Designed single-phase ZrO2 nanocrystals obtained by solvothermal syntheses

CrystEngComm ◽  
2020 ◽  
Vol 22 (10) ◽  
pp. 1802-1811
Author(s):  
Mayara S. Santos ◽  
Jair C. C. Freitas ◽  
Cleocir J. Dalmaschio
Keyword(s):  
Crystal Growth ◽  
Single Phase ◽  
Capping Agent ◽  
Crystalline Phases ◽  
Solvothermal Syntheses

Crystal growth pathways controlled by the acidity, type and concentration of the capping agent lead to different nanostructures and crystalline phases.

Growth of lithium borate crystals from the vitreous state

1994 ◽  
Vol 9 (8) ◽  
pp. 2051-2056 ◽  
Author(s):  
T. Katsumata ◽  
T. Yoshimura ◽  
K. Kanazawa ◽  
H. Aizawa
Keyword(s):  
Crystal Growth ◽  
Growth Mechanism ◽  
Compositional Variation ◽  
Lithium Borate ◽  
Morphological Instability ◽  
Vitreous State ◽  
Growth Interface ◽  
Crystalline Phases ◽  
The Core ◽  
Spherical Crystal

The morphology and the growth mechanism of lithium borate crystals from the vitreous state have been studied for various compositions, X = B/(Li + B), from 0.62 to 0.75. Crystalline phases and morphology of grown crystals varied with the composition. Octahedral and/or spherical Li2B4O7 crystals are seen in the specimen with X = 0.62, 0.64, 0.67, and 0.68. The spherical crystal is composed of an octahedral core and fibrous crystals. The size of the core varied with the composition of the starting glass, X. The fibrous crystal growth is supposed to arise from the morphological instability due to the compositional variation caused by the solute pileup at the growth interface.

Crystal growth and nucleation in two large diabase dikes

1970 ◽  
Vol 7 (2) ◽  
pp. 366-375 ◽  
Author(s):  
N. H. Gray
Keyword(s):  
Crystal Growth ◽  
Nucleation Rate ◽  
Unit Volume ◽  
Single Phase ◽  
Bulk Composition ◽  
Numerical Constant ◽  
N Value ◽  
Olivine Tholeiite

The total number of nuclei, Z, of a single phase formed in a unit volume of a crystallizing magma at the distance y from the contact of a semi-infinite intrusion is[Formula: see text]where n is a numerical constant determined by growth controlling process during the nucleation period and the value of m in the expression assumed for the nucleation rate, J[Formula: see text]The observed variation of Z for clinopyroxene and plagioclase from the contact towards the center of two large dikes appears to follow this relation. In the 106 m wide Kigaviarluk olivine tholeiite dike the value of n is significantly greater for the clinopyroxene (−2.2) than the plagioclase (−0.84). In the 60 m Grenville dike, a quartz tholeiite, the n value (−1.5) is the same for both minerals. The growth-controlling mechanisms of plagioclase and clinopyroxene appears to be sensitive to the bulk composition of the magma from which it is crystallizing.

Multi-Step Sintering Method Study of HP Y-SiAlON Ceramics

2008 ◽  
Vol 368-372 ◽  
pp. 908-909
Author(s):  
Jiu Jun Xu ◽  
Ying Chun Shan ◽  
Jiang Tao Li ◽  
Qin Ji Song
Keyword(s):  
Crystal Growth ◽  
Low Temperature ◽  
Hot Pressing ◽  
Single Phase ◽  
Nitrogen Atmosphere ◽  
One Step ◽  
Hot Pressing Sintering ◽  
Kinetics Of ◽  
Sintering Method ◽  
Kinetics Of Crystal Growth

Multi-step hot pressing sintering was adopted to prepare Y-SiAlON (Y0.4Si9.6Al2.4O1.2N14.8) at 1950°C for 60 min under 25 Mpa in nitrogen atmosphere, and the microstructure was studied. The phase assemblages, microstructures and densification of the sintered samples were discussed in detail. In order to contrast to multi-step sintering, one step sintering also was adopted. The results reveal that single-phase α-SiAlON with elongated grain pattern is formed in the multi-step sintering specimens, because of holding at low temperature in multi-step sintering is helpful to reduce the kinetics of crystal growth, the mount of elongated grain in multi-step sintering samples is more than that of in one step sintering ones.

