Unconventional Route to High-Pressure and -Temperature Synthesis of GeSn Solid Solutions

2021 ◽  
Author(s):  
George Serghiou ◽  
Nicholas Odling ◽  
Hans Josef Reichmann ◽  
Kristina Spektor ◽  
Wilson A. Crichton ◽  
...  
Keyword(s):  
High Pressure ◽  
Solid Solutions ◽  
Temperature Synthesis ◽  
High Pressure And Temperature

scholarly journals High Pressure and Temperature Synthesis of Bi-based Perovskite (Bi0.5Na0.5-xLix)TiO3

2010 ◽  
Vol 35 (1) ◽  
pp. 111-114
Author(s):  
Masanori Fukunaga ◽  
Yasuhiro Yoneda ◽  
Ryota Fukuyama ◽  
Hiroyuki Saitoh ◽  
Naoshi Ikeda ◽  
...  
Keyword(s):  
High Pressure ◽  
Temperature Synthesis ◽  
High Pressure And Temperature

scholarly journals Study of silica-undersaturated magmas through the Kalsilite- Nepheline-Diopside-Silica system at 4.0 GPa and dry conditions

2018 ◽  
Vol 18 (2) ◽  
pp. 87-102
Author(s):  
Márcio Roberto Wilbert de Souza ◽  
Rommulo Vieira Conceição ◽  
Daniel Grings Cedeño ◽  
Roberto Vicente Schmitz Quinteiro
Keyword(s):  
High Pressure ◽  
Solid Solutions ◽  
Negative Correlation ◽  
Stability Field ◽  
Thermal Barrier ◽  
High Pressure And Temperature ◽  
Alkaline Magma ◽  
Magma Genesis ◽  
Dry Conditions ◽  
The Stability

This study experimentally investigates the Kalsilite-Nepheline-Diopside-Silica system at high pressure and temperature, with emphasis on silica-undersaturated volume (leucite-nepheline-diopside — Lct-Nph-Di; and kalsilite-nepheline-diopside — Kls + Nph + Di — planes), at 4.0 GPa (~120 km deep), temperatures up to 1,400ºC and dry conditions, to better understand the influence of K2O, Na2O, and CaO in alkali-rich silica-undersaturated magma genesis. In the Lct-Nph-Di plane, we determined the stability fields for kalsilite (Klsss), nepheline (Nphss) and clinopyroxene (Cpxss) solid solutions, wollastonite (Wo) and sanidine (Sa); and three piercing points: (i) pseudo-eutectic Kls + Nph + Di + liquid (Lct62Nph29Di9) at 1,000ºC; (ii) Kls + Sa + (Di + Wo) + liquid (Lct75Nph22Di2) at 1,200ºC; and (iii) pseudo-eutectic Kls + Di + Wo + liquid (Lct74Nph17Di9) at 1,000ºC. Kalsilite stability field represents a thermal barrier between ultrapotassic/potassic vs. sodic compositions. In the plane Kls-Nph-Di, we determined the stability fields for Klsss, Nphss and Cpxss and two aluminous phases in smaller proportions: spinel (Spl) and corundum (Crn). This plane has a piercing point in Kls + Nph + Di(± Spl) + liquid (Kls47Nph43Di10) at 1,100ºC. Our data showed that pressure extends K dissolution in Nph (up to 39 mol%) and Na in Kls (up to 27 mol%), and that these solid solutions, if present, determinate how much enriched in K and Na an alkaline magma will be in an alkaline-enriched metasomatic mantle. Additionally, we noted positive correlation between K2O and SiO2 concentration in experimental melts, negative correlation between CaO and SiO2, and no evident correlation between Na2O and SiO2. 

New Ceramic Phases in the Ternary Si-C-N System

2008 ◽  
Vol 403 ◽  
pp. 147-148 ◽  
Author(s):  
Ralf Riedel ◽  
Elisabeta Horvath-Bordon ◽  
Hans Joachim Kleebe ◽  
Peter Kroll ◽  
G. Miehe ◽  
...  
Keyword(s):  
High Pressure ◽  
State Of The Art ◽  
Technological Development ◽  
Ambient Pressure ◽  
High Hardness ◽  
Temperature Synthesis ◽  
High Pressure And Temperature ◽  
Ultra High Pressure ◽  
The One ◽  
Tin Nitride

The ultra-high pressure and temperature synthesis of spinel silicon nitride and germanium nitride on the one hand as well as the successful synthesis of tin nitride at ambient pressure on the other hand have caused an enormous impact on both basic science and technological development of advanced nitrides. Aim and scope of the research in this field is to synthesize novel nitrides for structural and functional applications. High presssure nitrides may combine ultra-high hardness with high thermal stability in terms of decomposition in different environments and are expected to show interesting optoelectronic properties. Here, the state of the art and the progress in the field of novel advanced nitrides and related materials synthesized reproducibly under high pressure are reviewed.

Formation of cubic C-BN by crystallization of nano-amorphous solid at atmosphere

1998 ◽  
Vol 13 (7) ◽  
pp. 1753-1756 ◽  
Author(s):  
Bin Yao ◽  
L. Liu ◽  
W. H. Su
Keyword(s):  
Solid Solution ◽  
Grain Size ◽  
High Pressure ◽  
Boron Nitride ◽  
Amorphous Carbon ◽  
Solid Solutions ◽  
Room Temperature ◽  
Amorphous Solid ◽  
High Energy ◽  
High Pressure And Temperature

An amorphous carbon-boron nitride (C-BN) solid was prepared by ball milling the mixture of graphite and hexagonal BN powders for a period of 120 h. After annealing the amorphous C-BN solid for 1 h at atmosphere in the temperature range from 800 to 900 K and then quenching it to room temperature, a small amount of cubic C-BN solid solutions with diamond-like structure, which belong to a high energy phase and can only be synthesized previously under high pressure and temperature (30 GPa, 2000 K), were observed in the annealed amorphous C-BN solid. The lattice constant of the cubic C-BN solid solution was 0.3587 nm, and its grain size was in the range of 10 to 50 nm.

scholarly journals High-Pressure and -Temperature Synthesis and its XPS Study of La1-xNaxTiO3.

1998 ◽  
Vol 7 ◽  
pp. 1031-1033
Author(s):  
Ji-Peng MIAO ◽  
Li-Ping LI ◽  
Da-Yong LU ◽  
Hong-Jian LIU ◽  
Wen-Hui SU
Keyword(s):  
High Pressure ◽  
Temperature Synthesis ◽  
High Pressure And Temperature ◽  
Xps Study
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