X-ray data on some calcium-iron-oxygen compounds

1967 ◽  
Vol 36 (278) ◽  
pp. 280-291 ◽  
Author(s):  
H. Hughes ◽  
P. Roos ◽  
D. C. Goldring
Keyword(s):  
Light Microscopy ◽  
Ferrous Iron ◽  
Incident Light ◽  
X Ray Diffraction ◽  
X Ray ◽  
Calcium Iron ◽  
Iron Bearing

SummarySynthetic mixtures of CaO and Fe2O3 fired in air at temperatures in the range 1180° C to 1240° C in some cases lost oxygen and formed ferrous-iron-bearing compounds. Samples after firing were examined by incident light microscopy and X-ray diffraction; new powder data are presented for the phases reported. In addition to α-Fe2O3, CaFe2O4, and Ca2Fe2O53. four distinct phases have been identified. These are and two forms of , described previously by Braun and Kwestroo (1960). The likely compositions of these phases are given.

scholarly journals Properties and Analysis of Transparency Conducting AZO Films by Using DC Power and RF Power Simultaneous Magnetron Sputtering

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Neng-Fu Shih ◽  
Jin-Zhou Chen ◽  
Yeu-Long Jiang
Keyword(s):  
Incident Light ◽  
Blue Shift ◽  
Light Wavelength ◽  
Rf Power ◽  
X Ray Diffraction ◽  
X Ray ◽  
Dc Power ◽  
Incident Light Wavelength ◽  
Significant Blue Shift ◽  
Sputtering System

DC power and RF power were introduced into the magnetic controlled sputtering system simultaneously to deposit AZO films in order to get an acceptable deposition rate with high quality transparency conducting thin film. The resistivity decreases with the RF power for the as-deposited samples. The resistivity of 6 × 10−4 Ω-cm and 3.5–4.5 × 10−4 Ω-cm is obtained for the as-deposited sample, and for all annealed samples, respectively. The transmittance of the AZO films with higher substrate temperature is generally above 80% for the incident light wavelength within 400–800 nm. The transmittance of the as-deposited samples reveals a clear blue shift phenomenon. The AZO films present (002) oriented preference as can be seen from the X-ray diffraction curves. All AZO films reveal compressive stress. The annealing process improves the electrical property of AZO films. A significant blue shift phenomenon has been found, which may have a great application for electrode in solar cell.

scholarly journals Study of the High Temperature Phase of 1,16-Hexadecanediol by Polarized Light Microscopy and Glancing Incidence X-Ray Diffraction

2018 ◽  
Vol 24 (S1) ◽  
pp. 2248-2249
Author(s):  
M. Ramírez-Cardona ◽  
M.P. Falcón-León ◽  
G. Luis-Raya ◽  
G. Mejía-Hernández ◽  
R. Arceo ◽  
...  
Keyword(s):  
High Temperature ◽  
Light Microscopy ◽  
Polarized Light ◽  
High Temperature Phase ◽  
Polarized Light Microscopy ◽  
Temperature Phase ◽  
X Ray Diffraction ◽  
X Ray

Detection of Intermetallic Compounds in a Mg-5Al-3Ca-0.7Sr-0.2Mn Magnesium Alloy

2013 ◽  
Vol 197 ◽  
pp. 137-142 ◽  
Author(s):  
Tomasz Rzychoń ◽  
Janusz Szala ◽  
Tomasz Kukiełka
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Magnesium Alloy ◽  
Light Microscopy ◽  
Diffraction Analysis ◽  
Intermetallic Compounds ◽  
Intermetallic Phases ◽  
X Ray Diffraction ◽  
X Ray ◽  
Scanning Electron

In this paper the results of microstructural investigations and methodology of detection of intermetallic compounds were reported. The microstructural investigations included the light microscopy, scanning electron microscopy, chemical microanalysis and X-ray diffraction analysis. It was found that the microstructure of Mg-5Al-3Ca-0.7Sr-0.2Mn alloy consists of α-Mg, (Mg,Al)2Ca, Al3Mg13(Sr,Ca), Mg2Ca and Al2Ca intermetallic phases. The correct detection of these phases requires the high magnifications and a large number of measurements fields.

