Effects of Mg addition and sintering temperatures on chemical compositions, microstructures, densities and dielectric properties of strontium titanate

Jongprateep, Oratai; Palomas, Jednupong

doi:10.1016/j.ceramint.2015.03.192

Cited by 9 publications

(5 citation statements)

References 26 publications

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“…X-ray diffraction (XRD; X'Pert, Philips, PANalytical B.V., Almelo, Netherlands) was performed for phase identification via 2θ scanning from 20 • to 80 • with a step size of 0.02 • . Moreover, the XRD pattern was used to examine the secondary phase based on Klug's equation [69,70]:…”

Section: Characterizationmentioning

confidence: 99%

Electrocatalytic Properties of a BaTiO3/MWCNT Composite for Citric Acid Detection

et al. 2022

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Although barium titanate (BaTiO3) shows prominent dielectric properties for fabricating electronic devices, its utilization in electrochemical applications is limited. Thus, this study examined the potential of a BaTiO3-based composite in the detection of a food additive, i.e., citric acid. First, a submicron-scale BaTiO3 powder was synthesized using the solution combustion method. Then, a BaTiO3/multiwalled carbon nanotube (MWCNT) composite was hydrothermally synthesized at BaTiO3:MWCNT mass ratios of 1:1 and 2:1. This composite was used as a working electrode in a nonenzymatic sensor to evaluate its electrocatalytic activity. Cyclic voltammetric measurements revealed that the BaTiO3/MWCNT composite (2:1) exhibited the highest electrocatalytic activity. Reduction reactions were observed at applied voltages of approximately 0.02 and −0.67 V, whereas oxidation reactions were detected at −0.65 and 0.47 V. With acceptable sensitivity, decent selectivity, and fair stability, the BaTiO3/MWCNT composite (2:1) showed good potential for citric acid detection.

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Section: Characterizationmentioning

confidence: 99%

Electrocatalytic Properties of a BaTiO3/MWCNT Composite for Citric Acid Detection

et al. 2022

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“…Moderate to high Mg doping however has been reported to contribute to grain refinement which has been attributed to the dopants or compounds formed that diffuse to the grain boundary area and act as pinning agents that thus inhibit grain boundary mobility. As a result, dielectric ceramic grain size is reduced [15][16].…”

Section: Effects Of Mg Concentration On Grain Sizes Of Samplesmentioning

confidence: 99%

Chemical Composition-Microstructure-Dielectric Constant Relations of Mg-Doped Calcium Titanate Synthesized by Solid State Reaction Technique

Jongprateep

Sato

Palomas

et al. 2017

KEM

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It has been generally accepted that doping of dielectric materials could significantly contribute to compositional and microstructural evolution, which consequently lead to alteration in dielectric properties. In this study, the effects of adding magnesium (Mg) at 5,10 and 20at% on the chemical composition, microstructure and dielectric constant of calcium titanate (CaTiO3) synthesized by solid state reaction was assessed. Chemical composition analysis using an X-ray diffraction technique CaTiO3 doped with 5 at% Mg has been found to contain a single phase whereas samples doped with 10 and 20 at% Mg both exhibited apparent secondary phase (MgO). Microstructural examination however, revealed that no significant variation in particle size, grain size and density were evident among the samples of different Mg contents. Average dielectric constants obtained from the entire samples ranged from 245.9 to 387.6 (at 1 MHz) and the sample with the highest dielectric constant was that doped with 5 at% Mg. Enhancement of dielectric constant in the samples with the lowest level of Mg doping has been attributed largely to the homogeneity of its chemical composition.

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“…Since effective powder synthesis process results in controlled particle size of the powders and microstructure of dielectric specimens, synthesis technique, therefore, needs to be monitored [11][12][13][14]. Perovskite oxides, specifically barium strontium calcium titanate powders, can be synthesized by several routes, such as sol-gel, solid state reactions, hydrothermal and solution combustion synthesis.…”

Section: Introductionmentioning

confidence: 99%

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

Jongprateep

Sato

Boonsalee³

et al. 2018

KEM

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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.

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Effects of Mg addition and sintering temperatures on chemical compositions, microstructures, densities and dielectric properties of strontium titanate

Cited by 9 publications

References 26 publications

Electrocatalytic Properties of a BaTiO3/MWCNT Composite for Citric Acid Detection

Electrocatalytic Properties of a BaTiO3/MWCNT Composite for Citric Acid Detection

Chemical Composition-Microstructure-Dielectric Constant Relations of Mg-Doped Calcium Titanate Synthesized by Solid State Reaction Technique

Microstructures and Dielectric Constants of Ba<sub>0.05</sub>Sr<sub>x</sub>Ca<sub>0.95-x</sub>TiO<sub>3</sub> (x=0, 0.225, 0.475, 0.725 and 0.95) Synthesized by the Solution Combustion Technique

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