Thermal diffusivity characterization of europium zirconate, cerate and hafnate

Mikuśkiewicz, Marta; Moskal, G.; Migas, Damian; Stopyra, Michał

doi:10.1016/j.ceramint.2018.07.301

Cited by 12 publications

(6 citation statements)

References 26 publications

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“…The shape of diffusivity curve suggests that the dominating mechanism controlling the heat transfer in this temperature range is phonon scattering. Comparison between these results and the available literature data concerning RE 2 Ce 2 O 7 leads to the conclusion that thermal diffusivity of investigated Ce-Eu oxide is similar to Sm 2 Ce 2 O 7 obtained with similar method [13]. At temperature higher than 900°C the thermal diffusivity increases and reaches 0.70 mm 2 /s at 1400°C, which could be attributed to the increasing share of radiation in overall heat transfer at high temperature.…”

Section: Resultssupporting

confidence: 75%

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Archives of Metallurgy and Materials

Mikuśkiewicz¹,

Stopyra²,

Moskal³

2018

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In the present paper the structure and thermal properties of europium cerium oxides were investigated. The material for the research was obtained via solid state synthesis. The initial powders: ceria CeO 2 and europia Eu 2 O 3 were mixed in 1:1 mass ratio (non-stoichiometric proportion with the excess of CeO 2 ) and milled. The sintering process was performed using high temperature vacuum press at 1350°C. Calorimetric analysis was conducted both for initial powders and milled mixture. The structure, phase composition and thermal diffusivity of obtained material were investigated in as-sintered condition. It was revealed that the obtained material was multi-phase. Non-stoichiometric phases including Ce 0.5 Eu 0.5 O 1.75 with fluorite type structure and different lattice parameters were present. Thermal diffusivity decreased in the range from 25 to 900°C from 1.49 to 0.57 mm 2 /s and then increased to 0.70 mm 2 /s at 1400°C.

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Section: Resultssupporting

confidence: 75%

“…However, there are much less information about compounds from europia-ceria (Eu 2 O 3 -CeO 2 ) system [13,14]. Ceria is the only one among rare earth oxides which exhibit 4 + instead of 3 + oxidation state.…”

Section: Introductionmentioning

confidence: 99%

Archives of Metallurgy and Materials

Mikuśkiewicz¹,

Stopyra²,

Moskal³

2018

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“…Over the years, research has been conducted to determine the influence of various inorganic substances on the tribological properties of polymer composites. These include TiO 2 , TiC, Al 2 O 3 , ZnO, SiC, CuO, ZrO 2 , SiO 2 , Si 3 N 4 , CaCO, and ZrO 2 [ 26 , 27 , 28 , 29 ]. The various amounts of micro- and nano-scale particles (TiO 2 and CaSiO 3 ) were introduced into an epoxy polymer matrix for its reinforcement.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Zinc Waste Filler on the Tribological and Mechanical Properties of Silicone-Based Composites

et al. 2021

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Silicones are often used for various types of coatings, but due to their poor mechanical properties, they often require modification to meet specific requirements. At the same time, various production processes throughout the world generate different types of waste, the disposal of which is harmful to the environment. One possible solution is to use production waste as a filler. In this paper, the authors investigated how the use of metallurgical production waste products as fillers changed the mechanical properties of silicone composites prepared by casting. Composite samples were characterized using tensile tests, resilience, pin-on-disc, Schopper–Schlobach abrasion, hardness, and density measurements. Based on the obtained results, the authors assessed the effect of each of the fillers used in different weight proportions. The results showed that the silicone composite filled with 5 wt% zinc dust showed the lowest decrease in tensile strength and Young’s modulus, with a simultaneous significant reduction in abrasion compared with the reference sample. This research shows that zinc waste can be successfully introduced into a silicone matrix in cases where it is important to reduce abrasive wear.

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“…The other type of pyrochlore developed is europium zirconate [16]. Recently, the new concepts of pyrochlores have been considered: cerate and hafnate of europium [17] and samarium [18]. The other idea is to develop high-entropy zirconates [19,20].…”

Section: Introductionmentioning

confidence: 99%

The Influence of Reactive PS-PVD Process Parameters on the Microstructure and Thermal Properties of Yb2Zr2O7 Thermal Barrier Coating

et al. 2022

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Ytterbium zirconate (Yb2Zr2O7) is one of the most promising materials for yttria-stabilized zirconia (YSZ) replacement as a thermal barrier coating (TBCs) application. In the presented report, the experimental synthesis of Yb2Zr2O7 coating using novel Reactive Plasma Spray Physical Vapor Deposition (Reactive PS-PVD) is described. The obtained coating, irrespective of the power current (1800, 2000 and 2200 A), was characterized by a hybrid structure and a thickness of about 80–110 μm. The results of XRD phase analysis showed the formation of ytterbium zirconate in the coating but the presence of ytterbium and zirconium oxides was also detected. The oxides were not observed in calcinated powder. The decrease in thermal conductivity with power current increase was observed. It was the result of higher thickness and better columnar structure of the coating obtained using higher power current of the plasma torch.

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Thermal diffusivity characterization of europium zirconate, cerate and hafnate

Cited by 12 publications

References 26 publications

Archives of Metallurgy and Materials

Archives of Metallurgy and Materials

The Influence of Zinc Waste Filler on the Tribological and Mechanical Properties of Silicone-Based Composites

The Influence of Reactive PS-PVD Process Parameters on the Microstructure and Thermal Properties of Yb2Zr2O7 Thermal Barrier Coating

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