Effect of the Temperature Gradient on the X-ray Diffraction Spectrum of a Quartz Crystal

2017 ◽  
Vol 11 (6) ◽  
pp. 1109-1112
Author(s):  
A. R. Mkrtchyan ◽  
A. P. Potylitsyn ◽  
A. V. Vukolov ◽  
A. I. Novokshonov ◽  
A. S. Gogolev ◽  
...  
Keyword(s):  
Temperature Gradient ◽  
Quartz Crystal ◽  
Diffraction Spectrum ◽  
X Ray Diffraction ◽  
X Ray

X-ray diffraction and magnetic studies of altered ilmenite and pseudorutile

1980 ◽  
Vol 43 (329) ◽  
pp. 659-663 ◽  
Author(s):  
M. J. Wort ◽  
M. P. Jones
Keyword(s):  
Magnetic Susceptibility ◽  
Western Australia ◽  
Wide Distribution ◽  
Diffraction Spectrum ◽  
X Ray Diffraction ◽  
Magnetic Studies ◽  
Subsequent Work ◽  
Secondary Alteration ◽  
X Ray ◽  
Magnetic Spin

SynopsisIT was not until 1966 that pseudorutile was first defined. Earlier, its X-ray diffraction spectrum had been confused with that of futile and, to a lesser degree, with those of hematite and ilmenite. Subsequent work has shown that pseudorutile has a world-wide distribution in detrital ilmenite-bearing heavy mineral deposits. The present work has confirmed its magnetic susceptibility and density. In addition pseudorutile is shown to be a magnetic spin glass with a peak susceptibility at 23 °K.Altered ilmenites, in which pseudorutile occurs as a secondary alteration product, display a range of chemical composition and magnetic susceptibility. The most highly magnetic fractions are not necessarily those containing the least-altered ilmenite, and in material from Capel, Western Australia, the most highly magnetic fractions were those containing grains of ferrimagnetic ferrian ilmenite.Quantitative X-ray diffraction has shown that West Australian altered ilmenite contains significant amounts of amorphous ilmenite, pseudorutile, and rutile. The magnetic susceptibility of paramagnetic fractions of altered ilmenite from Capel, Western Australia, can be calculated from normative compositions based on chemical analyses.

scholarly journals Intercalation of solvated Na-ions into graphite

2017 ◽  
Vol 10 (7) ◽  
pp. 1631-1642 ◽  
Author(s):  
L. Seidl ◽  
N. Bucher ◽  
E. Chu ◽  
S. Hartung ◽  
S. Martens ◽  
...  
Keyword(s):  
Quartz Crystal Microbalance ◽  
Quartz Crystal ◽  
Electrochemical Quartz Crystal Microbalance ◽  
X Ray Diffraction ◽  
X Ray ◽  
Graphite Intercalation ◽  
Scanning Tunnelling ◽  
Tunnelling Microscopy ◽  
Na Ions ◽  
In Operando

The reversible intercalation of solvated Na-ions into graphite and the concomitant formation of ternary Na–graphite intercalation compounds (GICs) are studied using several in operando techniques, such as X-ray-diffraction (XRD), electrochemical scanning tunnelling microscopy (EC-STM) and the electrochemical quartz crystal microbalance technique (EQCM).

Co-Firing Behavior of Co2Z Hexagonal Ferrite/Ag Internal Electrode for MLCIs

2007 ◽  
Vol 280-283 ◽  
pp. 155-158 ◽  
Author(s):  
Chun Lin Miao ◽  
Mao Wang ◽  
Zhen Xing Yue ◽  
Ji Zhou ◽  
Xue Min Cui
Keyword(s):  
Silver Electrode ◽  
Hexagonal Ferrite ◽  
Diffraction Spectrum ◽  
X Ray Diffraction ◽  
X Ray ◽  
Remarkable Effect ◽  
Sintering Additive ◽  
Electron Image ◽  
Silver Grains ◽  
Shrinkage Behavior

This paper presents the shrinkage behavior, phase transformation and interfacial character of the hexagonal ferrite/silver electrode composite. The shrinkage analysis shows apparent sintering mismatch between hexagonal ferrite ceramic and silver electrode material and improvement of the co-fired characteristics was obtained by adding appropriate amount of sintering additive. Scanning electron microscopy observations indicate that silver grains distribute uniformly in the composite. Drawn from the back-scattered (BS) electron image, no silver dispersed into the ferrite grains and there’re no obvious chemical reactions between Co2Z hexagonal ferrite and silver, which can be confirmed by X-ray diffraction spectrum. Silver induction exerts remarkable effect on the electronic properties of the composite and could increase the dielectric constant and dielectric loss to a certain extent.

