Portland Cement for the Cementing of Oil Wells Developed with the Aid of the Rietveld Refinement Method

2014 ◽  
Vol 805 ◽  
pp. 350-355
Author(s):  
Danielle Nascimento Silva Oliveira ◽  
Gelmires Araújo Neves ◽  
Ulisses Targino Bezerra ◽  
Alexsandra C. Chaves ◽  
B. Silveira Lira
Keyword(s):  
Linear Programming ◽  
Portland Cement ◽  
Rietveld Refinement ◽  
Polycrystalline Materials ◽  
Oil Well ◽  
X Ray Diffraction ◽  
X Ray ◽  
Refinement Method ◽  
Low Levels

The use of the Rietveld refinement method has been highlightened as essential in the characterization of polycrystalline materials. With the aid of this method, combined with the application of the X-ray diffraction, it was possible to develop a type of cement that can temporarily substitute the Portland cement for Oil well. This cement was developed from the mixture of Portland cements commonly found in the market. The cements were passed through various sieves, then characterized by X-ray diffraction, being identified the main phases (C3A, C4AF, C3S and C2S) and quantified by the Rietveld refinement method. With the values obtained in the quantification of the phases, a new cement was made through the method of linear programming. From the results, it was possible to conclude that the developed cement presented a composition (levels of the main phases) that satisfies the requirements of NBR 9831, mainly in relation to the low levels of C3A.

Synthesis and Characterization of Ba0.3Sr0.7ZrO3 Ceramic Thick Films Prepared by Sol-Gel Technique

2012 ◽  
Vol 620 ◽  
pp. 435-439 ◽  
Author(s):  
Wan Fahmin Faiz Wan Ali ◽  
Mohamad Ariff Othman ◽  
Nik Akmar Rejab ◽  
Mohd Zaid Abdullah ◽  
Arjuna Marzuki ◽  
...  
Keyword(s):  
Thick Films ◽  
Sol Gel ◽  
Dendritic Structure ◽  
Polycrystalline Materials ◽  
X Ray Diffraction ◽  
X Ray ◽  
Gel Technique ◽  
Electrical Permittivity ◽  
Electrical Characterizations

This manuscript is explained and discussed the properties of ceramic thick films, [Ba0.3Sr0.7ZrO3,BSZ (0.7)] synthesized through sol-gel route. The gel decomposition was studied by thermogravinometry analysis (TGA). From thermal analysis, it had shown that BSZ (0.7) phase started formed at 800 °C and above. The crystal structure of this composite film studied exhibited highly polycrystalline materials by X-ray diffraction analysis. From high magnification observation of field emission scanning electron microscopy (FESEM), grain boundaries of BSZ (0.7) films are clearly defined meanwhile grains displayed are in flaky shape. The average diameters of the grains measured were 94.6 nm. However, grains boundaries of BSZ (0.0) films, are unclear and grains slightly look dendritic structure. Electrical characterizations of the films are carried out with impedance analyzer at 4 - 12 GHz respectively. Both of electrical permittivity and loss tangent observed are dependable with microstructural and structural of the films.

Structural characterization of La2−xMxCuO4 (M = Sr,Ba) samples by synchrotron x-ray and neutron powder diffraction techniques

1988 ◽  
Vol 3 (6) ◽  
pp. 1327-1335 ◽  
Author(s):  
D. E. Cox ◽  
S. C. Moss ◽  
R. L. Meng ◽  
P. H. Hor ◽  
C. W. Chu
Keyword(s):  
High Resolution ◽  
Rietveld Refinement ◽  
Powder Diffraction ◽  
Structural Characterization ◽  
Neutron Powder Diffraction ◽  
Superconducting Properties ◽  
X Ray Diffraction ◽  
Neutron Data ◽  
X Ray

High-resolution synchrotron x-ray powder diffraction studies on samples of La2−xMxCuO4 (M = Sr,Ba) prepared by standard ceramic techniques show that macroscopic compositional inhomogeneities may exist that are unlikely to be revealed by conventional x-ray diffraction methods. Rietveld refinement of neutron data collected at 200, 50, and 11 K from one such sample, nominally La1.8Sr0.2CuO4, gave satisfactory fits to a tetragonal structure of K2NiF4 type at all three temperatures. However, careful individual peak fits revealed that part of the sample transforms to orthorhombic between 200 and 50 K. It is suggested that this multiphase character has an important influence on the superconducting properties.

Characterization of Cordierite Glass with the Addition Colorant Ceramic Glaze for FIR Therapy

2016 ◽  
Vol 840 ◽  
pp. 207-212
Author(s):  
Lim Yi Xuan ◽  
Johar Banjuraizah ◽  
Zainal Arifin Ahmad
Keyword(s):  
High Hardness ◽  
Structural Refinement ◽  
X Ray Diffraction ◽  
Porosity Level ◽  
X Ray ◽  
Refinement Method ◽  
Cordierite Glass ◽  
Crystallization Of Glass ◽  
Rietveld Structural Refinement

α-Cordierite glass ceramic was synthesised through crystallization of glass compacts made of milled glass frits. The effect of temperatures and colorants were studied. The crystal structure of α-cordierite was analysed using X-ray diffraction technique and Rietveld structural refinement method. Density, porosity and shrinkage analysis, Vickers hardness and SEM were also performed. The result revealed that at higher sintering temperatures, the properties of α-cordierite was getting better. Low apparent porosity level and high hardness dense α-cordierite was fabricated at temperature 1350oC. The low porosity level may lead to high thermal conductivity which suggested that cordierite was candidates for FIR therapy instrumemts.________________________________________________________________________

