Crystallisation of zeolitic molecular sieves: direct measurements of the growth behaviour of single crystals as a function of synthesis conditions

1993 ◽  
Vol 95 ◽  
pp. 235 ◽  
Author(s):  
Colin S. Cundy ◽  
Barrie M. Lowe ◽  
Douglas M. Sinclair
Keyword(s):  
Single Crystals ◽  
Molecular Sieves ◽  
Growth Behaviour ◽  
Synthesis Conditions ◽  
Direct Measurements

Influence of Synthesis Conditions for Yb:CaWO4 Single Crystals on the Down-Conversion Luminescence of Yb3+ Ions in These Crystals

2021 ◽  
Vol 29 (3) ◽  
pp. 187-198
Author(s):  
K. A. Subbotin ◽  
A. I. Titov ◽  
D. A. Lis ◽  
E. V. Chernova ◽  
O. N. Lis ◽  
...  
Keyword(s):  
Single Crystals ◽  
Synthesis Conditions ◽  
Down Conversion

Synthesis conditions of ordered mesostructured boron nitride prepared from borazinic precursors and CMK-3 carbon template

2005 ◽  
Vol 876 ◽  
Author(s):  
Philippe Dibandjo ◽  
Laurence Bois ◽  
Fernand Chassagneux ◽  
A. Vuillermoz ◽  
Philippe Miele
Keyword(s):  
Boron Nitride ◽  
Molecular Sieves ◽  
Size Analysis ◽  
X Ray Diffraction ◽  
Regular Array ◽  
Synthesis Conditions ◽  
Carbon Template ◽  
Ordered Mesoporous ◽  
Pore Size Analysis ◽  
Uniform Mesopores

AbstractThe preparation of ordered mesoporous boron nitride by using borazinic precursors as boron nitride source (tri(methylamino)borazine (MAB) and tri(chloro)borazine TCB) and a mesoporous carbon CMK-3 as template is reported. A template elimination performed by hydrogenation allows to obtain an organized porous structure. The X-ray diffraction, TEM and pore size analysis show that the structure of the BN molecular sieves synthesized from CMK-3 consists in a 2D regular array of uniform mesopores of 3.4 nm in diameter.

Synthesis and characterization of single crystals of SAPO-5, BAPO-5, and LiAPO-5 molecular sieves

Zeolites ◽  
1991 ◽  
Vol 11 (4) ◽  
pp. 371-375 ◽  
Author(s):  
Shilun Qiu ◽  
Wentong Tian ◽  
Wenqin Pang ◽  
Tie Sun ◽  
Dazhen Jiang
Keyword(s):  
Single Crystals ◽  
Molecular Sieves ◽  
Synthesis And Characterization

Kinetic Aspects of the Crystallization of SAPO-5 Molecular Sieves

1992 ◽  
Vol 57 (4) ◽  
pp. 756-766 ◽  
Author(s):  
Jan Kornatowski ◽  
Beate Kanz-Reuschel ◽  
Gerd Finger ◽  
Werner H. Baur ◽  
Martin Bülow ◽  
...  
Keyword(s):  
Experimental Data ◽  
Water Content ◽  
Single Crystals ◽  
Size Distribution ◽  
Kinetic Models ◽  
Molecular Sieves ◽  
Hydrothermal Crystallization ◽  
Nucleation Stage ◽  
Kinetics Of

The kinetics of hydrothermal crystallization of microporous silicoaluminophosphate SAPO-5 have been studied as a function of water content using the templates tripropylamine (TPA) and triethylamine (TEA). The investigation included the formation of the SAPO-5 phase, its growth in large single crystals, and the size distribution of the crystals. An attempt to fit the experimental data to kinetic models of crystallization is presented. The systems studied have been found to be very similar except for the nucleation stage which is mainly responsible for both the dimensions of the resulting crystals and for the purity of the SAPO-5 phase.

Transient 3D Simulation of a Submerged-Arc Furnace for Production of MgO Single Crystal

2011 ◽  
Vol 675-677 ◽  
pp. 995-998
Author(s):  
Zhen Wang ◽  
Ning Hui Wang ◽  
Tie Li
Keyword(s):  
Crystal Growth ◽  
Single Crystal ◽  
Single Crystals ◽  
Good Description ◽  
Element Model ◽  
Growth Direction ◽  
Direct Measurements ◽  
Determining Factors ◽  
Submerged Arc Furnace ◽  
Submerged Arc

High quality magnesium oxide (MgO) single crystals have been grown by an arc-fusion method. Due to the hostile environment for observing the process occurring in the inner zone of the furnace, direct measurements on the arcs by conventional diagnostic method are practically impossible. Moreover, it has been proved that the control of the temperature field of the whole system is crucial to grow high-purityMgO single crystals with large and super-large sizes. However, very few studies have been carried out to investigate the correlation between the thermal behavior and MgO single crystal growth in the furnace. In present study, a transient 3D finite element model has been developed to depict melt/crystal interface and to find out the determining factors that affect the crystal growth rate and the growth direction. It is shown that the model gave a good description of the bath shape which agrees well with that of the solidified MgO in experiments. By the transient analysis, the trend and time delay of the temperature variation on the shell were also predicted.

scholarly journals Synthesis and structural characterization of Fe1-xMexBO3 (Me = Al, Sc) single crystals

2021 ◽  
Vol 2103 (1) ◽  
pp. 012069
Author(s):  
Yu Mogilenec ◽  
K Seleznyova ◽  
S Yagupov ◽  
K Seleznev ◽  
I Nauhatsky ◽  
...  
Keyword(s):  
Single Crystals ◽  
Fluorescence Analysis ◽  
Flux Growth ◽  
X Ray Diffraction ◽  
Growth Technique ◽  
X Ray ◽  
Synthesis Conditions ◽  
Initial Charge ◽  
Crystal Lattice Parameters

Abstract Fe1-xMexBO3 (Me = Al, Sc) single crystals have been synthesized by flux growth technique using B2O3-PbO-PbF2 solvent and approach of identical synthesis conditions. The contents of the diamagnetic ions Me in the initial charge of both compositions were equal, xcharge=0.05. The exact contents and crystal lattice parameters of the synthesized crystals were determined by X-ray fluorescence analysis and X-ray diffraction, respectively.

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