SUBSOLIDUS PHASE RELATIONS IN THE SYSTEM Ag–Sb

1966 ◽  
Vol 3 (2) ◽  
pp. 211-222 ◽  
Author(s):  
S. Somanchi
Keyword(s):  
Solid Solutions ◽  
Interplanar Spacing ◽  
Weight Percent ◽  
Phase Relations ◽  
High Angle ◽  
Subsolidus Phase ◽  
X Ray ◽  
Third Phase ◽  
Ε Phase ◽  
Atomic Silver

Phase relations were determined in the Ag–Sb system through the temperature range 500° to 300 °C to permit a better understanding of the origin of certain silver ores and to provide a base for the study of more complex sulfosalt systems. The Sb-rich solvus for the ε phase (Ag6 ± xSb) at 500°, 450°, 350°, and 300 °C occurs at 18.2, 17.75, 17.75, and 17.7 weight percent Sb, respectively. The Ag-rich solvus of the ε′ phase (dyscrasite) occurs at 22.5% Sb at 500 °C and 22.9% at 450°, 400°, 350°, and 300 °C. The Sb-rich solvus of this phase occurs at 27.2% Sb at 500°, 450°, 400°, and 350 °C. Therefore the atomic silver to antimony ratio ranges from nearly 4 to 3, and the formula may be written Ag7 ± xSb2. An order–disorder transition of ε′ to a third phase, ε″, reported to occur at about 440° to 449 °C, was not observed. The compositions of the solid solutions relate to high angle X-ray powder reflections through the following functions: for ε phase, d = 0.000150x + 0.79743, and for ε′ phase, d = 0.00160x + 0.76608, where d is the specific interplanar spacing in Ångstroms and x is the weight percent antimony.

LATTICE PARAMETERS OF MELILITE SOLID SOLUTIONS AND A RECONNAISSANCE OF PHASE RELATIONS IN THE SYSTEM Ca2Al2SiO7 (GEHLENITE) – Ca2MgSi2O7 (AKERMANITE) – NaCaAlSi2O7 (SODA MELILITE) AT 1 000 kg/cm2 WATER VAPOR PRESSURE

1965 ◽  
Vol 2 (6) ◽  
pp. 596-621 ◽  
Author(s):  
A. D. Edgar
Keyword(s):  
Solid Solutions ◽  
Water Vapor Pressure ◽  
Lattice Parameter ◽  
Lattice Parameters ◽  
Phase Relations ◽  
Ray Method ◽  
Subsolidus Phase ◽  
X Ray ◽  
Complete Solid Solution ◽  
Temperature Lattice

The extent of melilite solid solutions has been determined for the systems gehlenite–soda melilite, akermanite–soda melilite, and gehlenite–akermanite–soda melilite at 800 °C and 1 000 kg/cm2[Formula: see text] Approximately 50 weight % NaCaAlSi2O7 will form melilite solid solutions with both gehlenite and akermanite but the extent of complete solid solutions in the gehlenite–akermanite–soda melilite system is very limited at this temperature. Lattice parameter determinations of melilite solid solutions indicate that there is a small but significant change in both a and c parameters with increasing soda melilite in the gehlenite–soda melilite system. In the gehlenite–akermanite–soda melilite system, although the range of complete solid solution is very limited, melilites form more than 90% of the products in most compositions and their lattice parameters can be correlated approximately with their bulk compositions, A rapid X-ray method has been developed to determine the approximate compositions of melilites in this system. Comparison is made between the synthetic samples and natural melilites.A reconnaissance of subsolidus phase relations indicates that phase relations are very complex and that only over a very small compositional range can these systems be considered binary or ternary. These studies also indicate that the relations reported by Nurse and Midgley in 1953 should probably be modified. Although the composition NaCaAlSi2O7 does not synthesize only a melilite under the conditions used in this study, it is believed that this is the correct composition of the sodium-bearing end-member.

