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.

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.

Pressure–temperature–composition relations in the system anthracene–phenanthrene

1967 ◽  
Vol 45 (10) ◽  
pp. 1125-1134 ◽  
Author(s):  
M. Xavier Brady ◽  
Norman O. Smith
Keyword(s):  
Solid Solutions ◽  
Cooling Curve ◽  
Vapor Pressures ◽  
Phase Line ◽  
X Ray ◽  
Three Phase ◽  
Liquid Solutions ◽  
Complete Series ◽  
Solid Liquid ◽  
Consolute Temperature

A melting point and cooling curve study of the solid–liquid equilibria in the system anthracene–phenanthrene indicated the existence of a complete series of solid solutions. Investigation of the system anthracene–phenanthrene–Cellosolve at 40 °C revealed that the series is incomplete at this temperature. X-ray studies showed an upper consolute temperature at about 80 °C. The sublimation pressures and vapor pressures of the pure components were measured at temperatures not heretofore studied. Sublimation pressure data for solid solutions at 95 °C gave activity coefficients and indicated positive deviations from Raoult's law. Liquid–vapor isobars were obtained at pressures of 25, 50, and 100 mm, and vapor pressures of dilute liquid solutions of anthracene in phenanthrene found at temperatures near 100 °C. The data point to the existence of an azeotrope of short range. The univariant three-phase line was determined in respect to the pressure, temperature, and composition of the coexisting phases.All the above results were synthesized to give a fairly complete picture of the pressure–temperature–composition phase model, excluding critical phenomena.

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.

Phase Equilibria in the System NaAlSi3O8–NaAlSiO4–H2O with Special Emphasis on the Stability of Analcite

1971 ◽  
Vol 8 (3) ◽  
pp. 311-337 ◽  
Author(s):  
Ki-Tae Kim ◽  
B. J. Burley
Keyword(s):  
Solid Solution ◽  
Phase Equilibria ◽  
Phase Diagrams ◽  
Solid Solutions ◽  
Singular Points ◽  
Phase Relations ◽  
The Other ◽  
Stability Field ◽  
Narrow Zone ◽  
The Stability

Phase equilibria were determined in the P–T range of 0.5–10 Kb and 150–900 °C in the system NaAlSi3O8 – NaAlSiO4 – H2O. Two isobaric (2 Kb and 5.15 Kb) T–X phase diagrams (projected to a dry base) were completely determined and show that the stability field of analcite solid solutions has a large distorted pentagonal shape. The phase relations for the transition: nepheline hydrate I [Formula: see text] nepheline + H2O on the composition join NaAlSiO4 – H2O are not binary. It was found that there exists a narrow zone for the transition. The true P–T curve was found and determined in terms of a ternary univariant reaction: nepheline hydrate I + analcite [Formula: see text] nepheline + H2O. In the system NaAlSi3O8 – SiO2 – H2O, albite contains about 5 wt % silica in solid solution at 5.15 Kb and 670 °C.The equilibrium compositions of various univariant phases were determined essentially on the basis of the T–X phase diagrams. Another univariant reaction (zeolite species P = analcite + nepheline – hydrate I + H2O) was found at 2 Kb/215 °C and 5.15 Kb/235 °C and determined on a P–T projection. Three singular points were determined; two of them are located at 0.8 Kb/390 °C and 9.4 Kb/475 °C respectively on a univariant P–T curve for the reaction nepheline hydrate I + analcite = nepheline + H2O; the other one is located at 6 Kb/655 °C on a univariant P–T curve along which nepheline, analcite, liquid, and vapor coexist. The petrogenetic implication of analcite is discussed fully.

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

Phase relations in cordierite-bearing gneisses from the Gananoque area, Ontario

1968 ◽  
Vol 5 (3) ◽  
pp. 455-482 ◽  
Author(s):  
E. W. Reinhardt
Keyword(s):  
Alkali Feldspar ◽  
Phase Relations ◽  
Chemical Compositions ◽  
Load Pressure ◽  
Field Evidence ◽  
Partial Pressures ◽  
Mineral Associations ◽  
Three Phase ◽  
External Conditions ◽  
End Members

Phase relations among sillimanite, cordierite, garnet, biotite, and hypersthene from regionally metamorphosed pelitic gneisses were determined from petrographic studies and the chemical compositions of 46 ferromagnesian minerals and 18 bulk rocks. The compatible mineral associations including quartz, feldspar, and opaque oxides are cordierite-sillimanite, cordierite-garnet-sillimanite, cordierite-garnet-biotite, cordierite-garnet-hypersthene, cordierite-biotite-hypersthene, cordierite-biotite, garnet-biotite, garnet-biotite-hypersthene, and biotite-hypersthene. The assemblages were graphically analyzed using A–F–M diagrams derived from compatibility tetrahedra by successive projections through the common phases quartz, alkali feldspar, plagioclase, magnetite, and ilmenite; this results in the subtraction of excess components such that A = Al2O3 − K2O − Na2O − CaO, F = FeO − Fe2O3 − TiO2, and M = MgO. Variations in the positions of the three-phase triangles defined by cordierite, garnet, and biotite in the A–F–M system are due to systematic variations of F: M ratios for these minerals and reveal that the external conditions of metamorphism were variable over the rock sequence studied. Partitioning of elements among coexisting minerals and field evidence indicate that equilibrium was reached at constant temperature in the gneisses around Gananoque Lake; possible variations in load pressure were inadequate to cause the observed variations in F/M. A correlation between the Fe+2/(Fe+2 + Mg) of coexisting ferromagnesian silicates and the oxidation ratios (2Fe2O3/(2Fe2O3 + FeO)) of respective rocks suggests that the mineralogical variations in F/M are a function of oxygen partial pressure. Increased oxygen pressures would give rise to magnetite at the expense of the ferromagnesian silicates, which would consequently become enriched in the magnesium end-members. It is further proposed that the equilibrium partial pressures of oxygen and water were interdependent in any small volume of pelitic gneiss during metamorphism, and that [Formula: see text] was the independent variable.

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

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.

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