Performance of a reflection-type polarizer by use of muscovite mica crystal in the soft x-ray region of 1keV

2005 ◽  
Vol 76 (2) ◽  
pp. 023104 ◽  
Author(s):  
Takashi Imazono ◽  
Masahiko Ishino ◽  
Masato Koike ◽  
Hiroaki Kimura ◽  
Toko Hirono ◽  
...  
Keyword(s):  
X Ray ◽  
Muscovite Mica ◽  
Mica Crystal

New Kα satellites of 30Zn following electron bombardment

1980 ◽  
Vol 58 (1) ◽  
pp. 94-97 ◽  
Author(s):  
Anand N. Nigam ◽  
Sushma Kothari
Keyword(s):  
Emission Spectrum ◽  
High Frequency ◽  
Electron Bombardment ◽  
Energy Calculations ◽  
X Ray ◽  
Muscovite Mica ◽  
Mica Crystal ◽  
First Time

The α-region of the electron excited K-X-ray emission spectrum of 30Zn, registered with the help of 20 and 40 cm curved muscovite mica crystal spectrographs of the transmission (Cauchois) type, has been microphotographically investigated.Four new high frequency satellites at 1415.2, 1411.4, 1401.7, and 1408.5 xu have been observed. On the basis of Relativistic Dirac–Fock (RDF) energy calculations for different initial and final configurations, the first three have been assigned to specific transitions (1s)−1(2p)−n → (2p)−n−1, with n = 3, 4, 5, respectively. However, the fourth one has been only tentatively assigned to the transition (1s)−1(2s)−1(2p)−4 → (2s)−1(2p)−5, since RDF calculations for these configurations were not available.The presence of two other satellites, reported earlier by Edamoto, has been confirmed. These have been observed at 1428.7 and 1424.4 xu and assigned for the first time to the transitions (1s)−1(2p)−n → (2p)−n−1 with n = 1 and 2, respectively.

X-ray imaging characteristics from a large spherically bent mica crystal (abstract)

2001 ◽  
Vol 72 (1) ◽  
pp. 1248-1248 ◽  
Author(s):  
S. G. Lee ◽  
J. G. Bak ◽  
H. G. Lee ◽  
M. Kwon ◽  
M. Bitter ◽  
...  
Keyword(s):  
X Ray ◽  
Imaging Characteristics ◽  
X Ray Imaging ◽  
Mica Crystal

Study of Mechanical Activation Processes of Mica Bearing Rocks

2014 ◽  
Vol 1040 ◽  
pp. 367-371 ◽  
Author(s):  
Valeriy M. Pogrebenkov ◽  
Kirill S. Kostikov ◽  
Yu.P. Azhel ◽  
K.S. Kamyshnaya
Keyword(s):  
Mechanical Activation ◽  
Phase Analysis ◽  
Mechanical Treatment ◽  
Time Intervals ◽  
Treatment Methods ◽  
X Ray ◽  
Study Results ◽  
Muscovite Mica

The study results of mica bearing rocks from the Mamskoye and Kuletskoye deposits and the processes, involved in grinding and activating muscovite mica from the rocks using a ball and a planetary mills, a disintegrator and a pneumoimpulsive installation depending on different time intervals and other grinding factors, are presented in this paper. The resultant materials were examined by the methods of X-ray phase analysis, derivatography, microscopy and others, which resulted in drawing the conclusions concerning the applicability of different mechanical treatment methods applied in obtaining ground mica for various uses.

Crystallization of a SiO2-MgO-Al2O3-K2O-Fe2O3-F Glass

2007 ◽  
Vol 336-338 ◽  
pp. 1829-1832 ◽  
Author(s):  
Qing Bo Tian ◽  
Yue Wang ◽  
Xue Tao Yue ◽  
Yan Sheng Yin ◽  
Su Hua Fan
Keyword(s):  
Phase Separation ◽  
Electron Probe ◽  
X Ray Diffraction ◽  
Crystalline Phases ◽  
Present Glass ◽  
X Ray ◽  
Heat Treated ◽  
Mica Crystal ◽  
Step Heat Treatment ◽  
Scanning Electron

