Effects of chemical composition on structure and dielectric constants of Sr x Ca (1-x) TiO 3 synthesized by solution combustion technique

2018 ◽  
Vol 5 (7) ◽  
pp. 14992-14997 ◽  
Author(s):  
Oratai Jongprateep ◽  
Nicha Sato ◽  
Sansanee Boonsalee ◽  
JaeHwan Pee
Keyword(s):  
Chemical Composition ◽  
Dielectric Constants ◽  
Solution Combustion ◽  
Combustion Technique

Effects of Sn Concentration on Chemical Composition, Microstructure and Photocatalytic Activity of Nanoparticulate Sn-Doped TiO2 Powders Synthesized by Solution Combustion Technique

2018 ◽  
Vol 766 ◽  
pp. 191-196
Author(s):  
Oratai Jongprateep ◽  
Kornkamon Meesombad ◽  
Ratchatee Techapiesancharoenkij ◽  
Krissada Surawathanawises ◽  
Ratiporn Munprom
Keyword(s):  
Titanium Dioxide ◽  
Chemical Composition ◽  
Band Gap ◽  
Band Gap Energy ◽  
Solution Combustion ◽  
Gap Energy ◽  
Titanium Dioxide Powder ◽  
Dioxide Powder ◽  
Photocatalytic Activities ◽  
Combustion Technique

Utilization of photocatalytic properties of materials can be perceived through a wide range of applications, such as anti-bacterial, water treatment, and self-cleaning materials. It has been established that doping can result in alteration of photocatalytic activities. This study aimed at studying effects of tin concentration on chemical composition, microstructure, band gap energy, and photocatalytic activities of tin-doped titanium dioxide powder synthesized by solution combustion technique. Experimental results revealed that concentration of tin significantly influenced chemical composition of the powders. A semi-quantitative analysis indicated that tin oxide secondary phase increased from 11 to 23 wt%, as the Sn increased from 2.5 to 10 mol%, respectively. Tin concentration, nevertheless, did not significantly influence microstructure of the powders. All powders had average particle size ranging from 13.1 to 13.4 nm, which agglomerated into clusters with average sizes ranging from 103 to 140 nm. A slight increase of band gap energy was observed at higher tin concentration. The most prominent photocatalytic activities, determined from decomposition of methylene blue, was found in the titanium dioxide powder with 2.5 mol% Sn.

Microstructures and Dielectric Constants of Ba0.05SrxCa0.95-xTiO3 (x=0, 0.225, 0.475, 0.725 and 0.95) Synthesized by the Solution Combustion Technique

2018 ◽  
Vol 766 ◽  
pp. 197-204
Author(s):  
Oratai Jongprateep ◽  
Nicha Sato ◽  
Sansanee Boonsalee ◽  
Jae Hwan Pee
Keyword(s):  
Dielectric Constant ◽  
Fine Particles ◽  
Dielectric Material ◽  
Grain Morphology ◽  
Calcium Titanate ◽  
Dielectric Constants ◽  
Solution Combustion ◽  
Strontium Content ◽  
Barium Strontium ◽  
Combustion Technique

Barium strontium calcium titanate is a dielectric material exploited in fabrication of electronic devices such as capacitors, signal filters and satellite components. Dielectric properties can be enhanced through compositional and microstructural control. This study, therefore, aimed at synthesizing barium strontium calcium titanate (Ba0.05SrxCa0.95-xTiO3, where x = 0, 0.225, 0.475, 0.725 and 0.95) powders by a solution combustion technique. The powders were pressed, sintered at 1450°C and tested for their properties. Experimental results revealed that strontium content did not significantly influence chemical composition, particle sizes and density. All powders exhibited a single phase corresponding to Ba0.05SrxCa0.95-xTiO3with fine particles with the average size smaller than 0.4 micrometer. All sintered samples had density higher than 95% of theoretical density. On the contrary, the results indicated that strontium content affected grain size, grain morphology and dielectric constant of the sintered samples. The highest dielectric constant of 531 (at 1 MHz) was achieved in the Ba0.05Sr0.225Ca0.725TiO3. Dielectric constant was discussed with respect to microstructure.