Study of an Energetic-oxidant Co-crystal: Preparation, Characterisation, and Crystallisation Mechanism

2017 ◽  
Vol 67 (5) ◽  
pp. 510 ◽  
Author(s):  
Han Gao ◽  
Wei Jiang ◽  
Jie Liu ◽  
Gazi Hao ◽  
Lei Xiao ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Differential Scanning Calorimetry ◽  
Diffraction Spectrum ◽  
Solvent Evaporation Method ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Scanning Electron

<p>An energetic co-crystal consisting of the most promising military explosive 2,4,6,8,10,12-hexanitro-2,4,6,8,10,12-hexaazaisowurtzitane (CL-20) and the most well-known oxidant applied in propellants ammonium perchlorate has been prepared with a simple solvent evaporation method. Scanning electron microscopy revealed that the morphology of co-crystal differs greatly from each component. The X-ray diffraction spectrum, FTIR, Raman spectra, and differential scanning calorimetry characterisation further prove the formation of the co-crystal. The result of determination of hygroscopic rate indicated the hygroscopicity was effectively reduced. At last, the crystallisation mechanism has been discussed.</p>

Competitive Growth of ZnO and ZnS Micro-Nano Structures

2012 ◽  
Vol 512-515 ◽  
pp. 1574-1578
Author(s):  
Wei Wei He ◽  
Jun Sang ◽  
Yang Li ◽  
Hong Xiao Zhao ◽  
Hui Min Jia
Keyword(s):  
Semiconductor Nanostructures ◽  
Diffraction Spectrum ◽  
Competitive Growth ◽  
X Ray Diffraction ◽  
Facile Hydrothermal Method ◽  
Photo Degradation ◽  
X Ray ◽  
Nano Structures ◽  
Higher Temperature ◽  
Zno Semiconductor

In this paper, a facile hydrothermal method has been developed for preparation of micro/nano structures of ZnS microspheres and ZnO microrods. The morphologies and crystalline structures were confirmed by scanning electron microscopy (SEM) and X-ray diffraction spectrum (XRD). In the co-existence of cysteine and hexamethylenetetramine (HMTA), we observed the competitive growth of ZnS and ZnO microstructures, and found that higher temperature was benefited for the formation of ZnS structures. This method may be applied for synthesis of other metal compound micro-nano structures with other metal ions. ZnS and ZnO semiconductor nanostructures as often-used photo-catalyst, we also compared their catalytical activity toward to the photo-degradation of methylene blue.

Effects of Growth Rates on Directionally Solidified Microstructure of Al-Ni-Y Ternary Alloy

2012 ◽  
Vol 562-564 ◽  
pp. 477-481
Author(s):  
Rui Xu
Keyword(s):  
Temperature Gradient ◽  
Directional Solidification ◽  
Ternary Alloy ◽  
Growth Rates ◽  
Optical Microscope ◽  
Experimental Results ◽  
Al Alloy ◽  
Directionally Solidified ◽  
X Ray Diffraction ◽  
X Ray

The directional solidification of the ternary Al alloy with composition of 2.6 at%Ni, 0.9 at%Y and 96.5 at% Al was carried out under the temperature gradient of 5 K/mm and the droping velocities of 0.5 mm/min, 1 mm/min, 5 mm/min, 10 mm/min, and 25 mm/min. The microstructure of the Al-Ni-Y ternary alloy was also analyzed by X-ray diffraction and optical microscope. The experimental results show that the microstructures of the Al-Ni-Y ternary alloy are consisted of ª-Al2, Al3Ni and Y4Ni6Al23phase when the alloy was directionally solidified in all directionally solidified rates in the experiments. No primary -Al can be found in the sample with directionally solidified rate of 0.5 mm/min. When the rates higher than 1 mm/min, the primary ª-Al can be observed. The microstructure of the directionally solidified alloy becomes finer and the primary ª-Al is smaller gradually with the increasing of growth velocities when the dropping rate of directional solidification is higher than 5 min/min. Two eutectic structures, Y4Ni6Al23andª-Al eutectic and Al3Ni and ª-Al eutectic, can be found when the dropping rate is higher than 10 mm/min.

