Formation mechanism of barium titanate nanocrystals under hydrothermal conditions

1997 ◽  
Vol 40 (5) ◽  
pp. 479-488 ◽  
Author(s):  
Weizhuo Zhong ◽  
Changtai Xia ◽  
Erwei Shi ◽  
Buguo Wang ◽  
Wenjun Li ◽  
...  
Keyword(s):  
Barium Titanate ◽  
Formation Mechanism ◽  
Hydrothermal Conditions

The formation mechanism of barium titanate thin film under hydrothermal conditions

1994 ◽  
Vol 9 (11) ◽  
pp. 2914-2918 ◽  
Author(s):  
E. Shi ◽  
C.R. Cho ◽  
M.S. Jang ◽  
S.Y. Jeong ◽  
H.J. Kim
Keyword(s):  
Thin Films ◽  
Reaction Time ◽  
Barium Titanate ◽  
Surface Morphology ◽  
Formation Mechanism ◽  
Processing Temperature ◽  
Component Ratio ◽  
Hydrothermal Conditions ◽  
Reaction Conditions ◽  
Higher Temperature

Barium titanate thin films were produced under the hydrothermal conditions, and their formation mechanism was investigated. The phase structure and surface morphology of the resultant films were directly dependent on the reaction conditions. The films that have a reaction time shorter than 8 h below the processing temperature of 150 °C in the 0.8 N Ba(OH)2 solution were composed of compounds with the component ratio m(Ba)/ m(Ti) < 1, and a flower-like surface morphology. With extended reaction time under the higher temperature, the films showed a multiphase structure and a mosaic or island-like surface morphology. In the case of 1.0 N, 1.5 N Ba(OH)2 solution, well-crystallized, monoperovskite BaTiO3 thin films having uniform, mirror-like, and visible-defectless surfaces were produced at a processing temperature of 180 °C after 24 h. The experimental results were explained by hypothesizing that the formation mechanism consists of a “dissolutions-crystallization process”.

Experimental assessment of the inhibition of reduction of Ca2+-doped barium titanate in a reducing atmosphere

1999 ◽  
Vol 14 (5) ◽  
pp. 1910-1915 ◽  
Author(s):  
Tsang-Tse Fang ◽  
Jyh-Tzong Shuei
Keyword(s):  
Barium Titanate ◽  
Formation Mechanism ◽  
Driving Force ◽  
Experimental Assessment ◽  
Reducing Atmosphere ◽  
Doped Barium Titanate

Several experiments have been conducted to assess the possible mechanisms for the inhibition of reduction of Ca2+-doped barium titanate in a reducing atmosphere. Three methods, i.e., conventional, semiwet, and citrate processes, have been used to prepare the powders. It was found that the formation mechanism would influence the occupation of Ca2+ in the B site. Moreover, it was concluded that Ca2+ occupation of the B site is the major cause for the inhibition of reduction of Ca2+-doped barium titanate. Ti deficiency would be the driving force for Ca2+ to occupy the B site.

Synthesis of TiO2-Based Nanotube on Ti Substrate by Hydrothermal Treatment

2007 ◽  
Vol 7 (2) ◽  
pp. 668-672 ◽  
Author(s):  
Bo Chi ◽  
Erick S. Victorio ◽  
Tetsuro Jin
Keyword(s):  
Aspect Ratio ◽  
Pore Size ◽  
Hydrothermal Treatment ◽  
Formation Mechanism ◽  
High Aspect Ratio ◽  
Hydrothermal Conditions ◽  
Titanate Nanotube ◽  
Naoh Solution ◽  
Nanofiber Film

TiO2-based titanate nanotube film was directly synthesized by hydrothermal treatment of Ti substrate in NaOH solution. The prepared high aspect ratio nanotubes have diameter of 10nm and pore size of 5 nm with length of several microns. The nanotubes show the same structure and component characteristics as the nanotubes prepared through hydrothermal treatment of TiO2. Other nanostructured titanate as oriented nanofiber film and translucent film were also prepared by adjusting the hydrothermal conditions. The formation mechanism of nanostructured titanate was discussed.

scholarly journals Geomimetics for green polymer synthesis: highly ordered polyimides via hydrothermal techniques

2014 ◽  
Vol 5 (12) ◽  
pp. 3771-3776 ◽  
Author(s):  
Bettina Baumgartner ◽  
Michael J. Bojdys ◽  
Miriam M. Unterlass
Keyword(s):  
Formation Mechanism ◽  
High Performance ◽  
Polymer Synthesis ◽  
Hydrothermal Crystallization ◽  
Hydrothermal Conditions ◽  
Ore Formation ◽  
High Performance Polymers ◽  
Green Polymer

We mimic a geological ore formation mechanism, so-called hydrothermal crystallization, to obtain highly crystalline high-performance polymers. After only 1 h under hydrothermal conditions, a fully condensed polyimide depicting microflower morphologies is obtained.

Synthesis, Characterization and Electrical Properties of Barium Titanate Films Fabricated by Hydrothermal Method

2008 ◽  
Vol 368-372 ◽  
pp. 47-49
Author(s):  
Jian Ling Zhao ◽  
Xiao Hui Wang ◽  
Long Tu Li ◽  
Xi Xin Wang ◽  
Yang Xian Li
Keyword(s):  
Dielectric Constant ◽  
Electrical Properties ◽  
Barium Titanate ◽  
Loss Tangent ◽  
Coercive Field ◽  
Remanent Polarization ◽  
Hydrothermal Conditions ◽  
Batio3 Film ◽  
Maximum Value ◽  
Dielectric Constant And Loss

BaTiO3 films with a thickness up to 3 μm were fabricated under the hydrothermal conditions. It was found that the crystallinity of BaTiO3 increases with the concentration of Ba(OH)2 solutions. Along with the increasing of time, the crystallinity of BaTiO3 increases, reaches the maximum value and then decreases. The measured values of remanent polarization (Pr) and coercive field (Ec) are 1.74μC/cm2 and 24KV/cm. The leakage of the films at 1V is 10-7A/cm2. The dielectric constant and loss tangent of hydrothermal derived BaTiO3 film at a frequency of 1 KHz were 600 and 0.2, respectively.

scholarly journals The Novel Formation of Barium Titanate Nanodendrites

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Chien-Jung Huang ◽  
Kan-Lin Chen ◽  
Pin-Hsiang Chiu ◽  
Po-Wen Sze ◽  
Yeong-Her Wang
Keyword(s):  
Barium Titanate ◽  
Oxalic Acid ◽  
Crystallite Size ◽  
Formation Mechanism ◽  
Titanium Tetrachloride ◽  
Barium Chloride ◽  
The Novel ◽  
Central Stem ◽  
Shape And Size

The barium titanate (BaTiO3) nanoparticles with novel dendrite-like structures have been successfully fabricated via a simple coprecipitation method, the so-called BaTiO3nanodendrites (BTNDs). This method was remarkable, fast, simple, and scalable. The growth solution is prepared by barium chloride (BaCl2), titanium tetrachloride (TiCl4), and oxalic acid. The shape and size of BaTiO3depend on the amount of added BaCl2solvent. To investigate the influence of amount of BaCl2on BTNDs, the amount of BaCl2was varied in the range from 3 to 6 mL. The role of BaCl2is found to have remarkable influence on the morphology, crystallite size, and formation of dendrite-like structures. The thickness and length of the central stem of BTND were ~300 nm and ~20 μm, respectively. The branchings were found to occur at irregular intervals along the main stem. Besides, the formation mechanism of BTND is proposed and discussed.

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