Direct observation of monoclinic ferroelectric phase and domain switching process in (K0.25Na0.75)NbO3 single crystals

CrystEngComm ◽  
2015 ◽  
Vol 17 (14) ◽  
pp. 2872-2877 ◽  
Author(s):  
Hao Deng ◽  
Haiwu Zhang ◽  
Xiangyong Zhao ◽  
Chao Chen ◽  
Xi'an Wang ◽  
...  
Keyword(s):  
Light Microscopy ◽  
Single Crystals ◽  
Direct Observation ◽  
Ferroelectric Phase ◽  
Domain Switching ◽  
Polarized Light ◽  
Switching Process ◽  
X Ray Diffraction ◽  
X Ray

The domain-switching process of monoclinic K0.25Na0.75NbO3 single crystals were studied by in situ polarized light microscopy and X-ray diffraction.

scholarly journals Genesis of langrial iron ore of hazara area, khyber pakhtunkhaw, parkistan

2021 ◽  
Vol 4 (2) ◽  
Author(s):  
Naghmah Haider ◽  
Sajjad Khan ◽  
Rehanul Haq Siddiqui ◽  
Shahid Iqbal ◽  
Nazar-Ul -Haq
Keyword(s):  
Iron Ore ◽  
High Energy ◽  
Low Grade ◽  
X Ray Diffraction ◽  
Humid Climate ◽  
X Ray ◽  
High Silica ◽  
Depositional Setting ◽  
Iron Bearing ◽  
Ore Grade

The Iron Ore of Hazara area has been studied at seven locations for detail mineralogical and genesis investigations. Thick bedded iron ore have been observed between Kawagarh Formation and Hangu Formation i.e Cretaceous-Paleocene boundary. At the base of Hangu Formation variable thickness of these lateritic beds spread throughout the Hazara and Kohat-Potwar plateau. This hematite ore exists in the form of unconformity. X-Ray Diffraction technique (XRD), X-ray Fluorescence Spectrometry (XRF), detailed petroghraphic study and Scanning Electron Microscope (SEM) techniques indicated that iron bearing minerals  are hematite,  chamosite and  quartz, albite, clinochlore, illite-montmorillonite, kaolinite, calcite, dolomite and ankerite are the impurities present in these beds. The X-ray Fluorescence (XRF) results show that the total Fe2O3 ranges from 39 to 56% and it has high silica and alumina ratio is less than one. Beneficiation requires for significant increase in ore grade. The petroghraphic study revealed the presence of ooids fragments as nuclei of other ooids with limited clastic supply which indicate high energy shallow marine depositional setting under warm and humid climate. The overall results show that Langrial Iron ore is a low-grade iron ore and can be upgraded up to 62% by applying modern mining techniques to fulfill steel requirements of the country.

scholarly journals Progress in Microanalysis

2013 ◽  
Vol 21 (3) ◽  
pp. 7-7
Author(s):  
Charles Lyman
Keyword(s):  
Light Microscopy ◽  
Spatial Resolution ◽  
Equilibrium Phase ◽  
X Ray Diffraction ◽  
Bulk Analysis ◽  
X Ray ◽  
Analysis Techniques ◽  
Composition And Structure

Many researchers view microanalysis as the determination of composition and structure of individual phases at a spatial resolution of 1 μm or better. It is remarkable to me that much of what we know about the phases shown in equilibrium phase diagrams was determined using bulk analysis techniques like powder X-ray diffraction in combination with light microscopy of flat-polished sections of materials. The identities and amounts of phases were deduced from systematic experiments because there was no way to analyze micrometer-sized phases in situ.

Removal of Arsenic from Aqueous Solution by Aeromonas hydrophila

2017 ◽  
Vol 262 ◽  
pp. 647-650
Author(s):  
Laura Castro ◽  
M. Luisa Blázquez ◽  
Felisa González ◽  
Jesús Angel Muñoz ◽  
Antonio Ballester
Keyword(s):  
Environmental Problem ◽  
Iron Concentration ◽  
Arsenic Concentration ◽  
X Ray Diffraction ◽  
Chemical Methods ◽  
X Ray ◽  
Global Environmental ◽  
Co Precipitation ◽  
Removal Of Arsenic ◽  
Iron Bearing

Arsenic contamination is considered as a global environmental problem. This metalloid is known to be carcinogenic in some forms, and is mostly found in the environment as arsenate As (V) and arsenite As (III). Several chemical methods have been established for decontamination of arsenic from ground water including biological treatments. In the present work, the effect of the anaerobic bioreduction of soluble Fe (III) by the strain Aeromonashydrophila on arsenic immobilization has been investigated. The tolerance of this strain to arsenic concentration and the effect of the iron concentration in arsenic immobilization have been studied. The release of ferrous ion indicated the bioreduction of iron and promoted the subsequent arsenic co-precipitation, leading to the formation of various iron-bearing minerals. This precipitate has been observed and identified by Scanning Electron Microscopy and X-ray diffraction analysis as Fe3(AsO4)2(H2O)8.

Sign in / Sign up

Export Citation Format

Share Document