Hydrothermal Synthesis of Mesoporous Al2O3: Influences of pH Values and Aluminum Precursors

2012 ◽  
Vol 581-582 ◽  
pp. 396-400 ◽  
Author(s):  
Hui Ping Liu
Keyword(s):  
Hydrothermal Synthesis ◽  
Aluminum Sulfate ◽  
Reaction System ◽  
Diffraction Spectrum ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ph Values ◽  
Glucose Water ◽  
Sulfate Crystal ◽  
Aluminum Precursors

The influences of pH values and aluminum precursors of “glucose-water-aluminum salt” reaction system on the hydrothermal synthesis of mesoporous Al2O3 were investigated. With the aid of scanning electron microscopy (SEM), electron diffraction spectrum (EDS) and X-ray diffraction (XRD) characterizations, we found that, under hydrothermal treatment at 180 °C for 20 h, aluminum nitrate (Al(NO3)3) could be used as the precursor to synthesize the spherical flower-like Al2O3 by using the synthesis solutions with different pH values in a certain scope; using aluminum chloride (AlCl3) as precursor, we can only get a small amount of Al2O3 composed of micro-spheres and sheets; while adopting aluminum sulfate (Al2(SO4)3) as precursor, a small amount of cubic-shape aluminum sulfate crystal can be obtained.

Study on Photocatalytic Properties of Vanadium Doped Rutile TiO2

2012 ◽  
Vol 550-553 ◽  
pp. 192-195
Author(s):  
Dao Xin Wu ◽  
Hai Xia Tong ◽  
Chang Bin Xia
Keyword(s):  
Fluorescence Spectra ◽  
Diffuse Reflection ◽  
Catalyst Concentration ◽  
Raw Material ◽  
Tetrabutyl Titanate ◽  
Diffraction Spectrum ◽  
X Ray Diffraction ◽  
X Ray ◽  
Photodegradation Efficiency ◽  
Rutile Titania

Vanadium doped rutile titania was prepared by low temperature hydrolysis using Tetrabutyl titanate as raw material. Powers were characterized by X-ray diffraction spectrum (XRD)、diffuse reflection spectra(DRS)、fluorescence spectra (FS). At 1073K, Doped concentration have been in a certain range, Vanadiumcould be doped into the lattice of rutile TiO2in the way of replacement, which would cause no change in rutile TiO2crystalline state with sunlight as the light source, pH=6.0, catalyst concentration was 1.0g.L-1, concentration of methyl orange was 5.0mg.L-1. It has been shown that Vanadium doped TiO2powders(1.0%,1073K) has been the most photodegradation efficiency, and the degradation efficiency was 97.2% after 6h.

Viscosity and Structure of KDP Aqueous Solution

2017 ◽  
Vol 898 ◽  
pp. 1776-1782
Author(s):  
Yu Lin Wu ◽  
Yi Su ◽  
Yao Liu ◽  
Yong Wang ◽  
Lei Zhang ◽  
...  
Keyword(s):  
Ionic Strength ◽  
Empirical Formula ◽  
Structural Features ◽  
Solution Viscosity ◽  
Water Molecules ◽  
Diffraction Spectrum ◽  
X Ray Diffraction ◽  
X Ray ◽  
Fitting In ◽  
Kdp Crystals

The corresponding relationship among KDP solution viscosity, concentration and temperature was researched respectively, to explore the empirical formula of the viscosity of KDP solution. The experimental results showed that the viscosity increased with the increase of ionic strength and reciprocal of temperature. Viscosity had exponent relation to ionic strength and reciprocal of temperature, fitting in well with the empirical formula: See formula in paper. The X-ray diffraction analysis showed that with the increasing amount of KDP, a new peak emerging in the diffraction spectrum accorded with molecular structure of KDP crystals, and some peaks which accorded with the structural features of water molecules gradually disappeared. It showed that with the increase of the amount of KDP, the internal structure of KDP solution had changed.

Sign in / Sign up

Export Citation Format

Share Document