Study of the Mechanisms of Polymorphic Transformations in Zirconium Dioxide upon Doping with Magnesium Oxide, as Well as Establishing the Relationship between Structural Changes and Strength Properties

Kurakhmedov, Alisher E.; Morzabayev, Aidar K.; Tleubay, Islam; Berguzinov, Askhat; Kozlovskiy, Artem L.

doi:10.3390/ceramics6020070

Cited by 4 publications

(3 citation statements)

References 40 publications

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“…Based on the above, the key goal of this study is to study the effect of the ZrO 2 doping of MgO ceramics with different concentrations on the resistance to radiation damage when irradiated with ions. Variation in the MgO concentration, according to the data of previous studies [26], results in the initiation of the polymorphic phase transformation processes of the m-ZrO 2 → t-ZrO 2 and t-ZrO 2 → c-ZrO 2 types, as well as a rise in the resistance of ceramics to external influences (mechanical strength growth). Moreover, the study of the radiation damage processes, as well as methods for increasing the resistance to their accumulation, and subsequent structural disorder and reducing the strength and thermophysical parameters in oxide ceramics, constitutes a promising and topical research direction in the domain of radiation materials science and nuclear energy.…”

Section: Introductionmentioning

confidence: 87%

Study of the Effect of Variation in the Phase Composition of ZrO2/MgO Ceramics on the Resistance to Radiation Damage during Irradiation with Kr15+ Ions

Kurakhmedov,

Morzabayev,

Uglov

et al. 2023

J. Compos. Sci.

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Interest in the modification of zirconium-containing ceramics is rooted in their great prospects for application as materials for creating inert matrices of dispersed nuclear fuel, which can replace traditional fuel containing uranium dioxide, as well as increase the degree of its burnup. Moreover, among the variety of different types of ceramics offered, zirconium dioxide is the most promising, since it has higher thermal conductivity values compared to other types of ceramics, as well as low volumetric thermal expansion. Moreover, the key limitations in the application of these types of ceramics as materials for creating inert matrices are polymorphic transformations, which have a negative impact on changes in the properties of ceramics under external influences. The evaluation results of the impact of change in the ZrO2 ceramics’ phase composition on the radiation damage resistance when subjected to irradiation with heavy ions, comparable in energy to fission fragments, are presented. The objects of study were samples of ZrO2 ceramics doped with MgO, the variation in the concentration of which leads to an acceleration of the processes of polymorphic transformations during thermal sintering, as well as the formation of a ZrO2/MgO-type structure with inclusions in the form of MgO grains. The results of the irradiation effect on the stability of the crystal structure of ceramics to deformation swelling due to the accumulation of deformation inclusions showed that ceramics with a monoclinic structure type are the least stable, for which, in the case of high irradiation fluences, the accumulation of deformation distortions leads to polymorphic transformations of the m—ZrO2 → t—ZrO2 type. During the evaluation of the irradiation effect on the change in mechanical properties and the softening degree, it was found that phase transformations of the m—ZrO2 → t—ZrO2 and t—ZrO2 → c—ZrO2 types lead to an increase in crack resistance by 1.5–2.0 times. Meanwhile, the formation of a structure of the ZrO2/MgO type with inclusions in the form of MgO grains in the interboundary space results in a softening resistance growth by over 7-fold. During tests for determining thermophysical parameters, as well as maintaining stability to crystal structure thermal expansion during prolonged thermal exposure, it was found that phase transformations associated with polymorphic transformations of the t—ZrO2 → c—ZrO2 type led to the preservation of the stability of thermophysical properties, even in the case of high irradiation fluences.

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Section: Introductionmentioning

confidence: 87%

Study of the Effect of Variation in the Phase Composition of ZrO2/MgO Ceramics on the Resistance to Radiation Damage during Irradiation with Kr15+ Ions

Kurakhmedov,

Morzabayev,

Uglov

et al. 2023

J. Compos. Sci.

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“…The formation of the Zr 0.85 Ce 0.15 O 2 tetragonal phase occurs at CeO 2 concentrations of more than 0.15 mol, and is associated with polymorphic transformations of zirconium dioxide, which are typical for cases when dopant concentrations exceed a certain threshold value and result in the initialization of phase transformation processes. In the case of magnesium dioxide, the limiting threshold value for phase polymorphic transformations is 0.03-0.10 mol [50], and in the case of cerium dioxide, in conformity with the data obtained, the initialization of polymorphic transformations occurs at a CeO 2 dopant concentration of 0.15 mol, and at a concentration of 0.25, a complete polymorphic transformation of the monoclinic Zr 0.98 Ce 0.02 O 2 → tetragonal Zr 0.85 Ce 0.15 O 2 type occurs. In conformity with the X-ray phase analysis data, an alteration in the CeO2 dopant concentration results in the initialization of phase transformation processes, which can be written as follows: monoclinic ZrO2 → monoclinic Zr0.98Ce0.02O2 → tetragonal Zr0.85Ce0.15O2.…”