Subsolidus phase relations in the La2O3–Fe2O3–Al2O3 system

2001 ◽  
Vol 16 (3) ◽  
pp. 822-827
Author(s):  
Danjela Kuščer ◽  
Slavko Bernik ◽  
Marko Hrovat ◽  
Janez Holc
Keyword(s):  
Electron Microscopy ◽  
Phase Diagram ◽  
Scanning Electron Microscopy ◽  
Fuel Cell ◽  
Solid Oxide ◽  
Phase Relations ◽  
Oxide Fuel ◽  
Subsolidus Phase ◽  
X Ray ◽  
Scanning Electron

The subsolidus phase relations in the La–Fe–Al–O system were investigated for solid oxide fuel cell (SOFC) applications. Five compounds, LaAlO3, LaAl11O18, LaFe12O19, AlFeO3, and LaFeO3, coexist in the La–Fe–Al–O system at 1380 °C in air. The microstructure and composition of the samples were studied by x-ray diffractometry and scanning electron microscopy. Based on experimental evidence, a phase diagram of the La2O3–Al2O3–Fe2O3 system has been proposed.

Phase relations of the Ce2Co17–Sm2Co17 pseudo-binary system

2020 ◽  
Vol 111 (5) ◽  
pp. 373-378
Author(s):  
Chengfu Xu ◽  
Zhengfei Gu ◽  
Yongquan Yang ◽  
Dongdong Ma ◽  
Gang Cheng ◽  
...  
Keyword(s):  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Powder Diffraction ◽  
Solid Solutions ◽  
Vertical Section ◽  
Analysis Data ◽  
Phase Relations ◽  
Differential Thermal Analysis Data ◽  
Pseudobinary System ◽  
X Ray

Abstract The phase relations in the Ce2Co17-Sm2Co17 system over the whole concentration range have been studied by means of Xray powder diffraction, differential thermal analysis and scanning electron microscopy equipped with energy dispersive Xray spectroscopy. The X-ray powder diffraction results reveal that all the alloys (Ce1-xSmx)2Co17 are similar to the end member of the investigated system, Sm2Co17. It is implied that continuous solid solutions are formed in this system. The lattice parameters and unit cell volumes of (Ce1-xSmx)2Co17 solid solutions increase linearly with x increasing from 0 to 1.0. The occurrence of the polymorphic transformation reaction α-(Ce, Sm)2Co17 = β-(Ce, Sm)2Co17 is confirmed in the Ce2Co17-Sm2Co17 system, but its transition temperature cannot be determined. The differential thermal analysis measurements show that both the decomposition temperature and the Curie temperature of the (Ce1-xSmx)2Co17 alloys increase gradually with increasing Sm content. Based on the X-ray powder diffraction results and differential thermal analysis data, the tentative vertical section of Ce2Co17-Sm2Co17 pseudobinary system has been constructed.

Subsolidus phase relations of the Dy-Fe-Al system

2011 ◽  
Vol 26 (1) ◽  
pp. 9-15
Author(s):  
Y. Q. Chen ◽  
J. K. Liang ◽  
J. Luo ◽  
J. B. Li ◽  
G. H. Rao
Keyword(s):  
Solid Solution ◽  
Phase Relations ◽  
Unit Cell Parameters ◽  
Subsolidus Phase ◽  
X Ray ◽  
Cell Parameters ◽  
Ternary Compounds ◽  
Al Content ◽  
Three Phase ◽  
Binary Compounds

The subsolidus phase relations of the Dy-Fe-Al system have been investigated by means of X-ray powder diffraction. There are 5 ternary compounds, 10 binary compounds, and 21 three-phase regions in this system. The solid-solution regions of Dy(Fe1−xAlx)2, DyFe3−xAlx, Dy2(Fe1−xAlx)17, and DyFe12−xAlx have been determined based on the dependence of their unit-cell parameters on the Al content.

