Synthesis of Plate-Like SrTiO3 Particles

2010 ◽  
Vol 663-665 ◽  
pp. 1024-1027
Author(s):  
Wei Zhao ◽  
Ruo Cai Pan ◽  
Hao Xue
Keyword(s):  
Aspect Ratio ◽  
Grain Growth ◽  
High Aspect Ratio ◽  
Growth Process ◽  
The Other ◽  
X Ray Diffraction ◽  
Templated Grain Growth ◽  
X Ray ◽  
Micro Scale ◽  
Textured Ceramics

Micro-scale plake-like SrTO3 particles were synthesized by two routes of topochemical conversion. One is by growing on Sr3Ti2O7 (S3T2) core particles in molten salt condition, and the other is from the layer-structured SrBi4Ti4O15 (SBT) precursor in a KCl medium. The effects of the morphology and size of the precursor to platelet SrTiO3 crystals were studied. X-ray diffraction analysis revealed that the crystallographic {010} plane of SBT was converted into the pseudo-cubic {001} plane of SrTiO3. The polycrystalline SrTiO3 particles from BST precursor exhibited a plate-like shape with 10-15μm in length and a high aspect ratio, and were more suitable for preparing textured ceramics by templated grain growth process than the platelets from the S3T2 precursors.

High Aspect Ratio Hydroxyapatite Nanorods Formed by Polymer Assisted Synthesis

2014 ◽  
Vol 508 ◽  
pp. 52-55
Author(s):  
A. Joseph Nathanael ◽  
R. Yuvakkumar ◽  
Tae Hwan Oh ◽  
Sun Ig Hong
Keyword(s):  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Morphological Analysis ◽  
Polymer Concentration ◽  
Xrd Analysis ◽  
Controlled Synthesis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Length Width ◽  
Size Controlled

High aspect ratio (length/width) of hydroxyapatite (HA) nanorods were prepared by polymer assisted hydrothermal synthesis. The aspect ratio of the nanorods was increased in the presence of polymer in hydrothermal method. Structural analysis was carried out by X-ray diffraction (XRD) analysis to find the purity and the crystal structure of the material. Morphological analysis was carried out by field emission scanning electron microscope (FESEM) to find the morphological variation in the presence of polymer concentration compared to pristine HA. The increased aspect ratio of the HA was visible from the morphological analysis. This shape and size controlled synthesis have an important impact in many field of research.

Effect of Template Particle Formation on Texture Development in Bi0.5Na0.5TiO3 Ceramics

2008 ◽  
Vol 388 ◽  
pp. 209-212 ◽  
Author(s):  
Toshio Kimura ◽  
Takao Motohashi
Keyword(s):  
Grain Growth ◽  
Growth Process ◽  
Particle Formation ◽  
Texture Development ◽  
Templated Grain Growth ◽  
Textured Ceramics ◽  
Small Grains ◽  
Template Particle

The factor determining texture development was examined for Bi0.5Na0.5TiO3 ceramics made by the reactive-templated grain growth process using platelike Bi4Ti3O12 particles as reactive template. Platelike, skeleton Bi0.5Na0.5TiO3 particles were formed by the reaction between Bi4Ti3O12 and Na2CO3 in calcined compacts. Coalescence of small grains in the skeleton particles to form single template particles was important to obtain highly textured ceramics.

PHASE-FIELD SIMULATION FOR MICROSTRUCTURAL DEVELOPMENT OF TEXTURED CERAMICS PREPARED BY REACTION TEMPLATED GRAIN GROWTH

2012 ◽  
Vol 02 (01) ◽  
pp. 1250009 ◽  
Author(s):  
LIANGLIANG LIU ◽  
FENG GAO ◽  
GUOXIN HU ◽  
JIANGNAN LIU
Keyword(s):  
Aspect Ratio ◽  
Grain Growth ◽  
Phase Field ◽  
Size Fraction ◽  
Phase Field Method ◽  
Microstructural Development ◽  
Templated Grain Growth ◽  
Textured Ceramics ◽  
The Matrix ◽  
Simulation Results

A modified model using phase-field method in order to describe the microstructural development for the reaction templated grain growth process was developed. The current model well expressed anisotropic enlargement of the template particles. The initial parameters such as the matrix particles size, the template particles size, fraction, aspect ratio of the template particles and porosity were examined. The simulation results show that the fraction of oriented grains increases with decreasing the matrix particles size and porosity, and increasing the fraction of the initial template particles. An increase for the aspect ratio of template particles gives rise to the anisotropic microstructure development. The study suggests that the simulation results would give a guiding principle in terms of the initial preparation conditions for the textured ceramics having both a large fraction of oriented grains and anisotropic microstructure.

Rapid projection of crystal grain orientation distribution in aluminium alloy sheets by synchrotron X-ray diffraction

1998 ◽  
Vol 5 (3) ◽  
pp. 1139-1140
Author(s):  
K. Kawasaki ◽  
M. Koizumi ◽  
H. Inagaki
Keyword(s):  
Aluminium Alloy ◽  
Grain Growth ◽  
Grain Orientation ◽  
Growth Process ◽  
Orientation Distribution ◽  
Primary Recrystallization ◽  
X Ray Diffraction ◽  
X Ray ◽  
Cold Rolled ◽  
Small Grains

An investigation of the primary recrystallization and the grain growth process of aluminium alloy sheets has been carried out using a method for rapid projection of the crystal grain orientation distribution. It is found that the projected pattern is continuous in the cold-rolled state. When the sheet is annealed, tiny diffraction spots or small grains appear. The addition of Mg greatly alters the sizes and number of grains, and the orientation of the grains in sheets.

