The influence of mechanical activation on the electrical properties of Ba0.77Sr0.23TiO3 ceramics

Kosanović, Darko; Živojinović, Jelena; Obradović, Nina; Pavlović, Vera P.; Pavlović, Vladimir B.; Peleš, Adriana; Ristić, M.M.

doi:10.1016/j.ceramint.2014.04.023

Cited by 8 publications

(3 citation statements)

References 4 publications

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“…Herein we present a study of the influence of the chemical composition of BST powder on its microstructural properties and sintering kinetics, as a part of an a broader study of the influence of composition and microstructural parameters on sintering behavior and functional properties of BST [34][35][36].…”

Section: Introductionmentioning

confidence: 99%

Effect of chemical composition on microstructural properties and sintering kinetics of (Ba,Sr)TiO3 powders

et al. 2018

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Barium strontium titanate powders with different Ba:Sr ratios were investigated to determine the influence of the initial composition of powder mixture on microstructural properties and sintering kinetics. It was determined that BaCO 3 and SrCO 3 react differently to mixing, resulting in Ba 0.5 Sr 0.5 CO 3 in the sample with 80% Ba and different contents of Ba 1-x Sr x TiO 3 in samples with 50% and 20% Ba. In addition, the morphology is also different, with higher Sr content leading to larger particles size and less agglomeration. The different chemical content of the initial powder mixture also has a marked impact on the sintering process: the onset of sintering shifts towards higher temperature with higher Sr content, while the average apparent activation energy of sintering is the highest for the sample with 80% Ba and the lowest for the mixture with 50% Ba. In addition, hexagonal-to-cubic phase transformation was observed in parallel with the sintering process, where the position of the phase transition shifts to lower temperatures with an increase in Sr content. This is consistent with the behavior of low-temperature phase transitions of BST. The phase transition was not observed in sintered samples, suggesting that there is a size-dependence of the phase transition temperature.

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Section: Introductionmentioning

confidence: 99%

Effect of chemical composition on microstructural properties and sintering kinetics of (Ba,Sr)TiO3 powders

et al. 2018

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“…Importantly, Fe (110) and BaTiO 3 (100) planes are a relatively close match in terms of lattice constants (a mismatch is only about 1.4%), which allows layer-by-layer epitaxial growth of Fe/BaTiO 3 multi-layers with no misfit dislocations. Mechanical activation is a wellestablished preparation route for various titanate based based electroceramics [11][12][13][14][15][16][17]. At higher Fe:Ba ratios, barium hexaferrite BaFe 12 O 19 , an M type hexagonal ferrite, is usually formed, which, like other ferrite materials, has been used as a permanent magnet for electronic and microwave applications [18][19][20][21][22], due to its large uniaxial magnetic anisotropy [23].…”

Section: Introductionmentioning

confidence: 99%

Influence of mechanical activation on functional properties of barium hexaferrite ceramics

Kosanović

Blagojević

Maricic

et al. 2018

Ceramics International

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Barium hexaferrite ceramics were prepared using mechanically activated mixtures of iron and barium titanate. The 60:40 mass% Fe:BaTiO 3 powder mixtures were mechanically activated for different times (100-240 min) and sintered at 1100 and 1200 o C in order to determine the influence of mechanical activation of the precursor on the magnetic and dielectric properties of the resulting barium hexaferrite ceramics. The final product contained 84-89 mass% of Ba 2 Fe 22.46 O 38 Ti 1.54 phase, with higher content corresponding to longer mechanical activation of the precursor. XRD and Raman measurements indicated that the remainder of the sample consists of leftover BaTiO 3 and hematite, which was formed by the oxidation of iron during mechanical activation and sintering in air. Magnetic properties of samples sintered at 1200 o C are superior to those sintered at 1100 o C, which can be attributed to higher Ba 2 Fe 22.46 O 38 Ti 1.54 phase content. The position of the Curie temperature in 350-420 o C temperature region is consistent with 0.8:1 ratio of Ti to Ba. Maximum magnetization was observed for samples activated for 120 min. Dielectric properties of samples sintered at 1200 o C showed a dependence on frequency, with a significant drop in relative permittivity with an increase in

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“…Recently, it was shown that the influence of thermal treatments for the Fe-implanted BTO films was followed with decrease of coercivity and enhancement of magnetization [17,18]. Mechanical activation is well established preparation route for barium-titanate [19] and magnesium titanate (MTO) [20] based electroceramics.…”

Section: Introductionmentioning

confidence: 99%

The influence of mechanochemical activation and thermal treatment on magnetic properties of the BaTiO3-FexOy powder mixture

Ristanović¹,

Kalezić-Glišović²,

Mitrović³

et al. 2015

SCI SINTER

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Powder mixture of 50 mass % of barium titanate (BaTiO3) and 50 mass % of iron (Fe) was prepared by solid-state reaction technique, i.e. ball milled in air for 60 min, 80 min, 100 min, 120 min and 150 min. During mechanochemical activation it was observed the iron powder transitsion to iron oxides. Depending on the activation time the content of iron oxides FeO, Fe2O3 and Fe3O4 varies. Simultaneously, with the content change of the activated system, magnetic properties change as well. The XRD analysis of milled samples shown that as the activation time increase, the iron oxide percentage increases to, whereby the percentage of BaTiO3 in a total sample mass decreases. The percentage of iron oxides and BaTiO3 in annealed samples changes depending on annealing temperature. The thermomagnetic measurements performed by Faraday method shown that the powder mixture milled for 100 minutes exhibit maximum magnetization prior to annealing. The increase of magnetization maximum was observed after annealing at 540?C with all milled samples, and at room temperature it has enhancement from 10 % to 22 % depending on the activation time. The samples milled for 100 min and 150 min and then sintered at 1200w?C exhibit magnetoelectric properties. [Projekat Ministarstva nauke Republike Srbije, br. 172057]

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The influence of mechanical activation on the electrical properties of Ba0.77Sr0.23TiO3 ceramics

Cited by 8 publications

References 4 publications

Effect of chemical composition on microstructural properties and sintering kinetics of (Ba,Sr)TiO3 powders

Effect of chemical composition on microstructural properties and sintering kinetics of (Ba,Sr)TiO3 powders

Influence of mechanical activation on functional properties of barium hexaferrite ceramics

The influence of mechanochemical activation and thermal treatment on magnetic properties of the BaTiO3-FexOy powder mixture

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