The Existence of an Immiscibility Region in the U-Zr-O System

2004 ◽  
Vol 42 (2) ◽  
pp. 242-251 ◽  
Author(s):  
V. G. Asmolov ◽  
V. N. Zagryazkin ◽  
E. V. Astakhova ◽  
V. Yu. Vishnevskii ◽  
E. K. D'yakov
Keyword(s):  
Immiscibility Region

scholarly journals Phase relations in the CuI-SbSI-SbI3 composition range of the Cu–Sb–S–I quaternary system

2021 ◽  
Vol 23 (2) ◽  
pp. 236-244
Author(s):  
Parvin R. Mammadli ◽  
Vagif A. Gasymov ◽  
Ganira B. Dashdiyeva ◽  
Dunya M. Babanly
Keyword(s):  
Quaternary System ◽  
Composition Range ◽  
Liquidus Surface ◽  
Polymorphic Transitions ◽  
X Ray ◽  
Immiscibility Region ◽  
Binary Section ◽  
Quasi Binary Section ◽  
Polythermal Sections ◽  
Primary Crystallisation

The phase equilibria in the Cu-Sb-S-I quaternary system were studied by differential thermal analysis and X-ray phase analysis methods in the CuI-SbSI-SbI3 concentration intervals. The boundary quasi-binary section CuI-SbSI, 2 internal polythermal sections of the phase diagram, as well as, the projection of the liquidus surface were constructed. Primary crystallisation areas of phases, types, and coordinates of non- and monovariant equilibria were determined. Limited areas of solid solutions based on the SbSI (b-phase) and high-temperature modifications of the CuI (α1- and α2- phases) were revealed in the system. The formation of the α1 and α2 phases is accompanied by a decrease in the temperatures of the polymorphic transitions of CuI and the establishment of metatectic (3750C) and eutectoid (2800C) reactions. It was also shown, that the system is characterised by the presence of a wide immiscibility region that covers a significant part of theliquidus surface of the CuI and SbSI based phases 

scholarly journals PHYSICO-CHEMICAL INTERACTION OF THE COPPER AND ANTIMONY IODIDES

2021 ◽  
pp. 43-47
Author(s):  
P.R. Mammadli ◽  
Keyword(s):  
Thermal Analysis ◽  
Phase Diagram ◽  
Differential Thermal Analysis ◽  
Chemical Interaction ◽  
Equilibrium Temperature ◽  
Polymorphic Transformations ◽  
X Ray ◽  
Immiscibility Region ◽  
Physico Chemical ◽  
Concentration Interval

The character of the mutual interaction of the components in the CuI-SbI3 system was studied by differential thermal analysis and X-ray phase analysis methods and its phase diagram was constructed. It was found that the system is quasi-binary and forms a monotectic phase diagram. The immiscibility region covers ~15-93 mol% SbI3 concentration interval at the monotectic equilibrium temperature (~ 4930С). The temperatures of polymorphic transformations of the CuI compound in the system drop slightly and these phase transitions take place by metatectic reactions

Calculation of metastable immiscibility region in the Al2O3–SiO2 system

1996 ◽  
Vol 11 (6) ◽  
pp. 1421-1427 ◽  
Author(s):  
Takayuki Ban ◽  
Shigeo Hayashi ◽  
Atsuo Yasumori ◽  
Kiyoshi Okada
Keyword(s):  
Phase Separation ◽  
Phase Diagrams ◽  
Regular Solution ◽  
Regular Solution Model ◽  
Liquid Immiscibility ◽  
Miscibility Gap ◽  
Stable Phase ◽  
Liquidus Data ◽  
Metastable Liquid ◽  
Immiscibility Region

Metastable liquid-liquid immiscibility region in the Al2O3–SiO2 system was calculated by a regular solution model using three sets of liquidus data from the stable phase diagrams reported. These calculations indicated that the immiscibility region was richer in Al2O3 composition than those reported before. A miscibility gap calculated using the liquidus data reported by Klug et al. [F. J. Klug, S. Prochazka, and R. H. Doremus, J. Am. Ceram. Soc. 70, 750 (1987)] (model A) ranged from 2.6 to 71 mol % Al2O3 at around 1000 °C, which was the most compatible result with the idea that metastable pseudotetragonal mullite crystallized at around 1000 °C became Al2O3-rich composition due to the immiscibility phase separation before mullitization among three sets of liquidus data.

