Study of the mechanisms of the t-ZrO2 → c-ZrO2 type polymorphic transformations in ceramics as a result of irradiation with heavy Xe22+ ions

Alin, M.; Kozlovskiy, Artem L.; Здоровец, М. В.; Углов, В.В.

doi:10.1016/j.solidstatesciences.2021.106791

Cited by 20 publications

(21 citation statements)

References 23 publications

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“…presented X-ray diffraction patterns was not established, which indicates the absence of processes of initialization of polymorphic transformations and phase transformations in the structure of ceramics under the action of irradiation in the entire range of radiation doses and accumulated radiation damage. The absence of such changes indicates an increased resistance of the synthesized ceramics to changes characteristic of ceramics based on zirconium dioxide [29,30] associated with polymorphic transformations of the t-ZrO2 → c-ZrO2 type. At low irradiation fluences of 10 14 -10 16 ion/cm 2 , the main changes in diffraction reflections (according to the detailed representation of the change in the shape and position of the diffraction reflection at 2θ = 29-30°) are associated with a slight decrease in the intensity of reflections, and at a fluence above 10 15 ion/cm 2 , a small shift to the region of small angles, which indicates the initialization of the radiation damage accumulation stage and its deformation effect on crystal structure distortions.…”

Section: Resultsmentioning

confidence: 99%

“…Interest in this topic consists in the fact that, unlike metals, the processes of radiation damage and their accumulation in dielectric ceramics are currently poorly understood, and there is currently no general theory that describes the mechanisms and kinetics of radiation damage. For example, several works [29,30] showed that the processes of radiation damage in ZrO 2 ceramics could lead to the initialization of polymorphic transformation processes, which are accompanied by a decrease in strength and thermal characteristics. At the same time, one of the ways to combat these processes is the stabilization of zirconium ceramics with yttrium or cerium, the addition of which leads to an increase in resistance to radiation damage [31][32][33].…”

Section: Introductionmentioning

confidence: 99%

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Study of Radiation-Induced Damage Processes in CeZrO4–YZrO3 Ceramics Caused by Helium Irradiation

et al. 2022

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Composite oxide ceramics CeZrO4–YZrO3 obtained by mechanochemical synthesis were chosen as objects of study. The most dangerous type of radiation defect in structural materials is associated with helium accumulation in the structure of the near-surface layer. This can lead to the destruction and swelling of the material, resulting in a decrease in its strength and thermal characteristics. During the studies, it was found that the most significant structural changes (deformation of the crystal lattice, the magnitude of microdistortions of the crystal lattice) are observed with irradiation fluence above 5×1016 ion/cm2, while the nature of the changes is exponential. X-ray diffraction analysis found that the nature of the crystal structure deformation has a pronounced type of stretching due to the accumulation of implanted helium and its subsequent agglomeration. A comparative analysis with data on microdistortions of the crystal lattice and the values of microhardness and softening of ZrO2 and CeO2 showed that two-phase ceramics of the cubic type CeZrO4-YZrO3 are more resistant to radiation-induced degradation than single-phase ZrO2 and CeO2. Results of strength and thermophysical characteristics showed that the presence of two phases increases resistance to destruction and disorder, leading to a decrease in strength and thermal conductivity.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study of Radiation-Induced Damage Processes in CeZrO4–YZrO3 Ceramics Caused by Helium Irradiation

et al. 2022

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“…According to L. Desgranges et al [ 52 ], displacement of X-ray diffraction spectra was observed in a sample of B 4 C boron carbide irradiated with thermal neutrons. Peak displacement and decrease in intensity are characterized by the deviation of atoms from the coordinates of the crystal lattice, i.e., formation of defect cascade and the degradation or amorphization of the crystal structure under the influence of high-energy ion streams [ 53 , 54 ]. The crystallite size, determined with help of the Scherrer equation, is shown in Table 1 for the unirradiated and irradiated B 4 C boron carbide sample under 167 MeV energy 132 Xe 26+ SHIs at 3.83 × 10 14 ion/cm 2 .…”

Section: Swift Heavy Ion Irradiation: X-ray Diffractionmentioning

confidence: 99%

Modeling and X-ray Analysis of Defect Nanoclusters Formation in B4C under Ion Irradiation

et al. 2022

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In the presented work, B4C was irradiated with xenon swift heavy ions at the energy of 167 MeV. The irradiation of the substrate was done at room temperature to a fluence of 3.83 × 1014 ion/cm2. The samples were then analyzed with the X-ray diffraction technique to study the structural modification, as it can probe the region of penetration of xenon atoms due to the low atomic number of the two elements involved in the material under study. The nano-cluster formation under ion irradiation was observed. Positron lifetime (PLT) calculations of the secondary point defects forming nanoclusters and introduced into the B4C substrate by hydrogen and helium implantation were also carried out with the Multigrid instead of the K-spAce (MIKA) simulation package. The X-ray diffraction results confirmed that the sample was B4C and it had a rhombohedral crystal structure. The X-ray diffraction indicated an increase in the lattice parameter due to the Swift heavy ion (SHI) irradiation. In B12-CCC, the difference between τ with the saturation of H or He in the defect is nearly 20 ps. Under the same conditions with B11C-CBC, there is approximately twice the value for the same deviation.

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“…Among the variety of oxide ceramics, great interest is shown in zirconium dioxide (ZrO 2 ), the distinctive features of which are high chemical stability, mechanical and strength properties, as well as high compatibility, both with heat carriers and materials of fuel element shells [16,17]. However, despite the great prospects for the use of ZrO 2 ceramics, there is one significant drawback, which lies in polymorphic phase transformations resulting both from elevated temperatures and from irradiation [18,19]. To eliminate this drawback, as a rule, various dopants are used, the addition of which leads to an increase in stability for polymorphic transformations as well as an increase in the strength and mechanical properties [20].…”

Section: Introductionmentioning

confidence: 99%

Research of Structural, Strength and Thermal Properties of ZrO2—CeO2 Ceramics Doped with Yttrium

et al. 2022

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In this work, using a mechanochemical solid-phase synthesis method, ZrO2—CeO2 ceramics doped with yttrium were obtained, which have great prospects for use as a basis for dispersed nuclear fuel materials or inert nuclear fuel matrices. The purpose of this work was to study the formation of the ZrO2—CeO2 phase composition, depending on the concentration of yttrium dopant, as well as to study their structural and strength properties. The relevance of this study is in obtaining new data on the properties of composite ceramics based on oxides having a cermet structure, as well as the effect of doping with yttrium on increasing the resistance of ceramics to deformation and thermal properties. During the studies, the dynamics of the phase transformations depending on the concentration of the dopant, as well as changes in the structural characteristics and dislocation density, were established. It was found that at a dopant concentration of 0.25 mol, the main phase in the structure was Ce3ZrO8–triclinic P1 (1), the formation of which led to an increase in the mechanical and strength properties of the ceramics as well as a 1.5-fold increase in the thermal conductivity coefficient.

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Study of the mechanisms of the t-ZrO2 → c-ZrO2 type polymorphic transformations in ceramics as a result of irradiation with heavy Xe22+ ions

Cited by 20 publications

References 23 publications

Study of Radiation-Induced Damage Processes in CeZrO4–YZrO3 Ceramics Caused by Helium Irradiation

Study of Radiation-Induced Damage Processes in CeZrO4–YZrO3 Ceramics Caused by Helium Irradiation

Modeling and X-ray Analysis of Defect Nanoclusters Formation in B4C under Ion Irradiation

Research of Structural, Strength and Thermal Properties of ZrO2—CeO2 Ceramics Doped with Yttrium

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