Effects of Ca Addition on Chemical Composition, Microstructure and Dielectric Properties of BaTiO3

2014 ◽  
Vol 575 ◽  
pp. 231-237 ◽  
Author(s):  
Oratai Jongprateep ◽  
Tunchanoke Khongnakhon ◽  
Pongsakorn Jantaratana ◽  
Sansanee Rugthaicharoencheep
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Chemical Composition ◽  
Barium Titanate ◽  
High Energy ◽  
Dielectric Constants ◽  
High Energy Density ◽  
Composition Analysis ◽  
Secondary Phases ◽  
Solution Combustion

Owing to its high dielectric constant, barium titanate is a material commonly employed in fabrication of high energy density capacitors. Dielectric properties required for practical applications can be attained in barium titanate with desired chemical composition and microstructure. This study, therefore, aims at examining effects of additive contents on formation of secondary phases, microstructure and dielectric properties of BaTiO3 and BaTiO3 with 20-40 at% Ca. Chemical composition analysis revealed that single-phase BaTiO3 powder could be attained by the solution combustion technique. However, the powder with high Ca content exhibited large quantities of secondary phases. Dielectric property measurements of the uniaxially pressed powders indicated that dielectric constants could be enhanced with low Ca content. On the contrary, dielectric constant significantly degraded with high Ca content. This was attributed to formation of large quantities of secondary phases, coarse grain size and low density. Values of dielectric loss of all materials were lower than 1%.

scholarly journals Synthesis of Pr0.70Sr0.30MnO3δ and Nd0.70Sr0.30MnO3δ powders by solution-combustion technique

2011 ◽  
Vol 14 (2) ◽  
pp. 161-165 ◽  
Author(s):  
Reinaldo Azevedo Vargas ◽  
Everton Bonturim ◽  
Rubens Chiba ◽  
Marco Andreoli ◽  
Emília Satoshi Miymaru Seo
Keyword(s):  
Solution Combustion ◽  
Combustion Technique

Magnetic study of GdxBi1-xFeO3 multiferroics synthesized by solution combustion technique

2018 ◽  
Author(s):  
Arminder Kaur ◽  
Shivani Negi ◽  
Somnath ◽  
Arun Kumar ◽  
S. K. Sharma ◽  
...  
Keyword(s):  
Magnetic Study ◽  
Solution Combustion ◽  
Combustion Technique

Effects of Dissolving Agents on Particle Size Reduction of Titanium Dioxide Synthesized by Solution Combustion Technique

2016 ◽  
Vol 690 ◽  
pp. 236-239
Author(s):  
Oratai Jongprateep ◽  
Rachata Puranasamriddhi
Keyword(s):  
Particle Size ◽  
Titanium Dioxide ◽  
Sulfuric Acid ◽  
Nitric Acid ◽  
Average Particle Size ◽  
Average Particle ◽  
Particle Sizes ◽  
Solution Combustion ◽  
Initial Reagent ◽  
Combustion Technique

High photocatalytic activity of nanoparticulate titanium dioxide has attracted worldwide attention. Synthesis techniques of the nanoparticles, however, often require high energy supply or costly initial reagents. Solution combustion technique is an energy-effective technique capable of synthesizing nanosized titanium powders. This research aimed at utilizing a less expensive initial reagent in synthesis of nanoparticulate titanium dioxide by the solution combustion technique. The research also examined effects of dissolving agents on chemical composition and particle sizes of the synthesized powders. A low-cost initial reagent, titanium dioxide with average particle size of 154 nanometers, was dissolved in sulfuric acid or dispersed in nitric acid prior to the combustion. Experimental results revealed that the pure anatase phase titanium dioxide was successfully obtained in powders prepared from both sulfuric acid and nitric acid. The average particle size of the powder prepared from sulfuric acid was 77 nanometers, while that of the powder prepared from nitric acid was 117 nanometers. The difference in particle sizes was attributed to solubility of the initial reagent in the acid. Complete solution of initial reagent in sulfuric acid was the main factor attributed to finer particle size.

Synthesis of Lithium Orthosilicate by Solution Combustion Technique and Its Microwave Sintering

2012 ◽  
Vol 71 (4) ◽  
pp. 229-231 ◽  
Author(s):  
J. Gorinta ◽  
A. Choudhary ◽  
S. Bhattacharyya ◽  
P. Chaudhuri ◽  
R. Mazumder
Keyword(s):  
Microwave Sintering ◽  
Solution Combustion ◽  
Lithium Orthosilicate ◽  
Combustion Technique
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