Crystallization temperature and gas phase composition of alkaline effusives as indicated by primary melt inclusions in the phenocrysts

1971 ◽  
Vol 35 (2) ◽  
pp. 479-496 ◽  
Author(s):  
V. S. Sobolev ◽  
T. Yu Bazarova ◽  
I. T. Bakumenko
Keyword(s):  
Phase Composition ◽  
Gas Phase ◽  
Crystallization Temperature ◽  
Melt Inclusions ◽  
Primary Melt

Modified Physical Vapor Transport Growth of SiC - Control of Gas Phase Composition for Improved Process Conditions

2005 ◽  
Vol 483-485 ◽  
pp. 25-30 ◽  
Author(s):  
Peter J. Wellmann ◽  
Thomas L. Straubinger ◽  
Patrick Desperrier ◽  
Ralf Müller ◽  
Ulrike Künecke ◽  
...  
Keyword(s):  
Temperature Field ◽  
Phase Composition ◽  
Gas Phase ◽  
Growth Conditions ◽  
Vapor Transport ◽  
Physical Vapor Transport ◽  
Process Conditions ◽  
Growth Technique ◽  
Experimental Implementation ◽  
P Type

We review the development of a modified physical vapor transport (M-PVT) growth technique for the preparation of SiC single crystals which makes use of an additional gas pipe into the growth cell. While the gas phase composition is basically fixed in conventional physical vapor transport (PVT) growth by crucible design and temperature field, the gas inlet of the MPVT configuration allows the direct tuning of the gas phase composition for improved growth conditions. The phrase "additional" means that only small amounts of extra gases are supplied in order to fine-tune the gas phase composition. We discuss the experimental implementation of the extra gas pipe and present numerical simulations of temperature field and mass transport in the new growth configuration. The potential of the growth technique will be outlined by showing the improvements achieved for p-type doping of 4H-SiC with aluminum, i.e. [Al]=9⋅1019cm-3 and ρ<0.2Ωcm, and n-type doping of SiC with phosphorous, i.e. [P]=7.8⋅1017cm-3.

scholarly journals Silicate Melt Inclusions in Diamonds of Eclogite Paragenesis from Placers on the Northeastern Siberian Craton

Minerals ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 412 ◽  
Author(s):  
Vladislav Shatsky ◽  
Dmitry Zedgenizov ◽  
Alexey Ragozin ◽  
Viktoriya Kalinina
Keyword(s):  
Melt Inclusions ◽  
Silicate Melt ◽  
Aggregation State ◽  
Cooling Stage ◽  
Spectroscopic Analyses ◽  
New Findings ◽  
High Degree ◽  
Raman Spectral ◽  
Raman Spectral Analysis ◽  
Primary Melt

New findings of silicate-melt inclusions in two alluvial diamonds (from the Kholomolokh placer, northeastern Siberian Platform) are reported. Both diamonds exhibit a high degree of N aggregation state (60–70% B) suggesting their long residence in the mantle. Raman spectral analysis revealed that the composite inclusions consist of clinopyroxene and silicate glass. Hopper crystals of clinopyroxene were observed using scanning electron microscopy and energy-dispersive spectroscopic analyses; these are different in composition from the omphacite inclusions that co-exist in the same diamonds. The glasses in these inclusions contain relatively high SiO2, Al2O3, Na2O and, K2O. These composite inclusions are primary melt that partially crystallised at the cooling stage. Hopper crystals of clinopyroxene imply rapid cooling rates, likely related to the uplift of crystals in the kimberlite melt. The reconstructed composition of such primary melts suggests that they were formed as the product of metasomatised mantle. One of the most likely source of melts/fluids metasomatising the mantle could be a subducted slab.

Impact of Gas Phase Composition on Gas Hydrate Process for Carbon Dioxide Capturing from Gaseous Mixtures

2014 ◽  
Vol 625 ◽  
pp. 557-561 ◽  
Author(s):  
Behzad Partoon ◽  
Khalik Mohamad Sabil ◽  
Kok Keong Lau
Keyword(s):  
Carbon Dioxide ◽  
Phase Composition ◽  
Gas Phase ◽  
Gas Hydrate ◽  
Gas Mixtures ◽  
Gaseous Mixtures ◽  
Important Impact ◽  
New Process

Hydrate based technology is a promising new process for separation of Carbon dioxide from different gas mixtures. The process is claimed to be less energy intensive, green and low technology. In this article effect of composition on the efficiency of such process is discussed. CSMGem software is used for analysis. Results shows that gas phase composition have important impact on the efficiency of process.

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