Characterization of Cement-Rice Husk Ash Composites

2017 ◽  
Vol 866 ◽  
pp. 187-190
Author(s):  
Thossapon Jaihlong ◽  
Nittaya Jaitanong ◽  
Suparut Narksitipan
Keyword(s):  
Portland Cement ◽  
Rice Husk ◽  
Fiber Optic ◽  
Rice Husk Ash ◽  
Cementitious Materials ◽  
Cement Composites ◽  
X Ray Diffraction ◽  
X Ray ◽  
Lime Water

In present research, the cement-rice husk ash composites were prepared and characterized. The samples were added fiber optic and rice husk ash was used as replacement cementitious materials at 10, 20, 30 and 40 wt% of portland cement. The samples were demolded after 24 h casting and cured in saturated lime water for 3 days. After these periods, the samples were wrapped with plastics films for 7 and 28 days. Then, samples were dried in air for 24 h. The chemical compositin of portland cement and rice husk ash were characterized by using x-ray fluorence spectrometry (XRF). Additionally, dried samples were analysized phase compositions and crystalline structure by using x-ray diffraction (XRD) technique. The chemical element compositions and microstructure were detected by scanning electron microscopy (SEM), respectively. Moreover, The effect of rice husk ash in these cement composites were investigated in this research.

scholarly journals Synthesis and Characterization of Phosphate Doped BaPr1-y(Y/Yb/Tm)yO3-δ

2020 ◽  
Author(s):  
Phil Keenan ◽  
Alaric smith ◽  
Peter Slater
Keyword(s):  
Raman Spectroscopy ◽  
Synthesis And Characterization ◽  
Conductivity Measurements ◽  
Conductivity Data ◽  
X Ray Diffraction ◽  
X Ray ◽  
Co Doping ◽  
Low Levels

<p>In this paper we examine the effects of doping phosphate into yttrium, ytterbium, and thulium doped BaPrO<sub>3</sub>. Through phosphate doping it is possible to achieve high levels of Y/Yb/Tm, and we show that it is possible to completely replace all the Pr with this co-doping strategy, albeit such phases contained small impurities. The samples were analysed through a combination of X-ray diffraction, TGA, Raman spectroscopy and conductivity measurements. Conductivity data indicated that these heavily Y/Yb/Tm doped samples, however, showed lower conductivities than reported for previously for low levels (10-20%) of Y/Yb doping. </p>

Microstructural Characterization of Slag Residue Incorporated into Clay for Production of Red Ceramics

2020 ◽  
Vol 1012 ◽  
pp. 239-243
Author(s):  
Clara Giovana Souza Silva ◽  
Geyna Evellyn Silva de Jesus ◽  
Jheison Lopes dos Santos ◽  
Sergio Neves Monteiro ◽  
Roberta Lima de Souza Costa ◽  
...  
Keyword(s):  
Steel Slag ◽  
Microstructural Characterization ◽  
Mechanical Resistance ◽  
Steel Mill ◽  
X Ray Diffraction ◽  
X Ray ◽  
Processing Step ◽  
Low Levels ◽  
Red Ceramics

This study aims to characterize slag and from a steel mill and clays from in the state of Pará, aiming at its incorporation into clays for tiles production. The waste passed through the processing step X-ray diffraction (XRD) and X-ray fluorescence (XRF) were performed. Besides that, strong and weak clays from state of Pará were also analyzed by thermogravimetric analysis (TGA), scanning electron microscopy (SEM) and XRD. The results showed that hematite, magnetite and wustite are the predominant phases. The chemical analysis by XRF showed that the residue presents low levels of silica (SiO2) and alumina (Al2O3) associated with elevated levels of iron oxide. Thus, the characterization of steel slag showed that this residue presents itself as a potential ceramic constituent and can contribute to the formation of liquid phase during which it would lead to improvement of technological properties such as water absorption and mechanical resistance.

Three Dimensional Characterization of Grain Structures by EBSP and 3DXRD

2007 ◽  
Vol 558-559 ◽  
pp. 751-756 ◽  
Author(s):  
Kristofer Hannesson ◽  
Dorte Juul Jensen
Keyword(s):  
Three Dimensional ◽  
Polycrystalline Materials ◽  
Serial Sectioning ◽  
X Ray Diffraction ◽  
X Ray ◽  
3D Structures ◽  
3 Dimensional ◽  
Grain Structures ◽  
Non Destructive

Grain structures in polycrystalline materials are typically three dimensional (3D) structures, but by far the most characterizations of grain structures are done by microscopy and are thus limited to 2D. In the present work 3D grain structures in a well-annealed cylindrical aluminium (AA1050) sample is characterized and analyzed. The characterization is done by 2 methods i) by non-destructive 3-dimensional x-ray diffraction (3DXRD) ii) by serial sectioning and subsequent EBSP mapping of entire circular 2D sample sections; 50 sections are mapped In total 333 grains are reconstructed. It is found that the 3D grain morphologies can be quite complex in particular for the larger grains, the number of neighbours varies significantly and values above 20 are not unusual. When the results from the 2 methods are compared, it is found that the crystallographic agreement is very good and within experimental uncertainties. Slightly more significant differences are found when the reconstructed grain morphologies are compared. Reasons for this are discussed.

Sign in / Sign up

Export Citation Format

Share Document