Influence of Different Sintering System on the Formation of Tricalcium Aluminate

2010 ◽  
Vol 150-151 ◽  
pp. 741-744
Author(s):  
Jun Xiao ◽  
Bao Guo Ma ◽  
Hong Bo Tan
Keyword(s):  
Phase Equilibria ◽  
Microwave Heating ◽  
Powder Diffraction ◽  
Experimental Results ◽  
Electrical Heating ◽  
Al2o3 Powder ◽  
X Ray ◽  
Tricalcium Aluminate

Several different sintering systems about the formation of C3A ,by mixing CaO and Al2O3 powder, are studied in this experiment. The sample is characterized by glycerol ethanol method, X-ray powder diffraction and TG-DTA. The experimental results show that: reducing the react time cannot boost the formation of C3A, but traditionally electrical heating combined microwave heating can romote the formation of C3A rapidly .In terms of phase equilibria of CaO-Al2O3 system, pure C3A cann’t be synthesized by sintering . Except the samples also contain minor amounts of CA and C12A7.

Effect of Pair-Mineralizer on the Reaction of Alite and Calcium Langbeinite Formation

2006 ◽  
Vol 510-511 ◽  
pp. 622-625
Author(s):  
Woo Teck Kwon ◽  
Young Phil Kim ◽  
Y. Kim ◽  
Soo Ryong Kim ◽  
Seong Youl Bae
Keyword(s):  
Powder Diffraction ◽  
Calcium Silicate ◽  
Mineralogical Composition ◽  
Experimental Results ◽  
Silicate Minerals ◽  
X Ray

This paper investigates the effect of the pair-minerializer (CaSO4,-CaF2) on the reaction of alite, belite and calcium langbeinite formation with different alkali and sulfate contents. A set of clinker samples was prepared by adding laboratory grade reagents of (NH4)2SO4, CaF2 and K2CO3 to the cement raw mixes. The mineralogical composition of clinker was analyzed by X-ray powder diffraction, and the quantity of minerals was evaluated by using TOPAS software. As the experimental results, the total amount of calcium silicate minerals was rapidly increased with the addition of F and SO3 components simultaneously as pair-mineralizer with K2O more than the value which mineralizer was added separately. Also, in the case of adding K2O only to the raw mixes, the amount of alite is decreased after clinkering. However, if alkali (K2O) and pair-minerializer (CaSO4,-CaF2) were added simultaneously, the quantity of alite and calcium langbeinite mineral increased because of the formation of stable clinker minerals by the reaction of alkali (K2O) and sulfate.

High Conducting Heterovalent Substituted NASICON-like Phases in ScPO4-Na3PO4Quasibinary System

2008 ◽  
Vol 1100 ◽  
Author(s):  
Anna Potapova ◽  
Mariya Zhuravleva ◽  
Irina Smirnova ◽  
Felix Spiridonov ◽  
Galina Zimina ◽  
...  
Keyword(s):  
Ionic Conductivity ◽  
Impedance Spectroscopy ◽  
Phase Equilibria ◽  
Powder Diffraction ◽  
Solid Solutions ◽  
X Ray ◽  
Quasibinary System ◽  
Complex Phosphate

AbstractPhase equilibria in quasibinary system ScPO4-Na3PO4 and formation of heterovalent Zr-substituted solid solutions (up to 10 mol%) for Sc3+ in Na3Sc2(PO4)3 complex phosphate were studied by ceramic technique at 1050°C. Obtained samples were investigated with X-ray powder diffraction and impedance spectroscopy. Zr-substituted (10 mol%) Na3Sc2(PO4)3has ionic conductivity of 3.18.10-1 S/cm at 300°C.

scholarly journals Study of the phase equilibria in the L-alanine - sodium nitrate system by optical microscopy and X-ray powder diffraction

2015 ◽  
Vol 21 (S3) ◽  
pp. 1805-1806
Author(s):  
Denniz Marquez-Ruiz ◽  
Javier Hernandez-Paredes ◽  
Gemma Moreno-Corella ◽  
Esparza-Ponce ◽  
Ofelia Hernandez-Negrete ◽  
...  
Keyword(s):  
Phase Equilibria ◽  
Optical Microscopy ◽  
Powder Diffraction ◽  
Sodium Nitrate ◽  
X Ray ◽  
Nitrate System

X-Ray Characterization of Phase Equilibria of the Raveau and 2212 Phases in the Bi-Sr-Ca-Cu-0 System

1995 ◽  
Vol 39 ◽  
pp. 731-738
Author(s):  
Winnie Wong-Ng ◽  
Lawrence P. Cook ◽  
F. Jiang
Keyword(s):  
Solid Solution ◽  
Phase Equilibria ◽  
Powder Diffraction ◽  
Primary Crystallization ◽  
Primary Crystallization Field ◽  
X Ray ◽  
Solid Solution Region ◽  
Ca Substitution ◽  
Solution Region

Phase equilibria of two superconductor phases, namely the 20K Raveau phase (Bi2.2-xSr1.8+xCuOz, currently referred to as the 11905 phase) and the 80K 2212 phase of the Bi-Sr-Ca-Cu-0 system were investigated. The amount of Ca-substitution of the Raveau solid solution was determined and the solid solution region can be approximately described as Bi2.2+xSr1.8-X-Y CayCu1±x/2Ow (referred to as the Ca-Raveau phase or the 119x5, ‘ with 0<x<0.15, 0<y<0.5. To determine the melting equilibria of the 2212 phase, a procedure involving the use of a wicking technique to capture the melt was applied. X-ray powder diffraction (XPD) and quantitative energy dispersive x-ray spectroscopy (EDS) were used to analyse the phases present in the residual and melt, respectively. The approximate primary crystallization field of the incongruently melting 2212 phase was illustrated.

