Specific features of preparation of dense ceramic based on barium zirconate

Lyagaeva, Julia G.; Medvedev, Dmitry; Demin, A.; Yaroslavtseva, T. V.; Плаксин, С. В.; Поротникова, Н. М.

doi:10.1134/s1063782614100182

Cited by 22 publications

(12 citation statements)

References 28 publications

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“…This fact can be attributed mainly to the low activity of BaZrO 3 to the formation of a solid-state solution with BaCeO 3 , as noted in previously reported studies [15,16] The SEM studies support the inference about the more efficient sintering of the barium cerate-zirconate samples upon the introduction of copper oxide (Fig. 3).…”

Section: Resultssupporting

confidence: 83%

The modification of BaCe0.5Zr0.3Y0.2O3–δ with copper oxide: Effect on the structural and transport properties

et al. 2016

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The effect of the content of CuO additive on the sinterability, phase composition, microstructure, and electrical properties of BaCe 0.5 Zr 0.3 Y 0.2 O 3 -δ proton-conducting material is studied. Ceramic samples were produced by the citrate-nitrate synthesis method with the addition of 0, 0.25, 0.5, and 1% CuO. It is shown that the relative density of the samples containing 0.5 and 1% CuO is higher than 94% at a sintering temperature of 1450°C, whereas the relative density of the material is no higher than 85% at a lower content of the sintering additive. From the data of X-ray diffraction analysis and scanning electron microscopy, it is established that the introduction of a small CuO content (0.25%) is inadequate for single-phase and highdense ceramics to be formed. The conductivity and scanning electron microscopy data show that the sample with BaCe 0.5 Zr 0.3 Y 0.2 O 3 -δ + 0.5% CuO composition possesses high total and ionic conductivities as well as a high degree of microstructural stability after hydrogen reduction of the ceramics. The citrate-nitrate method modified by the introduction of a small CuO content can be recommended for the production of single-phase, gas-tight, and high-conductivity electrolytes based on both BaCeO 3 and BaZrO 3 .

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Section: Resultssupporting

confidence: 83%

The modification of BaCe0.5Zr0.3Y0.2O3–δ with copper oxide: Effect on the structural and transport properties

et al. 2016

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“…For example, for materials based on BaCeO 3 , the sintering temperature and soaking time are within 1400-1675°С and 10-120 h, respectively (Table 1, [21][22][23][24][25][26][27][28]). The production of gastight materials derived from BaZrO 3 requires even higher sinter ing temperatures [29][30][31][32]. It is evident that the presented data can be compared with each other only con ditionally because the properties of the ceramic product are strongly dependent not only on temperature conditions but also on the properties of initial powders (average particle size, content and type of uncon trolled admixtures).…”

Section: Solid State Methodsmentioning

confidence: 95%

Formation of dense electrolytes based on BaCeO3 and BaZrO3 for application in solid oxide fuel cells: The role of solid-state reactive sintering

2015

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Methods of synthesis and formation of a high dense ceramic prepared from barium cerate and zirconate, which is applied as electrolyte in solid oxide fuel cells, are considered in the present work. The main attention is devoted to the relatively new strategy of solid state reactive sintering method, which consists in the introduction of small amounts of sintering additives to initial precur sors. Analysis of published data on the effect of sintering additives on the physicochemical and trans port properties of proton conducting electrolytes is carried out. Fig. 4. The microstructure of (a) BaCe 0.9 Gd 0.1 O 3 -δ ceramic samples sintered at 1600°С for 3 h and (b) BaCe 0.89 Gd 0.1 Cu 0.01 O 3 -δ sintered at 1450°С for 3 h [69].

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“…As temperature decreases, some of ABO 3 perovskites, like SrTiO 3 and BaZrO 3 , stay in its high-temperature cubic phase, while other ABO 3 perovskites, such as CaTiO 3 , PbTiO 3 , BaTiO 3 , CaZrO 3 , SrZrO 3 and PbZrO 3 , exhibit different phase transitions. The neutral (001) as well as polar and charged (011) surfaces of the ABO 3 perovskites are both of fundamental interest for basic research, and also very important for practical applications, for example, numerous microelectronic, catalytic, and other high-technology applications as well as they are frequently used as substrates for growth of other materials such as cuprate superconductors [28][29][30][31][32][33][34].…”

Section: Introductionmentioning

confidence: 99%

Ab initio calculations of CaZrO3 (011) surfaces: systematic trends in polar (011) surface calculations of ABO3 perovskites

et al. 2019

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By means of the CRYSTAL computer program package, first-principles calculations of polar ZrO-, Ca-and O-terminated CaZrO 3 (011) surfaces were performed. Our calculation results for polar CaZrO 3 (011) surfaces are compared with the previous ab initio calculation results for ABO 3 perovskite (011) and ( 001) surfaces. From the results of our hybrid B3LYP calculations, all upperlayer atoms on the ZrO-, Ca-and O-terminated CaZrO 3 (011) surfaces relax inwards. The only exception from this systematic trend is outward relaxation of the oxygen atom on the ZrO-terminated CaZrO 3 (011) surface. Different ZrO, Ca and O terminations of the CaZrO 3 (011) surface lead to a quite different surface energies of 3.46, 1.49, and 2.08 eV. Our calculations predict a considerable increase in the Zr-O chemical bond covalency near the CaZrO 3 (011) surface, both in the directions perpendicular to the surface (0.240e) as well as in the plane (0.138e), as compared to the CaZrO 3 (001) surface (0.102e) and to the bulk (0.086e). Such increase in the B-O chemical bond population from the bulk towards the (001) and especially (011) surfaces is a systematic trend in all our eight calculated ABO 3 perovskites.

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Specific features of preparation of dense ceramic based on barium zirconate

Cited by 22 publications

References 28 publications

The modification of BaCe0.5Zr0.3Y0.2O3–δ with copper oxide: Effect on the structural and transport properties

The modification of BaCe0.5Zr0.3Y0.2O3–δ with copper oxide: Effect on the structural and transport properties

Formation of dense electrolytes based on BaCeO3 and BaZrO3 for application in solid oxide fuel cells: The role of solid-state reactive sintering

Ab initio calculations of CaZrO3 (011) surfaces: systematic trends in polar (011) surface calculations of ABO3 perovskites

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