A new direction in the creation of ceramic materials with a specified phase composition and structure. Part II. Theoretical foundations of low-temperature synthesis of SiC from gels and practical realization of this process in the technology of ceramics and refractories. 4. Mechanism of phase formation in the Al2O3 - SiC - Si - Pitch - ETS - H3BO4 system in the production of corundum refractories

2000 ◽  
Vol 41 (7-8) ◽  
pp. 220-227
Author(s):  
G. D. Semchenko
Keyword(s):  
Phase Composition ◽  
Low Temperature ◽  
Phase Formation ◽  
Ceramic Materials ◽  
Practical Realization ◽  
Low Temperature Synthesis ◽  
Temperature Synthesis ◽  
Composition And Structure ◽  
The Creation ◽  
Theoretical Foundations

scholarly journals Low-temperature synthesis of zeolite from perlite waste — Part II: characteristics of the products

2014 ◽  
Vol 32 (4) ◽  
pp. 526-532 ◽  
Author(s):  
Magdalena Król ◽  
Justyna Morawska ◽  
Włodzimierz Mozgawa ◽  
Waldemar Pichór
Keyword(s):  
Phase Composition ◽  
Low Temperature ◽  
Specific Surface ◽  
Cation Exchange ◽  
Cation Exchange Capacity ◽  
Exchange Capacity ◽  
Low Temperature Synthesis ◽  
Temperature Synthesis ◽  
Synthesis Parameters ◽  
Autogenous Pressure

AbstractThe paper investigates the properties of sodium zeolites synthesized using the hydrothermal method under autogenous pressure at low temperature with NaOH solutions of varying concentrations. During this modification, zeolites X, Na-P1 and hydroxysodalite were synthesized. The synthesis parameters, and thus, phase composition of resulting samples, significantly affected the specific surface area (SSA) and cation exchange capacity (CEC). SSA increased from 2.9 m2/g to a maximum of 501.2 m2/g, while CEC rose from 16 meq/100 g to a maximum of 500 meq/100 g. The best properties for use as a sorbent were obtained for perlite waste modified with 4.0 M NaOH at 70 °C or 80 °C.

scholarly journals Низкотемпературный синтез стеклокерамики с кристаллитами YNbO-=SUB=-4-=/SUB=- : Eu-=SUP=-3+-=/SUP=-

2021 ◽  
Vol 129 (2) ◽  
pp. 207
Author(s):  
В.А. Кравец ◽  
Е.В. Иванова ◽  
К.Н. Орехова ◽  
Г.А. Гусев ◽  
В.В. Васькевич ◽  
...  
Keyword(s):  
Low Temperature ◽  
Electron Probe ◽  
Glass Ceramics ◽  
Luminescent Properties ◽  
X Ray Diffraction ◽  
Low Temperature Synthesis ◽  
Temperature Synthesis ◽  
X Ray ◽  
Composition And Structure ◽  
First Time

The main purpose of this work was to carry out a low-temperature synthesis of glass ceramics containing YNbO4:Eu3+ crystallites and to study the structural and luminescent properties of the obtained samples. Within the framework of this work, the inclusions that crystallized under the conditions of low-temperature synthesis in the systems of SiO2-Na2O-K2O-Y2O3-Nb2O5-Eu2O3 (SiNaK) and B2O5-Na2O-Y2O3-Nb2O5-Eu2O3 (BNa) were investigated for the first time. It was shown that YNbO4: Eu3+ crystallized in both considered systems. In the SiNaK system the crystallization of SiO2 also occurred (quartz, crisstabolite, and tridymite) under the selected conditions. The BNa system proved to be the most promising for the synthesis of activated glass-ceramics with YNbO4, since the required crystallites crystallized only in ithis system. The luminescent properties of crystalline inclusions were investigated using the local cathodoluminescence technique. The composition and structure of glass ceramics were studied by electron-probe microanalysis and X-ray diffraction phase analysis.

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