Phase Equilibria in Copper(I) Bromide-MBr Systems (M = Li, Na, K)

2007 ◽  
Vol 62 (9) ◽  
pp. 507-512 ◽  
Author(s):  
Alina Wojakowska ◽  
Edward Krzyżaka ◽  
Andrzej Wojakowski ◽  
Marek Wołcyrz
Keyword(s):  
Phase Equilibria ◽  
Powder Diffraction ◽  
Solid Solutions ◽  
Solid Solubility ◽  
Room Temperature ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Mutual Solid Solubility

The phase equilibria of CuBr-LiBr, CuBr-NaBr and CuBr-KBr were studied by difference scanning calorimetry (DSC) and X-ray powder diffraction. Extended solid solutions have been found in CuBr-LiBr, while mutual solid solubility of the components of CuBr-NaBr and CuBr-KBr seems to be negligible. It has been confirmed that K2CuBr3 is stable at room temperature.

scholarly journals PHASE EQUILIBRIA OF THE PbBi2Te4–"PbSb2Te4" SECTION OF THE PbTe–Bi2Te3–Sb2Te3 SYSTEM AND SOME PROPERTIES OF THE SOLID SOLUTIONS

2020 ◽  
pp. 53-59
Author(s):  
A.I. Aghazade ◽  
Keyword(s):  
Solid Solution ◽  
Phase Equilibrium ◽  
Phase Equilibria ◽  
Solid Solutions ◽  
Solid Phase ◽  
Equilibrium Diagram ◽  
Experimental Results ◽  
X Ray Diffraction ◽  
X Ray ◽  
Solid Phase Equilibrium

PbTe–Bi2Te3–Sb2Te3 system has been studied by DTA and X-ray diffraction methods along the PbBi2Te4 – "PbSb2Te4" section. It was found that the compound of the composition PbSb2Te4, specified in the literature does not exist. On the basis of the latter a wide (more than 50 mol%) area of solid solution (γ) was detected. By using obtained experimental results, a fragment of the solid-phase equilibrium diagram of the PbTe–Bi2Te3–Sb2Te3 system was constructed and boundaries of the heterogeneous areas α+γ, α+β, α+β+γ (α- and β- are solid solutions based on PbTe and Sb2Te3, respectively) have been determined

X-Ray Powder Diffraction Study of NBS Fly Ash Standard Reference Materials

1988 ◽  
Vol 3 (3) ◽  
pp. 156-161 ◽  
Author(s):  
Gregory J. McCarthy ◽  
Diane M. Johansen
Keyword(s):  
Fly Ash ◽  
Powder Diffraction ◽  
Reference Materials ◽  
Diffuse Scattering ◽  
Standard Reference Materials ◽  
Phase Assemblage ◽  
National Bureau ◽  
X Ray ◽  
Tricalcium Aluminate ◽  
Ferrite Spinel

AbstractThe fly ash Standard Reference Materials (SRMs) issued by the U.S. National Bureau of Standards have been studied by X-ray powder diffraction (XRD). Based on observations of large diffuse scattering maxima in their X-ray diffractograms, it was evident that all of the ashes had a high glass content. SRM 1633a and 2689, derived from the combustion of bituminous coal, contained different amounts of quartz, mullite, hematite and ferrite spinel (magnetite). SRM 2891, derived from subbituminous coal had quite a different chemical composition and a more complex crystalline phase assemblage, that included these four phases plus anhydrite, tricalcium aluminate, lime, periclase and minor phases. SRM 2690, also derived from subbituminous coal, had only quartz, mullite and ferrite spinel as detectable phases in its diffractogram. Analytical CaO is an important factor in determining the phase assemblage; SRM 2691 had 25.8 wt%, SRM-2690 had 8.0%, and the ash derived from bituminous coals had only 1.6-3.0%. The changing composition of the glass phases in the SRMs is detected in a shift in the position and shape of the diffuse scattering maximum in the diffractograms. Use of an internal intensity standard permitted quantitative comparisons of the relative amounts of crystalline phases among the four fly ash SRMs.

Diagnostics of Gold Laser Plasmas

1988 ◽  
Vol 102 ◽  
pp. 357-360
Author(s):  
J.C. Gauthier ◽  
J.P. Geindre ◽  
P. Monier ◽  
C. Chenais-Popovics ◽  
N. Tragin ◽  
...  
Keyword(s):  
Experimental Results ◽  
Pure Gold ◽  
Electronic Temperature ◽  
X Ray ◽  
Laser Plasmas ◽  
Collisional Radiative Model ◽  
Radiative Model

AbstractIn order to achieve a nickel-like X ray laser scheme we need a tool to determine the parameters which characterise the high-Z plasma. The aim of this work is to study gold laser plasmas and to compare experimental results to a collisional-radiative model which describes nickel-like ions. The electronic temperature and density are measured by the emission of an aluminium tracer. They are compared to the predictions of the nickel-like model for pure gold. The results show that the density and temperature can be estimated in a pure gold plasma.

New horizons for the structural characterization of stainless steel slags by X-ray powder diffraction

2007 ◽  
Vol 2007 (suppl_26) ◽  
pp. 61-66 ◽  
Author(s):  
B. Peplinski ◽  
B. Adamczyk ◽  
G. Kley ◽  
K. Adam ◽  
F. Emmerling ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Powder Diffraction ◽  
Structural Characterization ◽  
X Ray ◽  
New Horizons
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