Some Aspects on Thermal Degradation of Organo-Layer Silicates

2008 ◽  
Author(s):  
Mervat S. Hassan ◽  
Hassan El-Shall ◽  
Chearly Beaty
Keyword(s):  
Aspect Ratio ◽  
Thermal Degradation ◽  
High Aspect Ratio ◽  
Layered Silicates ◽  
X Ray Diffraction ◽  
X Ray ◽  
Naturally Occurring ◽  
Organically Modified ◽  
The Relationship ◽  
Thermal Stability Of

Naturally occurring silicates, like montmorillonite (MMT) have received much attention as reinforcement materials for polymers because of their potentially high aspect ratio and unique intercalation (exfoliation) characteristic. Montmorillonite is of particular interest because it has a layered structure typically about 1nm in thickness and a high aspect ratio ranging from 100 to 1500 that, with proper exfoliation, can lead to platelets with high stiffness and strength dispersed in the polymer matrix. In this paper, we studied the delamination of Egyptian bentonite and Cloisite Na+ (USA) using different onium ions. The organo-clays were characterized by X-ray diffraction (XRD), Differential Scanning Calorimeter (DSC), Derivativethermogravimetry (TGA), Thermogravimetry (TG), and Infrared spectroscopy (IR). Understanding the relationship between molecular structure of the modifying surfactant and the thermal stability of the organically modified layered silicates is critical to its processing and subsequent applications. Therefore, special emphasis is given to the study of the thermal degradation of the modified clays. The results of the thermal degradation of montmorillonite (MMT) and alkyl quaternary ammonium montmorillonite (OMMT) are discussed in this paper.

The Electron Effect of Aromatic Group: Control Conformation of 2-Aromatic Cyclododecanone Derivatives

2020 ◽  
Vol 24 (10) ◽  
pp. 1139-1147
Author(s):  
Yang Mingyan ◽  
Wang Daoquan ◽  
Wang Mingan
Keyword(s):  
1H Nmr ◽  
13C Nmr ◽  
Nmr Spectra ◽  
Coupling Constants ◽  
The Other ◽  
Repulsive Interaction ◽  
X Ray Diffraction ◽  
X Ray ◽  
Electron Effect ◽  
Group Control

2-Phenylcyclododecanone and 2-cyclohexylcyclododecanone derivatives were synthesized and characterized by 1H NMR, 13C NMR, HR-ESI-MS and X-ray diffraction. Their preferred conformations were analyzed by the coupling constants in the 1H NMR spectra and X-ray diffraction, which showed the skeleton ring of these derivatives containing [3333]-2-one conformation, and the phenyl groups were located at the side-exo position of [3333]-2-one conformation due to the strong π-π repulsive interaction between the π- electron of benzene ring and π-electron of carbonyl group. The cyclohexyl groups were located at the corner-syn or the side-exo position of [3333]-2-one conformation depending on the hindrance of the other substituted groups. The π-π electron effect played a crucial role in efficiently controlling the preferred conformation of 2-aromatic cyclododecanone and the other 2-aromatic macrocyclic derivatives with the similar preferred square and rectangular conformations.

PHASE TRANSITION IN LAYERED PEROVSKITE LIKE MANGANATE Ca3Mn2O7 UNDER HIGH PRESSURE

2001 ◽  
Vol 15 (18) ◽  
pp. 2491-2497 ◽  
Author(s):  
J. L. ZHU ◽  
L. C. CHEN ◽  
R. C. YU ◽  
F. Y. LI ◽  
J. LIU ◽  
...  
Keyword(s):  
Crystal Structure ◽  
High Pressure ◽  
Diamond Anvil Cell ◽  
The Other ◽  
Layered Perovskite ◽  
X Ray Diffraction ◽  
Two Phase ◽  
X Ray ◽  
Diamond Anvil

In situ high pressure energy dispersive X-ray diffraction measurements on layered perovskite-like manganate Ca 3 Mn 2 O 7 under pressures up to 35 GPa have been performed by using diamond anvil cell with synchrotron radiation. The results show that the structure of layered perovskite-like manganate Ca 3 Mn 2 O 7 is unstable under pressure due to the easy compression of NaCl-type blocks. The structure of Ca 3 Mn 2 O 7 underwent two phase transitions under pressures in the range of 0~35 GPa. One was at about 1.3 GPa with the crystal structure changing from tetragonal to orthorhombic. The other was at about 9.5 GPa with the crystal structure changing from orthorhombic back to another tetragonal.

Fabrication of high aspect ratio nanoscale periodic structures by the soft X-ray interference lithography

2017 ◽  
Vol 170 ◽  
pp. 49-53 ◽  
Author(s):  
Jun Zhao ◽  
Yanqing Wu ◽  
Chaofan Xue ◽  
Shumin Yang ◽  
Liansheng Wang ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Periodic Structures ◽  
Interference Lithography ◽  
X Ray
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