scholarly journals Caracterização metalúrgica de ligas de Ni-Cr para metalocerimica

2021 ◽  
Vol 40 (1) ◽  
pp. 57-59
Author(s):  
Carlos Ariel Samudio Perez ◽  
Cezar Augusto Garbin
Keyword(s):  
Solid Solution ◽  
Diffraction Analysis ◽  
The Other ◽  
Secondary Phases ◽  
X Ray Diffraction ◽  
X Ray ◽  
Hardness Tests ◽  
Density Values ◽  
Cubic Structure ◽  
Hardness Values

Alternative Ni-Cr alloys applied in dentistry of two commercial brands for ceramometal restoration were evaluated. The alloys were analyzed in the commercial and after casting conditions using experimental techniques of metallography, X-ray diffraction, superficial hardness and density. The metalografics and X-ray diffraction analysis showed that, the alloys microstructure is marked with the presence of a solid solution having an ordered face- centred cubic structure, Ni-rich austenitic (y phase) matrix, and with fine precipitates particles of secondary phases. The Vicker hardness tests showed a decrease in hardness values of the studied alloys aer casting. The alloys density values, on the other hand, did not manifest changes.

Compression and Compressibility Studies of Plutonium and a Plutonium-Gallium Alloy

1980 ◽  
Vol 24 ◽  
pp. 221-230 ◽  
Author(s):  
R. B. Roof
Keyword(s):  
Solid Solution ◽  
The Other ◽  
X Ray Diffraction ◽  
X Ray ◽  
Metal Foils ◽  
Gallium Alloy

Two metal foils, one pure plutonium and the other being a solid solution of 6.5 a/o gallium In plutonium, were examined, in-situ, by X-ray diffraction techniques while under pressure. The purpose was to determine the compression and compressibility of these materials as a function of pressure and to identify the products of any transformation that may occur due to the action of applied pressures.

Phase equilibria in the BaTiO3–La2TiO5–TiO2 system

1998 ◽  
Vol 13 (5) ◽  
pp. 1327-1334 ◽  
Author(s):  
Srečo Škapin ◽  
Drago Kolar ◽  
Danilo Suvorov ◽  
Zoran Samardžija
Keyword(s):  
Solid Solution ◽  
Electron Probe ◽  
Ternary Solid Solution ◽  
Secondary Phases ◽  
X Ray Diffraction ◽  
Binary Solid Solution ◽  
Subsolidus Phase ◽  
X Ray ◽  
Tie Lines ◽  
Scanning Electron

Subsolidus phase relations in the BaTiO3–La2TiO5–TiO2 part of the ternary BaO–La2O3–TiO2 system at 1300 °C in air were determined. The phases were characterized by x-ray diffraction, scanning electron microscopy, and electron probe wavelength dispersive spectroscopic microanalysis. A combination of techniques was employed because of insensitivity in detecting secondary phases by x-ray diffraction. The location and extent of Ba6−xLa8+2x/3Ti18O54 ternary solid solution 0.2(1) ⩽ x ⩽ 2.3(1) and Ba1−yLayTi1−y/4 (VTi)y/4O3 binary solid solution 0 ⩽ y ⩽ 0.3 at 1300 °C was established. Tie lines between various barium polytitanates with a sequence of Ba6−xLa8+2x/3Ti18O54 solid solution regions were determined.

Glass-Coated Cu-Mn-Ga Microwires Produced by Taylor-Ulitovsky Technique

2009 ◽  
Vol 152-153 ◽  
pp. 79-84 ◽  
Author(s):  
Joan Josep Suñol ◽  
L. Escoda ◽  
C. García ◽  
V.M. Prida ◽  
Victor Vega ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Solid Solution ◽  
Curie Temperature ◽  
Energy Dispersive Spectroscopy ◽  
Room Temperature ◽  
Alloy Composition ◽  
The Other ◽  
X Ray Diffraction ◽  
X Ray ◽  
Low Magnetic Field

Glass-coated Cu-Mn-Ga microwires were fabricated by Taylor-Ulitovsky technique. By means of energy dispersive spectroscopy microanalysis, an average alloy composition of Cu56Ga28Mn16 was determined. The temperature dependence of magnetization measured at a low magnetic field showed the coexistence of two ferromagnetic phases. The Curie temperature of one phase is 125 K and above room temperature for the other one. X-ray diffraction at room temperature and at 100 K reflects the presence of the same three crystalline phases corresponding to the cubic B2 Cu-Mn-Ga structure as a main phase and the minor phases of fcc Cu rich solid solution with Mn and Ga and the monoclinic CuO.

The solid solution between platinum and palladium in nature

2013 ◽  
Vol 77 (3) ◽  
pp. 269-274 ◽  
Author(s):  
L. Bindi ◽  
F. Zaccarini ◽  
G. Garuti ◽  
N. Angeli
Keyword(s):  
Solid Solution ◽  
Single Crystal ◽  
Structural Data ◽  
Micro Hardness ◽  
Metallic Elements ◽  
X Ray Diffraction ◽  
X Ray ◽  
Complete Solid Solution ◽  
Hardness Values ◽  
Palladium Platinum

AbstractChemical and structural data are reported for platinum–palladium intermediates from two nuggets found at Córrego Bom Sucesso, Minas Gerais, Brazil. Three grains with simple stoichiometries (i.e. PtxPd1−x with x ∼0.67, ∼0.5 and ∼0.33, which correspond to Pt2Pd, PtPd and PtPd2, respectively) were characterized by single-crystal X-ray diffraction and electron-probe microanalysis. In the absence of single-crystal data it might be tempting to hypothesize that such simple stoichiometries represent distinct mineral species, however structural analyses show that all of the phases are cubic and crystallize in space group Fmm. They are, therefore, natural intermediates in the palladium–platinum solid solution. Reflectance and micro-hardness values are reported for the samples and a comparison with the pure metallic elements made. On the basis of information gained from the chemical and structural characterization it can be concluded that there is a complete solid solution between Pt and Pd in nature. These findings corroborate results from experiments on synthetic compounds.

