Synthesis of BaCe0.9xZrxY0.1O3 nanopowders and the study of proton conductors fabricated on their basis by low-temperature spark plasma sintering

Simonenko, Tatiana L.; Калинина, М. В.; Симоненко, Н. П.; Simonenko, Elizaveta P.; Glumov, O. V.; Mel’nikova, N. A.; Murin, I. V.; Shichalin, O.O.; Папынов, Е. К.; Шилова, О. А.; Sevastyanov, V. G.; Кузнецов, Н. Т.

doi:10.1016/j.ijhydene.2019.05.231

Cited by 46 publications

(22 citation statements)

References 54 publications

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“…In this regard, recently, methods of fast densification (shrinkage) of powders have become very popular. One of the more discussed methods in this series is Spark Plasma Sintering (SPS) [ 13 , 14 , 15 , 16 , 17 ]. This technology provides a high level of control of the sintering process under constant pressure and high heating rates (10–1000 °C/min) [ 18 , 19 ].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Densification Behavior of Alumina during Spark Plasma Sintering

et al. 2022

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The article presents the results of the investigation of the mechanism of the densification behavior of alumina-based ceramics during spark plasma sintering. The role of the heating rates and additives were investigated. The first (initial) stage of sintering was investigated by the Young–Cutler model. The second (intermediate) stage of sintering was investigated as a process of plastic deformation of a porous body under external pressure. It was shown that, at the initial stage, the formation of necks between the particles is controlled by grain boundary diffusion (the activation energy is Qb ≈ 20 kTm). At this stage, accommodation of the shape of the alumina particles is also occurring (an increase in the packing density). The accommodation process facilitates the shrinkage of the powder, which is reflected in a decrease in the effective activation energy of shrinkage at low heating rates (10 °C/min) to Qb ≈ 17 kTm. At heating rates exceeding 10 °C/min, the intensity of the processes of accommodation of alumina particles turns out to be much slower than the existing diffusion processes of growth of necks between the alumina particles. It was shown that the grain boundary sliding mechanism that occurs in the second stage of sintering can play a decisive role under conditions of spark plasma sintering with a high heating rate. The found value of the activation energy at the second stage of sintering is also close to the activation energy of grain–boundary diffusion of alumina (Qb ≈ 20 kTm). The influences of the second phase particles of MgO, TiO2, and ZrO2 on densification behavior of alumina-based ceramics were investigated. Since at the first stage of sintering the densification relates with the formation of necks between the particles of alumina, the additives (0.5% vol) have no noticeable effect on this process. It was also shown that the second phase particles which are located at the grain boundaries of alumina are not involved in the slip process during the second sintering stage. Analysis shows that additives act only in the final (third) stage of spark plasma sintering of alumina.

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Section: Introductionmentioning

confidence: 99%

Investigation of the Densification Behavior of Alumina during Spark Plasma Sintering

et al. 2022

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“…This type of device allows one to convert directly the chemical energy of the redox reaction (between fuel and oxidizer, usually air) into electrical energy with high efficiency (up to 80% using cogeneration technology), use not only hydrogen but also various hydrocarbons as fuel (in particular, methane, propane, and natural gas) and biofuels, as well as significantly minimize carbon dioxide emissions into the atmosphere [7]. One of the key tasks in the development of modern energy-efficient SOFCs is to reduce their operating temperatures when creating medium-temperature fuel cells, which, in turn, will significantly expand the range of used construction materials, reduce the cost, and increase the reliability and service life of the device as a whole [8][9][10]. The solution of this problem requires the search for and development of new electrolyte and electrode materials that are not inferior in their performance characteristics to the traditionally used components in the formation of high-temperature SOFCs [11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Obtaining of La0.6Sr0.4Co0.2Fe0.8O3 – δ Nanopowder Using the Glycol–Citrate Method

Simonenko

Симоненко

Simonenko

et al. 2021

Russ. J. Inorg. Chem.

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The process of glycol-citrate synthesis of nanodispersed oxide with the composition La0.6Sr0.4Co0.2Fe0.8O3 – δ have been studied. The resulting nanopowder has been examined using a complex of modern methods of physicochemical analysis. The thermal behavior of the obtained powder in air in the temperature range of 20–1000°C has been investigated using synchronous TGA/DSC analysis. As a result, the optimal conditions for the sample heat treatment have been determined, to lead to the formation of a single-phase nanocrystalline oxide. Using X-ray diffraction analysis, IR spectroscopy, and energy-dispersive X-ray spectroscopy, it has been shown that the proposed synthesis method is convenient and effective for obtaining a highly dispersed powder of the specified composition with the target crystal structure. Scanning electron microscopy has been applied to analyze the morphology of the oxide nanopowder and determine the average particle and pore size.

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“…The synthesis of metastable materials with the preservation of this state is provided. The control of phase transformations is achieved by eliminating or initiating solid-phase chemical interactions during material processing [25][26][27][28][29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Ti-Cu Multiphase Alloy by Spark Plasma Sintering: Mechanical and Corrosion Properties

Shichalin

Sakhnevich

Buravlev

et al. 2022

Metals

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To study the material based on the binary system Ti + Cu (50% atm), samples were produced from powders of commercially pure metals and additionally ground in a ball mill (final size about 12 µm) by spark plasma sintering. The following intermetallic phases were obtained in the materials: CuTi2, TiCu, and Ti3Cu4. The materials have a hardness of 363 and 385 HV (800 and 900 °C), a microhardness of 393 and 397 µHV, a density of 4.24 and 5.23 kg/m3, and resistance to corrosion in acids (weight gain + 0.002% after 24 h of testing according to ISO 16151 for a sample with 900 °C—the best result in comparison with steel 308, AA2024, CuA110Fe3Mn2). The hardness value varies due to the presence of pure metal agglomerates. The relationship between the temperature of spark plasma sintering and the characteristics of the material (material parameters improve with increasing temperature, segregation is reduced) is revealed.

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Synthesis of BaCe0.9xZrxY0.1O3 nanopowders and the study of proton conductors fabricated on their basis by low-temperature spark plasma sintering

Cited by 46 publications

References 54 publications

Investigation of the Densification Behavior of Alumina during Spark Plasma Sintering

Investigation of the Densification Behavior of Alumina during Spark Plasma Sintering

Obtaining of La0.6Sr0.4Co0.2Fe0.8O3 – δ Nanopowder Using the Glycol–Citrate Method

Synthesis of Ti-Cu Multiphase Alloy by Spark Plasma Sintering: Mechanical and Corrosion Properties

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