In Situ Observation of Phase Separation of a Barium Borate Melt in a Stable Immiscibility Region under Microgravity

2005 ◽  
Vol 80 (9) ◽  
pp. 2413-2417 ◽  
Author(s):  
Satoru Inoue ◽  
Akio Makishima ◽  
Hiroyuki Inoue ◽  
Kohei Soga ◽  
Tomoya Konishi ◽  
...  
Keyword(s):  
Phase Separation ◽  
In Situ Observation ◽  
Barium Borate ◽  
Immiscibility Region

Microstructural development of rapidly solidified, phase-separated SiO2-Al2O3 glass

1986 ◽  
Vol 44 ◽  
pp. 442-443
Author(s):  
A. P. Taglialavore ◽  
W. M. Kriven ◽  
S. H. Risbud
Keyword(s):  
Liquid Immiscibility ◽  
Miscibility Gap ◽  
Microstructural Development ◽  
Indirect Methods ◽  
Immiscibility Region ◽  
Wide Range ◽  
Quenched Glass ◽  
Rapidly Solidified ◽  
Ice Water ◽  
Sharp Interfaces

A metastable miscibility gap has been shown to exist oyer much of the SiO2(s) -mullite(s) phase field by various indirect methods. The various proposed boundaries of this liquid-liquid immiscibility region, however, significantly disagree in their widths and critical point positions. The overall aim of our research is to directly determine the miscibility gap boundaries by using TEM/EDS on suitably equilibrated phases of rapidly solidified SiO2-Al2O3 glass. Rapid solidification by roller quenching (∼106°C/sec) and by ice- water quenching (~1035°C/sec) was used so that a wide range of compositions could be studied. SiO2-Al2O3 melts with more than ∼30 wt% Al2O3 readily crystallize when slowly cooled. A suitable microstructure for EDS requires homogeneous phases that are separated by sharp interfaces, and are large enough to withstand beam damage. In an attempt to meet these requirements, the as-quenched glass microstructures were developed by annealing for various times at suitable temperatures.

Preparation of Na2OSiO2 glasses in the metastable immiscibility region

1986 ◽  
Vol 82 (1-3) ◽  
pp. 177-182 ◽  
Author(s):  
A. Yasumori ◽  
S. Inoue ◽  
M. Yamane
Keyword(s):  
Immiscibility Region

Iron-rich talc-opal-minnesotaite spherulites and crystallochemical relations of talc and minnesotaite

1983 ◽  
Vol 47 (343) ◽  
pp. 229-231 ◽  
Author(s):  
P. C. A. Kager ◽  
I. S. Oen
Keyword(s):  
Colloidal Silica ◽  
Metastable Equilibrium ◽  
Residual Liquid ◽  
Equilibrium Conditions ◽  
Se Spain ◽  
Immiscibility Region ◽  
Isomorphic Series ◽  
Silica Rocks ◽  
Lead Zinc ◽  
Silica Sols

AbstractZoned spherulites in greenalite-siderite-silica rocks of the Emilia-San Valentin lead-zinc deposit, Sierra de Cartagena, SE Spain, show a core of iron-rich talc, (Mgl.8Fel.2)Si4Ol0(OH)2, an intermediate zone of opal-chalcedony, and a rim of minnesotaite, (Fe2.7Mg0.3)Si4Ol0(OH)2. Crystalllization of the spherulites, presumably from undercooled silica sols carrying dissolved Mg and Fe, began with the non-equilibrium precipitation of metastable iron-rich talc; the residual fluids enveloping the growing spherulites became more iron-rich in composition until metastable equilibrium between iron-rich talc and iron-enriched residual liquid impeded the further growth of the iron-rich talc; the spherulites were then overgrown by colloidal silica flocculates and a rim of minnesotaite precipitated from the iron-enriched residual fluid. The proposed crystallization model implies that, if talc and minnesotaite represent an isomorphic series, under equilibrium conditions there is a broad immiscibility region in the series.

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