Section: Characterization Of Initial Samples As a Function Of The Var...mentioning

confidence: 99%

Study of Radiation Damage Kinetics in Dispersed Nuclear Fuel on Zirconium Dioxide Doped with Cerium Dioxide

et al. 2023

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One area that holds promise for nuclear energy advancement, which is the most attractive industry for eliminating the imbalance in the energy sector and reducing the world’s energy shortage for the long term, is the replacement of traditional uranium fuel with plutonium fuel. The focus on this research area is due to the growing concern of the world community about the problem of handling spent nuclear fuel, including its further use or storage and disposal. The main aims of this paper are to study the resistance of composite ceramics based on zirconium and cerium dioxide to the hydrogenation processes and subsequent destructive embrittlement, and to identify patterns of growth stability attributable to the occurrence of interfacial boundaries and changes in the phase composition of ceramics. Studies have shown that the main effects of the structural distortion of the crystalline structure of ceramics are caused primarily by tensile deformation distortions, resulting in the accumulation of radiation-induced damage. The formation of Zr0.85Ce0.15O2 tetragonal phase of replacement in the structure of ceramics results in a more than two-fold reduction in the deformation distortion degree in cases of high-dose radiation with protons. The evaluation of the alteration in the strength properties of ceramics revealed that the variation in the phase composition due to polymorphic transformation of the monoclinic Zr0.98Ce0.02O2 → tetragonal Zr0.85Ce0.15O2 type results in the strengthening of the damaged layers and the improvement of the resistance to radiation-induced embrittlement and softening.

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“…Однако добавление оксидов вольфрама и алюминия не решает проблему со стабилизацией тетрагональной фазы оксида циркония. Для решения данной проблемы прибегают к легированию ZrO 2 такими оксидами, как CeO 2 , Y 2 O 3 , CaO и MgO[10][11][12]. Среди перечисленных оксидных соединений MgO обладает наивысшей температурой плавления (2852 0 С), а также образует с Al 2 O 3 шпинель MgAl 2 O 4 , которая обладает хорошими механическими свойствами.На данный момент нет информации о фазовом составе и микроструктуре многокомпонентных керамик ZrO 2…”

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SYNTHESIS OF MULTICOMPONENT ZRO2:WO3:AL2O3:MGO

Garanin,

Shakirzyanov,

Kozlovskiy

et al. 2024

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In this work, the phase composition and microstructure of multicomponent ZrO2:WO3:Al2O3:MgO ceramics were studied depending on the concentration of the components. The dependences between the concentration of elements in the initial charge and the phase composition, volume shrinkage, density and microstructure of synthesized samples are determined. It was found by Raman spectroscopy that the addition of an Al2O3:MgO mixture to the initial ZrO2:WO3 matrix does not lead to the formation of a ZrO2:WO3:Al2O3:MgO solid solution. With an increase in the content of Al2O3:MgO, there is an increase in volumetric shrinkage and density, which may be associated with the formation of the liquid phase of the WO3:Al2O3 system at a temperature of 1450 °C and, as a result, more efficient migration of pores and defects to the surface. The analysis of the SEM images of the cross sections of the obtained samples showed that all samples have a developed morphology with different grain shapes.

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Study of the Mechanisms of Polymorphic Transformations in Zirconium Dioxide upon Doping with Magnesium Oxide, as Well as Establishing the Relationship between Structural Changes and Strength Properties

Cited by 4 publications

References 40 publications

Study of the Effect of Variation in the Phase Composition of ZrO2/MgO Ceramics on the Resistance to Radiation Damage during Irradiation with Kr15+ Ions

Study of the Effect of Variation in the Phase Composition of ZrO2/MgO Ceramics on the Resistance to Radiation Damage during Irradiation with Kr15+ Ions

Study of Radiation Damage Kinetics in Dispersed Nuclear Fuel on Zirconium Dioxide Doped with Cerium Dioxide

SYNTHESIS OF MULTICOMPONENT ZRO<SUB>2</SUB>:WO<SUB>3</SUB>:AL<SUB>2</SUB>O<SUB>3</SUB>:MGO

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