The phase-separation and the crystallization of SiO2-MgO-Al2O3-K2O-Fe2O3-F glass were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and electron probe of microanalyzers (EPMA). The results reveal that the varieties and the morphology of crystalline phases formed depend sensitively on the thermal treatment schedules. During the isothermal treatments, the crystalline phases of mica, mica and iron oxide (FeFeO4), and FeFeO4 as major crystals are precipitated in the glass samples heat-treated at 900, 1000 and 1050°C respectively. However, the two-step heat treatment beginning at 900°C for 1h and subsequently followed at 1050°C for 1h leads to the precipitation of mica crystal and no any signs of FeFeO4 crystalline phase is observed. Also the morphology of sample is different from that of the isothermally treated glass at 1050°C, but is similar from that of sample at 900°C. A “worm”-shaped phase-separation is observed in the sample heated at 800°C for 0.5h, which exhibits different morphology from that of droplet- or globule-shape conventionally discerned. EPMA results show that the incorporation of Fe2O3 accelerates accumulation of fluorine element, promoting the phase-separation and the crystallization of the present glass.

scholarly journals Symmetry and symmetry breaking during crystal growth

2014 ◽  
Vol 70 (a1) ◽  
pp. C940-C940
Author(s):  
Elias Vlieg
Keyword(s):  
Crystal Growth ◽  
Symmetry Breaking ◽  
Chiral Symmetry ◽  
Chiral Symmetry Breaking ◽  
X Ray Diffraction ◽  
X Ray ◽  
Chiral Compounds ◽  
Isomorphous Replacement ◽  
Muscovite Mica ◽  
Left And Right

Two cases of symmetry and its breaking will be discussed in the context of crystal growth: chirality and surfaces. Chiral symmetry is a particularly interesting form of symmetry in crystal growth that may even be directly related to the homochirality that is found in Nature. About 10% of the chiral compounds crystallize as so-called racemic conglomerates, i.e. as separate crystals with only left or only right-handed molecules. The first experiments of Pasteur on a tartaric acid salt were an example of this. When crystallizing such compounds, one would expect a (symmetric) 50:50 mixture of both types of crystals, but often this is not the case. We will discuss (1) the chiral symmetry breaking in such systems [1], (2) the formation of epitaxial conglomerates that partially hide the true symmetry and (3) a phase transition from a racemic crystal (with both left- and right-handed molecules in the unit cell) to a racemic conglomerate. X-ray diffraction is often insufficient to fully characterize such systems, and solid-state NMR and computer simulations yield important additional insights. The symmetry of a bulk crystal is by definition broken at its surface, and this can manifest itself in different ways. Muscovite mica, as an example, can be made extremely flat by cleaving and therefore the bulk glide plane symmetry can be lost at the surface [2]. Charge neutrality dictates the distribution of the ions at the surface of mica and seems to be determined by local variations in the Al/Si ratio that are invisible for X-ray diffraction. By isomorphous replacement of the topmost K ions, mica can be functionalized to specifically react with other compounds.

An X-Ray Spectrometer Attachment for the Philips EM-200/EM-300 Electron Microscopes

1968 ◽  
Vol 26 ◽  
pp. 310-311
Author(s):  
R. E. Ogilvie ◽  
S. H. Moll ◽  
M. A. Schippert
Keyword(s):  
Crystal Structure ◽  
Electron Microscope ◽  
Fluorescence Analysis ◽  
Angular Range ◽  
X Ray ◽  
Mica Crystal ◽  
Electron Microscopes ◽  
Present Ability

An X-ray spectrometer has been developed to extend the analytical capability of the Philips EM-200/EM-300 Electron Microscopes to studies of sample chemistry. It attaches directly to the objective aperture port of the rotating/tilting specimen stage.Shown in Figure 1, the spectrometer is a high resolution instrument, employing a mica crystal which is continuously curved to fulfill the X-ray focusing conditions over the entire angular range. Equipped with a flow proportional counter, it is capable of analyzing characteristic X-ray lines of any element from Na through U. With the rotating/tilting specimen stage and a replacement aperture installed in the microscope, the spectrometer may be attached to or removed from the instrument in less than five minutes. It may also be left in situ during normal use of the microscope.Supplementing the present ability of the electron microscope to investigate morphology and crystal structure (by electron diffraction), the spectrometer allows the simultaneous determination of chemical composition by microprobe X-ray fluorescence analysis of areas approximately one micron in diameter.