Subsolidus phase relations in La2O3–Bi2O3–CuO

1999 ◽  
Vol 14 (4) ◽  
pp. 274-275 ◽  
Author(s):  
X. L. Chen ◽  
W. Eysel
Keyword(s):  
Solid Solution ◽  
Ternary System ◽  
Powder Diffraction ◽  
Binary Compound ◽  
Phase Relations ◽  
Ternary Solid Solution ◽  
Solid Solution Series ◽  
Subsolidus Phase ◽  
X Ray ◽  
Solution Series

The subsolidus phase relations in the ternary system La2O3–Bi2O3–CuO at 900 °C were investigated by X-ray powder diffraction. A new binary compound, Bi2La4O9, was found, as well as a binary and a ternary solid solution series, Bi1−xLaxO1.5 (0.16≤x≤0.33) and La2−xBixCuO4 (0≤x≤0.11), respectively.

Investigations of the phase relations amonge1,e2 andC{\bar {\bf 1}} structures of Na-rich plagioclase feldspars: a single-crystal X-ray diffraction study

2017 ◽  
Vol 73 (5) ◽  
pp. 992-1006 ◽  
Author(s):  
Shiyun Jin ◽  
Huifang Xu
Keyword(s):  
Single Crystal ◽  
Structural Difference ◽  
Phase Relations ◽  
Miscibility Gap ◽  
X Ray Diffraction ◽  
Subsolidus Phase ◽  
Plagioclase Feldspar ◽  
X Ray ◽  
Two Samples ◽  
Different Temperatures

The subsolidus phase relations of plagioclase feldspar solid solution have been puzzling mineralogists and petrologists for decades, mainly due to the complicated structures of intermediate plagioclase at low temperature. The crystal structures of 12 Na-rich plagioclase samples are investigated by single-crystal X-ray diffraction analyses. The samples studied cover a compositional range from An21to An49(An is anorthite, CaAl2Si2O8), as well as a wide variety of origins, from extremely slow-cooled gabbroic rocks to pegmatite and metamorphic rocks. The structures fall into three different types:C{\bar 1},e2 ande1, with an obviously increasing trend in the ordering states of the structures. The phase transitions from C{\bar 1} toe2 ande2 toe1 are both continuous in nature, as no abrupt structure change is required for the transformation. However, the structural difference betweenC\bar 1 ande1 is large enough to create a miscibility gap causing the Bøggild intergrowth. As the plagioclase structure becomes more and more ordered, Al–Si reorganization in the framework would occur before the ordering of Ca and Na inMsites. Dramatic variations of Na occupancy would only appear ine1 structure with density modulation. This result confirms that Al–Si ordering is the major driving force of the formation ofe-plagioclase structure. The composition of the lower end of the Bøggild intergrowth is precisely constrained to An44–An45, based on the structural differences between two samples from the same pegmatite crystal. The modulation periods and directions ofe-plagioclase are dependent on the conditions at whiche-ordering starts to happen, other than the composition of the plagioclase. However, the three components (δh, δkand δl) of theqvector show strong linear correlations among one another, indicating some crystallographic constraint on the modulation direction which might be independent from the composition. The detailed subsolidus phase relations amonge1,e2 and C{\bar 1} are illustrated with a local phase diagram, and schematic free energy curves at different temperatures are provided.

Subsolidus phase relations in the system ZnWO4-ZnMoO4-MnWO4-MnMoO4

1968 ◽  
Vol 36 (283) ◽  
pp. 992-996 ◽  
Author(s):  
Luke L. Y. Chang
Keyword(s):  
Solid Solutions ◽  
Phase Region ◽  
Phase Relations ◽  
The Other ◽  
Central Portion ◽  
Subsolidus Phase ◽  
Three Phase ◽  
Complete Series ◽  
End Members

