Additive controlled crystallization of barium titanate powders and their application for thin-film ceramic production: Part I. Powder Synthesis

2001 ◽  
Vol 16 (7) ◽  
pp. 1901-1910 ◽  
Author(s):  
B. Grohe ◽  
G. Miehe ◽  
G. Wegner
Keyword(s):  
Thin Film ◽  
Barium Titanate ◽  
Crystallization Process ◽  
Ostwald Ripening ◽  
Ceramic Production ◽  
Size Distributions ◽  
Particle Size Distributions ◽  
Powder Synthesis ◽  
Controlled Crystallization ◽  
Production Part

Stoichiometric barium titanate (BaTiO3) was synthesized in aqueous solution with acetone and/or methanol as additives to control the crystallization process. Adjusted nano-sized particles and narrow particle size distributions were achieved at 60 °C with additive concentrations up to 243 ml/ l. The growth kinetics showed that the additives influence the nucleation of the BaTiO3 particles and tend to suppress Ostwald ripening.

Additive controlled crystallization of barium titanate powders and their application for thin-film ceramic production: Part II. From nano-sized powders to ceramic thin films

2001 ◽  
Vol 16 (7) ◽  
pp. 1911-1915 ◽  
Author(s):  
B. Grohe ◽  
G. Miehe ◽  
G. Wegner
Keyword(s):  
Thin Film ◽  
Dielectric Constant ◽  
Barium Titanate ◽  
Organic Medium ◽  
Ceramic Production ◽  
Ceramic Thin Films ◽  
Ceramic Films ◽  
Controlled Crystallization ◽  
Layered Ceramics ◽  
Production Part

Nano-sized barium titanate (BaTiO3) particles prepared by the sol-to-precipitate method in aqueous/organic medium served to obtain thin-layer ceramic films of the tetragonal electroactive phase. Poly(methacrylic acid) works efficiently to process the suspensions and to obtain green films. Sintering the green films under O2–Ar atmosphere gave thin-layered ceramics of a thickness of 0.5–1.0 mm with a dielectric constant of 3750 at 20 °C (1 kHz).

Three Dimensional Monte Carlo Simulation of Isotropic Coarsening of Particles in Liquid Phase

2007 ◽  
Vol 558-559 ◽  
pp. 1115-1120
Author(s):  
Suk Bin Lee ◽  
Anthony D. Rollett
Keyword(s):  
Particle Size ◽  
Monte Carlo ◽  
Liquid Phase ◽  
Ostwald Ripening ◽  
Monte Carlo Model ◽  
Liquid Phase Sintering ◽  
Three Dimensions ◽  
Average Particle ◽  
Size Distributions ◽  
Particle Size Distributions

Coarsening of particles during liquid phase sintering is known to be an example of Ostwald ripening. This coarsening process, in a fully wetting system, is simulated in three dimensions with a kinetic Monte Carlo model. The results from the simulation for microstructures, kinetics and particle size distributions are compared to available experimental findings. It is found that the average particle volume increases linearly with time and that the particle size distributions are consistent with those obtained experimentally, as in the W-Ni-Fe and Sn-Pb systems.

scholarly journals Ostwald Ripening of Platinum Nanoparticles Confined in a Carbon Nanotube/Silica-Templated Cylindrical Space

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Cintia Mateo-Mateo ◽  
Carmen Vázquez-Vázquez ◽  
Moisés Pérez-Lorenzo ◽  
Verónica Salgueiriño ◽  
Miguel A. Correa-Duarte
Keyword(s):  
Carbon Nanotube ◽  
Platinum Nanoparticles ◽  
Metallic Nanoparticles ◽  
Ostwald Ripening ◽  
Size Distributions ◽  
Confined Space ◽  
Sintering Process ◽  
Particle Size Distributions ◽  
Final Particle ◽  
Ostwald Ripening Mechanism

Sintering of nanoparticles mediated by an Ostwald ripening mechanism is generally assessed examining the final particle size distributions. Based on this methodology, a general approach for depositing platinum nanoparticles onto carbon nanotubes in solution has been employed in order to evaluate the sintering process of these metallic nanoparticles at increasing temperatures in a carbon nanotube/silica-templated confined space.

Composition Fluctuations in the Ostwald Ripening

2008 ◽  
Vol 277 ◽  
pp. 187-192
Author(s):  
G.V. Lutsenko ◽  
Andriy Gusak
Keyword(s):  
Computer Simulation ◽  
Particle Size ◽  
Large Volume ◽  
Ostwald Ripening ◽  
Volume Fraction ◽  
Size Distributions ◽  
Particle Size Distributions ◽  
Two Phase ◽  
Large Volume Fraction ◽  
Composition Fluctuations

The Ostwald ripening of a two-phase binary alloy has been considered for case of “large” volume fraction of precipitating phase. The approach is proposed in which the composition fluctuations into the vicinity of particles are considered. In this approach the evolution of particle size distributions is analyzed using the computer simulation.

Evidence of Ostwald ripening related recrystallization of diagenetic chlorites from reservoir rocks offshore Norway

Clay Minerals ◽  
1991 ◽  
Vol 26 (2) ◽  
pp. 169-178 ◽  
Author(s):  
J. S. Jahren
Keyword(s):  
Ostwald Ripening ◽  
Size Distributions ◽  
Particle Size Distributions ◽  
Temperature Dependent ◽  
X Ray ◽  
Reservoir Rocks ◽  
Transmission Electron ◽  
Crystal Core ◽  
Higher Temperature ◽  
Scanning Electron

AbstractChemical variations in individual chlorite crystals of diagenetic origin delineated by energy dispersive X-ray spectroscopy (EDS) in a transmission electron microscope (TEM) indicate a temperature dependent chemical zonation in each grain. Silicon decreases and Al increases with higher temperature resulting in a decreasing Si/Al ratio away from the crystal core reflecting the time and rate of the crystal growth. Chlorite particle-size distributions obtained by scanning electron microscopy (SEM) give steady state profiles which suggests that the chlorite growth is controlled by a grain coarsening process related to Ostwald ripening.

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