scholarly journals Akaganeite nanorices deposited muscovite mica surfaces as sunlight active green photocatalyst

2019 ◽  
Vol 6 (3) ◽  
pp. 182212 ◽  
Author(s):  
Anoja Senthilnathan ◽  
D. M. S. N. Dissanayake ◽  
G. T. D. Chandrakumara ◽  
M. M. M. G. P. G. Mantilaka ◽  
R. M. G. Rajapakse ◽  
...  
Keyword(s):  
Self Assembly ◽  
Uv Light ◽  
Average Particle ◽  
Efficient Treatment ◽  
X Ray ◽  
Force Microscopy ◽  
Highly Active ◽  
Muscovite Mica ◽  
Assembly Technique ◽  
Particle Length

Thin films of akaganeite [FeO(OH)] nanorices deposited muscovite mica (ANPM) surfaces are synthesized using the facile urea assisted controlled self-assembly technique. The synthesized materials are characterized using scanning electron microscopy (SEM) with energy-dispersive X-ray spectroscopy, atomic force microscopy, X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy and thermogravimetric analysis (TGA). The prepared nanorices on mica surfaces show average particle length and width of 200 and 50 nm, respectively. Synthesized material acts as an efficient photocatalyst under UV and sunlight conditions as demonstrated by the degradation of standard methylene blue (MB) solution. The MB degradation efficiencies of the catalyst under exposure to 180 min sunlight and UV are 89% and 87.5%, respectively, which shows that the catalyst is more highly active under sunlight than under UV light. Therefore, the synthesized material is a potential green photocatalyst in efficient treatment of industrial dye effluents under direct sunlight.

Clays from Southern Brazil: Physical, Chemical and Mineralogical Characterization

2005 ◽  
Vol 498-499 ◽  
pp. 447-452 ◽  
Author(s):  
Sivaldo Leite Correia ◽  
K.A.S. Curto ◽  
Dachamir Hotza ◽  
Ana M. Segadães
Keyword(s):  
Raw Materials ◽  
X Ray Diffraction ◽  
Rational Analysis ◽  
Porto Alegre ◽  
Mineralogical Characterization ◽  
X Ray ◽  
Muscovite Mica ◽  
Production Stages ◽  
Ceramics Industry

Fore knowledge of the characteristics of ceramic raw materials is of utmost importance during the development, processing and production stages of any ceramic product. This work describes the characterization of clays commonly used in the ceramics industry. Two different clays were selected: clay A, from Tubarão-SC and clay B, from Porto Alegre-RS. Their chemical composition was obtained by X-ray fluorescence and their mineralogy by X-ray diffraction, coupled with numerical rational analysis. Their thermal behaviour was studied by differential thermal analysis and thermogravimetry. Their particle size distribution and plasticity were also determined. Clay A showed circa 47.5 % quartz (by weight), 40.2 % kaolinite and 9.9 % muscovite mica. Clay B showed a high kaolinite content (circa 72 wt.%), accompanied by montmorillonite (circa 10 %) and potash feldspar (circa 10 % microcline). Clay B was found to be much more plastic than clay A, and both are suitable for pottery, tiles and brick making.

Detection of the X-ray spectra of imploding neon Z-pinch with elliptically bent mica crystal spectrometer

2008 ◽  
Vol 6 (8) ◽  
pp. 622-624 ◽  
Author(s):  
施军 Jun Shi ◽  
肖沙里 Shali Xiao ◽  
王洪建 Hongjian Wang ◽  
黄显宾 Xianbin Huang ◽  
杨礼兵 Libing Yang ◽  
...  
Keyword(s):  
Crystal Spectrometer ◽  
X Ray ◽  
Mica Crystal ◽  
Z Pinch
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