Structural Analysis of Some High-Pressure Stable and Metastable Phases in Lithium Borohydride LiBH4

2015 ◽  
Vol 119 (8) ◽  
pp. 3911-3917 ◽  
Author(s):  
Satoshi Nakano ◽  
Hiroshi Fujihisa ◽  
Hiroshi Yamawaki ◽  
Takumi Kikegawa
Keyword(s):  
High Pressure ◽  
Structural Analysis ◽  
Metastable Phases ◽  
Lithium Borohydride ◽  
Stable And Metastable Phases

Peraluminous sapphirine as a metastable reaction product in kyanite—gedrite—talc schist from Sar e Sang, Afghanistan

1975 ◽  
Vol 40 (310) ◽  
pp. 171-180 ◽  
Author(s):  
Werner Schreyer ◽  
Kurt Abraham
Keyword(s):  
High Pressure ◽  
Metastable Phases ◽  
Equilibrium Conditions ◽  
Host Mineral ◽  
Intermediate Products

SummaryMinute crystals of pure Mg-sapphirine approximating (Mg3.23Al4.74)vi(Al4.69Si1.31)ivO20, and thus having more aluminous compositions than the hitherto accepted 7:9:3 end member, were formed together with Mg-cordierite and corundum along narrow zones of the schist through reaction of the pre-existing high-pressure assemblages kyanite-gedrite and kyanite-talc. These sapphirines are considered to be metastable intermediate products growing under the influence of the structurally similar host mineral kyanite. Under equilibrium conditions they continued to react with kyanite to form the stable assemblage cordierite-corundum. Peraluminous sapphirines including those most recently synthesized may be metastable phases under all conditions of crystallization.

On the Coexistence of Chemically Similar Stable and Metastable Phases in the BeO–MgO–Al2O3–SiO2 System

2018 ◽  
Vol 12 (4) ◽  
pp. 756-760 ◽  
Author(s):  
M. A. Mikhailov ◽  
S. G. Mamontova ◽  
S. Z. Zelentcov ◽  
T. V. Demina ◽  
O. Yu. Belozerova ◽  
...  
Keyword(s):  
Metastable Phases ◽  
Sio2 System ◽  
Stable And Metastable Phases

scholarly journals Metastable phases and macroheterogeneous composites

2021 ◽  
Vol 29 (1) ◽  
pp. 65-68
Author(s):  
O. V. Sukhova
Keyword(s):  
Phase Diagram ◽  
Composite Materials ◽  
Abrasive Wear ◽  
Metastable Phase ◽  
Interfacial Reactions ◽  
Metastable Phases ◽  
Metastable Phase Diagram ◽  
Rapid Dissolution ◽  
Strong Adhesion ◽  
Stable And Metastable Phases

The way to control the interfacial reactions that processes during infiltration of macroheterogeneous composite materials is suggested. The idea is to combine the stable and metastable phases in the filler’s structure which dissolves at a different rate in the molten binder. To prove this approach, the structure and gas-abrasive wear of macroheterogeneous composite materials with Cu–20Ni–20Mn binder reinforced by Fe–(9.0–10.0)B–(0.01-0.2)C filler (in wt. %) cooled at 10–20 K/s or 103–104 K/s are studied. It is shown that the wear resistance of the investigated composite materials can be enhanced by accelerating interfacial reactions between the filler and the molten binder. Therefore, the composite materials produced from a rapidly cooled Fe–B–C filler show a higher resistance to gas-abrasive wear due to formation of Fe–Fe2(B,C) metastable eutectics in its structure. This eutectics crystallizes under metastable phase diagram due to the suppression of stable Fe2(B,C) phase formation and saturation of the rest of liquid by iron in the filler cooled at 103–104 K/s. As a result of rapid dissolution of the eutectics in the molten binder during infiltration, the strong adhesion at the interfaces of the composite materials is achieved which prevents the filler from spalling out under the impacts of abrasive.

Stable and metastable phases in Agl-containing silver borate glasses

1983 ◽  
Vol 28 (2) ◽  
pp. 273-278 ◽  
Author(s):  
G. Chiodelli ◽  
G. Flor ◽  
A. Magistris ◽  
G. Campari Vigano' ◽  
M. Villa
Keyword(s):  
Metastable Phases ◽  
Borate Glasses ◽  
Stable And Metastable Phases

scholarly journals Structural Analysis for Cellulose Fibers Treated by High Pressure Steam.

2003 ◽  
Vol 59 (3) ◽  
pp. 83-86 ◽  
Author(s):  
Naohisa Ohshima ◽  
Takahiro Itoh ◽  
Ihoko Shimohata ◽  
Mikiji Shigematsu ◽  
Mitsuhiko Tanahashi
Keyword(s):  
High Pressure ◽  
Structural Analysis ◽  
Cellulose Fibers ◽  
High Pressure Steam ◽  
Pressure Steam
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