Ion Beam Mixing Effects in Au-Fe and Pt-Fe Thin Bilayers

1983 ◽  
Vol 27 ◽  
Author(s):  
G. Battaglin ◽  
A. Carnera ◽  
G. Celotti ◽  
G. Della Mea ◽  
V.N. Kulkarni ◽  
...  
Keyword(s):  
Solid Solution ◽  
Diffraction Analysis ◽  
Linear Dependence ◽  
Ion Beam ◽  
Bilayer Structure ◽  
Square Root ◽  
X Ray Diffraction ◽  
Ion Beam Mixing ◽  
X Ray ◽  
Mixing Effects

ABSTRACTMixing effects induced by Kr++ bombardment in the Au-Fe and Pt-Fe metallic systems have been studied by Rutherford backscattering and X-ray diffraction techniques. The mixed amount of Fe atoms shows a linear dependence on the square root of the Kr do se for both systems. The induced mixing appears more efficient for the Pt-Fe with respect to the Au-Fe system. In the case of Pt-Fe mixing is much more efficient when the initial bilayer structure has Pt on the top. The X-ray diffraction analysis reveals the formation of an extended solid solution of Fe in Pt, having the Fe40 Pt60 composition.

scholarly journals Powder X-ray Diffraction Analysis of Lime-Phase Solid Solution in Converter Slag

2015 ◽  
Vol 55 (3) ◽  
pp. 616-622 ◽  
Author(s):  
Ippei Nishinohara ◽  
Naoki Kase ◽  
Hirokazu Maruoka ◽  
Shoji Hirai ◽  
Hiromi Eba
Keyword(s):  
Solid Solution ◽  
Diffraction Analysis ◽  
Converter Slag ◽  
X Ray Diffraction ◽  
X Ray

scholarly journals Sintering Mechanism of silicon from K2SiF6-Al

2020 ◽  
Vol 165 ◽  
pp. 03045
Author(s):  
Zhaoke Pan ◽  
Jinhua Wang ◽  
Guizhai Zhang
Keyword(s):  
Diffraction Analysis ◽  
Formation Process ◽  
The Other ◽  
Reaction Process ◽  
X Ray Diffraction ◽  
Solid Reaction ◽  
Reaction Stage ◽  
X Ray ◽  
Liquid Reaction ◽  
Solid Liquid

In order to clarify the reaction process of Si phase, Differential Scanning Calorimeter (DSC), as the main measurement, was used to prepare Si samples and monitor the sintering reaction process. Combined with X-ray diffraction analysis, the formation process of Si phase was summarized. The reaction between K2SiF6 and Al powders occurred at 580°C, but not completed until 660°C. The whole formation process of Si includes two different stages: One is the solid–solid reaction stage, the other is the solid–liquid reaction stage.

Structures of (ND4)2V(SO4)2.6D2O and (ND4)2V0.45Zn0.55(SO4)2.6D2O At 5.8 K by Neutron Diffraction

1988 ◽  
Vol 41 (9) ◽  
pp. 1289 ◽  
Author(s):  
RJ Deeth ◽  
BN Figgis ◽  
JB Forsyth ◽  
ES Kucharski ◽  
PA Reynolds
Keyword(s):  
Solid Solution ◽  
Neutron Diffraction ◽  
Bond Length ◽  
Crystal Structures ◽  
The Other ◽  
Tetragonal Distortion ◽  
X Ray Diffraction ◽  
Tutton Salts ◽  
X Ray

The crystal structures of (ND4)2V(SO4)2.6D2O and (ND4)2V0.45Zn0.55(SO4)2.6D2O have been determined at 5.8 K by neutron diffraction. The 663 and 857 unique reflections measured respectively refined to give R(F2) 0.035 and 0.045. The crystals are monoclinic, P21/a, isostructural with the other members of the series of Tutton salts. The V-O bond length of 211.8 pm [210.4 pm for mean (V/Zn)-O in the solid solution with Zn] is intermediate between these for the Mn (214.9 pm) and the Ni(205.5 pm) salts. It is shorter than the value determined by X-ray diffraction at 295 K. The major departure from a regular VO6 octahedron is a shortened V-O(9) bond, such as is observed in the other Tutton salts, to give a tetragonal distortion.

Tetragonal to orthorhombic transformation during mullite formation

1991 ◽  
Vol 6 (4) ◽  
pp. 819-824 ◽  
Author(s):  
Dong X. Li ◽  
William J. Thomson
Keyword(s):  
Solid Solution ◽  
Single Phase ◽  
Sol Gel ◽  
The Other ◽  
Processing Conditions ◽  
Mullite Formation ◽  
X Ray Diffraction ◽  
X Ray ◽  
Mullite Phase ◽  
Increasing Temperature

The mullite formation process in both single phase and diphasic sol-gel precursors to mullite was studied using dynamic x-ray diffraction (DXRD). A metastable, tetragonal-like mullite phase was observed in all the single gels at temperatures from 980 °C to 1200 °C, but not in any of the other precursors. The tetragonal to orthorhombic mullite transformation was very slow as the lattice parameters, a and b, split and moved gradually away from each other as a result of a gradual decrease of alumina content in the mullite solid solution with increasing temperature from 1100 °C to 1200 °C. The formation of tetragonal mullite coincides with that of the Al–Si spinel. The occurrence of tetragonal mullite or the spinel (or both) is determined mainly by the processing conditions of the sol-gel precursors.

Sign in / Sign up

Export Citation Format

Share Document