritic quartz growth creates a causal sequence of textures derived from lattice mistakes that then proliferate during subsequent stages of slower polyhedral growth. In a reversed sequence, the same structural instabilities and defects form when slow polyhedral growth transitions late to fast skeletal-dendritic growth. Such morphological transitions result in texture interdependencies that become recorded in the textural-chemical stratigraphy of quartz, which may be unique to each crystal. Similar findings in petrologic experimental studies allow us to trace the textural network back to strong degrees of undercooling and supersaturation in the host melt, conditions likely introduced by dynamic magmatic processes acting on short geologic timescales. Because the textural network can manifest in single crystals, the overall morphology and chemistry of erupted quartz can reflect not only its last but its earliest growth behavior in the melt. Thus, our findings imply that thermodynamic disequilibrium crystallization can account for primary textural and chemical heterogeneities preserved in igneous quartz and may impact the application of quartz as a petrologic tool.
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Kristianpoller, N. "Defects induced in synthetic quartz crystals by vacuum-ultra-violet radiation." Physica Scripta 36, no. 1 (July 1, 1987): 179–83. http://dx.doi.org/10.1088/0031-8949/36/1/030.

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Dissertations / Theses on the topic "Quartz crystals Defects"

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Hutton, Keith Beveridge. "Characterisation of imperfections in single crystals of high purity synthetic quartz." Thesis, University of Strathclyde, 1990. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=21289.

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The work described in this thesis is a study of imperfections in high purity, low dislocation content synthetic quartz single crystals which are grown on a commercial scale by the General Electric Company. Hydrogen and metal ion impurities in quartz were studied using low temperature transmission Fourier Transform Infrared Spectroscopy, (FTIR). Incorporation of impurities in quartz was investigated using crystals which were doped with Al, Fe, Cr, Co, Ti, P, Cu and K. Orientation of hydroxyl impurities was determined using polarised infrared spectroscopy. Deuterated quartz crystals were grown and studied as analogues to high purity crystals. X-ray diffraction topography was used to evaluate crystal quality and to perform a study of quartz which had been treated by electrodiffusion, or sweeping. Crystal lattice strain and sweeping damage was studied using double crystal topography at the Synchrotron Radiation Source, (SRS), at the Daresbury Laboratory. Metal ion impurities were sh own to incorporate interstitially into quartz crystals. The only exceptions were aluminium and iron, which incorporated substitutionally. All the impurities studied introduced hydrogen impurities such as hydroxyl ions and water molecules into quartz. A relationship between impurity concentration and hydrogen content was clearly indicated. The 3200 cm-1 broad absorption band characteristic of impure and fast grown synthetic quartz was strongly implicated as being due to interstitially incorporated water molecules. The major hydrogen impurities in quartz were sodium hydroxide molecules which were preferentially aligned along the X, Y and Z growth axes. Hydroxyl ions were not incorporated directly from the growth solution. Sweeping was shown to induce the formation of a negative space charge in treated quartz which gave rise to inhomogeneous lattice strain. The strain was gradually relieved upon prolonged exposure to x-rays. A mechanism for the production and relief of lattice strain has been proposed. Sweeping produced surface damage on mechanically polished crystals but not on those treated by chemical polishing using hydrofluoric acid. No further detrimental effects of sweeping were observed. Double crystal topographic studies revealed two possible bulk defects in Quartz. The first of these was a previously unreported planar defect parallel to the X-Y plane of quartz. The second was possibly a planar defect associated with the cellular growth cells in the (00.1) growth sector of quartz. The validity of these observations was put in doubt by the possibility of defect projection from the silicon monochromator which had been used in double crystal studies.
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Sá, Leandro de. "Etude des propriétés des systèmes désordonnés à basses températures : mesures de chaleur spécifique dans des quartz irradiés aux neutrons." Grenoble 1, 1987. http://www.theses.fr/1987GRE10095.

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Conference papers on the topic "Quartz crystals Defects"

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Liu, Fuqing, Chunyan Yao, and Wei Peng. "Key Factors in Ultraviolet-Curing Wire Saw." In 2007 First International Conference on Integration and Commercialization of Micro and Nanosystems. ASMEDC, 2007. http://dx.doi.org/10.1115/mnc2007-21170.

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Wire saw, with its ability to cut hard brittle material, such as silicon ingots, crystals and quartz, has emerged as a leading technology for production in semiconductor and photovoltaic industry. There are some defects in conventional loose abrasive wire saw such as significant industrial waste, low machining efficiency, high running costs, etc. As a countermeasure to these problems, some fixed-abrasive diamond wire saws are produced by electroplating process, bonding with resin agent or mechanical embedding of abrasive grains into piano wires. Nevertheless, there still exist disadvantages such as low efficiency of bonding process and high manufacture cost. For this reason, in the research, an idea of making fixed-abrasive diamond wire saw bonded with ultraviolet-curing resin is proposed. In manufacture process, generally, the preparation of materials, improvement of adhesion, and the art of ultraviolet curing determine what technologies is most effective. Therefore, to attain a specific set of properties in the cured wire saw and to achieve an efficient ultraviolet-curing process, the factors that influence the photopolymerization should be well understood. In this paper, the manufacturing process of an ultraviolet-curing resin wire saw is illustrated. Moreover, slicing experiments are deduced to evaluate the results of the study.
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Sheehan, Jessica. "Single Crystal Quartz a Replacement for Diamond Optical Windows." In ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-66327.

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Diamond windows are used extensively in the field of optics due to their high transmittance and durability. However, despite their ability to withstand high pressures, diamond windows are not scratch resistant and need to be replaced when the surface is damaged. Moreover, the high cost of diamond windows necessitates extra care to protect the windows and limits the practical size of the window or lens. Thus, alternatives to the highly expensive diamond windows are needed in the optical sciences. A study of single crystal quartz has been conducted to determine if it will make a suitable replacement material. Since the transmittance of single crystal quartz is well documented and desirable for this application, only strength and surface defect experiments were conducted. Trials were run to determine the modulus of rupture of single crystal quartz samples which were also examined with an interferometer and an atomic force microscope (AFM) to correlate the surface conditions with the modulus of rupture. The results showed that even relatively numerous and large defects on the surface did resulted in single crystal quartz holding to high pressures. In addition, the measured modulus of rupture far exceeded the expected values proving that the single crystal quartz is able to withstand the pressures of vacuum. Single crystal quartz is thus found to be a viable alternative to diamond optical windows.
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Chen, Zhebo, Xin Zhang, and Dandan Huang. "Defect inspection of quartz crystal based on machine vision." In International Conference on Optical Instruments and Technology (OIT2013), edited by Xinggang Lin and Jesse Zheng. SPIE, 2013. http://dx.doi.org/10.1117/12.2038090.

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Ihinger, Phillip, and Stephen I. Zink. "Control of defect concentrations in single crystals: insights from micro-IR on natural quartz crystals." In International Symposium on Optical Science and Technology, edited by Alexander J. Marker III and Mark J. Davis. SPIE, 2001. http://dx.doi.org/10.1117/12.446888.

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Bow, Sing T., Ting Chen, and Darrell E. Newell. "Detection And Identification Of Visually Indiscernible Defects From Textural Background Of An Unpolished Quartz Crystal." In 1989 Symposium on Visual Communications, Image Processing, and Intelligent Robotics Systems, edited by Michael J. W. Chen. SPIE, 1990. http://dx.doi.org/10.1117/12.969950.

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