SummarySubsolidus phase relations in the systems ZnWO4-MnWO4, ZnWO4-ZnMoO4, MnMoO4-ZnMoO4, and MnWO4-MnMoO4, were investigated by using the quenching technique. A complete series of solid solutions forms in the system ZnWO4-MnWO4 above 840° C, whereas limited solid solubilities were found in the other three. The various limits of solubility are, at 620° C, 4·0 mole % ZnMoO4 in ZnWO4 and 4·0 mole % ZnWO4 in ZnMoO4, 13·0 mole % ZnMoO4 in MnMoO4 and 12·0 mole % MnMoO4 in ZnMoO4, 9·0 mole % MnMoO4 in MnWO4 and 6·0 mole % in MnWO4 in MnMoO4; and at 1000° C, 15·0 mole % ZnMoO4 in ZnWO4 and 15·0 mole % ZnWO4 in ZnMoO4, 36·0 mole % ZnMoO4 in MnMoO4 and 29·0 mole % MnMoO4 in ZnMoO4, 15·0 mole % MnMoO4 in MnWO4 and 27·0 mole % MnWO4 in MnMoO4.Subsolidus phase relations in the system ZnWO4-ZnMoO4-MnWO4-MnMoO4 were studied at 900° C. The solubility of molybdenum in the (Zn,Mn)WO4 series increases from both end members to a maximum of 27·0 mole % at the composition Mn35Zn65. Both molybdates also have limited ranges of solid solutions, and a three-phase region occupies the central portion of the system defined by three points with compositions of 41 mole % ZnMoO4, 26 mole % MnMoO4, 33 mole % MnWO4; 57 mole % ZnMoO4, 10 mole % MnMoO4, 35 mole % MnWO4; and 27 mole % ZnMoO4, 34 mole % MnWO4, 39 mole % ZnWO4.

Subsolidus phase relations and structures of solid solutions in the systems K2MoO4–Na2MoO4–MMoO4 (M = Mn, Zn)

2019 ◽  
Vol 272 ◽  
pp. 148-156 ◽  
Author(s):  
Oksana A. Gulyaeva ◽  
Zoya A. Solodovnikova ◽  
Sergey F. Solodovnikov ◽  
Vasiliy N. Yudin ◽  
Evgeniya S. Zolotova ◽  
...  
Keyword(s):  
Solid Solutions ◽  
Phase Relations ◽  
Subsolidus Phase

Subsolidus phase relations and crystal structures in the Pr1+xBa2−xCu3O7±δ system at 950 °C

2004 ◽  
Vol 19 (4) ◽  
pp. 320-324 ◽  
Author(s):  
G. B. Song ◽  
J. K. Liang ◽  
F. S. Liu ◽  
L. T. Yang ◽  
J. Luo ◽  
...  
Keyword(s):  
Solid Solution ◽  
Crystal Structures ◽  
Powder Diffraction ◽  
Single Phase ◽  
Rietveld Analysis ◽  
Phase Relations ◽  
Subsolidus Phase ◽  
X Ray ◽  
Rich Condition

Pr1+xBa2−xCu3O7±δ solid solution was investigated by means of X-ray powder diffraction and Rietveld analysis. Single-phase PrBa2Cu3O7±δ (Pr123) can be synthesized under a Pr-rich condition by sintering at 950 °C in air. The solubility of Pr1+xBa2−xCu3O7±δ solid solution is 0.08≤x≤0.80. The structure of Pr1+xBa2−xCu3O7±δ is orthorhombic for 0.08≤x<0.30, and transforms into tetragonal for 0.30≤x≤0.80. To form single-phase Pr123, the Ba sites in the Pr123 structure are partially occupied by excess Pr ions, and the smallest amount of excess Pr is x=0.08. Meanwhile, all Ba ions stay in the Ba sites.

Subsolidus phase relations of Mg-Ga-Fe-O spinel solid solutions

2010 ◽  
Vol 46 (9) ◽  
pp. 1019-1024 ◽  
Author(s):  
G. D. Nipan ◽  
V. A. Ketsko ◽  
T. N. Kol’tsova ◽  
M. A. Kop’eva ◽  
A. I. Stognii ◽  
...  
Keyword(s):  
Solid Solutions ◽  
Phase Relations ◽  
Subsolidus Phase ◽  
Spinel Solid Solutions
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