Growth and Facet Orientations in Single-Phase TiAl Single Crystals

1994 ◽  
Vol 364 ◽  
Author(s):  
R. Mahapatra ◽  
H. Lin ◽  
D. P. Pope ◽  
Y. T. Chou
Keyword(s):  
Crystal Growth ◽  
Single Crystals ◽  
Single Phase ◽  
Tial Alloy ◽  
Solidification Rate ◽  
Floating Zone ◽  
X Ray Diffraction ◽  
X Ray ◽  
Electron Backscattering

AbstractSingle crystals of single-phase TiAl alloy (Ti-56 at. % Al) have been grown at lOmm/h solidification rate in an ASGAL FZ-SS35W Optical Floating Zone Furnace. The orientations of the resulting single crystals have been determined using the Laue X-ray diffraction, and Electron Backscattering Pattern (EBSP) methods. A correlation between orientations of the crystal growth and grown-in facets has been established.

A new surfactant-introduction strategy for separating the pure single-phase of metal–organic frameworks

2015 ◽  
Vol 51 (46) ◽  
pp. 9479-9482 ◽  
Author(s):  
Jun Zhao ◽  
Yenan Wang ◽  
Wenwen Dong ◽  
Yapan Wu ◽  
Dongsheng Li ◽  
...  
Keyword(s):  
Crystal Growth ◽  
Single Phase ◽  
Metal Organic Frameworks ◽  
Mixed Phase ◽  
Metal Organic

Surfactant-directed crystal growth can effectively separate mixed-phase crystals. By introducing different surfactants, two previous mixed-phase Ni(ii)–MOFs constructed from an undeveloped pyridyl-tetracarboxylate and Ni(ii) salts were successfully isolated to obtain two pure products.

Solvothermal Processes for Nitride Synthesis: Examples of Li3GaN2 and Graphitic C3N4 Elaboration

2008 ◽  
Vol 63 (6) ◽  
pp. 730-738 ◽  
Author(s):  
Graziella Goglio ◽  
Annaïg Denis ◽  
Etienne Gaudin ◽  
Christine Labrugère ◽  
Denis Foy ◽  
...  
Keyword(s):  
Crystal Growth ◽  
Closed System ◽  
Boiling Point ◽  
Carbon Nitride ◽  
Chemical Reactivity ◽  
Heterogeneous Systems ◽  
Solvothermal Process ◽  
Main Interest ◽  
Solvothermal Syntheses ◽  
Gan Crystal

When precursors decompose or react in the presence of a solvent in a closed system at a temperature higher than the solvent’s boiling point the reaction is called a solvothermal process. This reaction can be carried out either in supercritical or subcritical conditions, in homogeneous or heterogeneous systems, pressure and temperature being both key parameters. As the main interest of such processes is the enhancement of chemical reactivity, solvothermal reactions have been widely involved for nitride elaboration. We report two examples relative to solvothermal syntheses of nitrides. The first one deals with the elaboration of Li3GaN2: this ionic nitride has been successfully synthesized, structurally characterized and tested as nutrient for the ammonothermal GaN crystal growth. The second one is related to the elaboration of a well-crystallized graphitic carbon nitride (g-C3N4) aimed to be developed as a precursor for conversion towards dense CNx phases.

scholarly journals Influence of the Crystal Growth Temperature on the Formation of Zr Reach Crystalline Phases in a Nuclear Waste Confinement Glass Ceramic

2014 ◽  
Vol 4 (8) ◽  
Author(s):  
Dalila Moudir ◽  
Nour-el-hayet Kamel ◽  
Abdelbaki Benmounah ◽  
Yasmina Mouheb ◽  
Rafika Souag ◽  
...  
Keyword(s):  
Crystal Growth ◽  
Nuclear Waste ◽  
Growth Temperature ◽  
Glass Ceramic ◽  
Crystalline Phases
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