Study of the Hydrolytic Stability of Fine-Grained Ceramics Based on Y2.5Nd0.5Al5O12 Oxide with a Garnet Structure under Hydrothermal Conditions

Alekseeva, L. S.; Нохрин, А. В.; Болдин, М. С.; Lantsev, E. A.; Мурашов, А. А.; Орлова, А. И.; Чувильдеев, В. Н.

doi:10.3390/ma14092152

Cited by 13 publications

(7 citation statements)

References 52 publications

(67 reference statements)

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“…Yttrium aluminum garnet Y 3 Al 5 O 12 doped with Ce 3+ ions (YAG:Ce) phosphor compounds are the most prevalent for the manufacture of white LEDs [1][2][3][4]. YAG-based materials are also applied as scintillators [5,6], in dosimetry [7,8], as well as in various luminescent devices [1,9,10], where they are used in powders, films, ceramics, single crystals, and composites [11][12][13][14][15][16][17][18][19][20]. Materials and structural elements produced based on YAG are high-tech and highly resistant to various external influences, including mechanical, thermal, chemical, and radiation.…”

Section: Introductionmentioning

confidence: 99%

Electron Beam-Assisted Synthesis of YAG:Ce Ceramics

et al. 2023

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In this work, we present the results of the structure and luminescence properties of YAG:Ce (Y3Al5O12 doped with Ce3+ ions) ceramic samples. Their synthesis was carried out by sintering samples from the initial oxide powders under the powerful action of a high-energy electron beam with an energy of 1.4 MeV and a power density of 22–25 kW/cm2. The measured diffraction patterns of the synthesized ceramics are in good agreement with the standard for YAG. Luminescence characteristics at stationary/time-resolved regimes were studied. It is shown that under the influence of a high-power electron beam on a mixture of powders, it is possible to synthesize YAG:Ce luminescent ceramics with characteristics close to the well-known YAG:Ce phosphor ceramics obtained by traditional methods of solid-state synthesis. Thus, it has been demonstrated that the technology of radiation synthesis of luminescent ceramics is very promising.

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Section: Introductionmentioning

confidence: 99%

Electron Beam-Assisted Synthesis of YAG:Ce Ceramics

et al. 2023

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“…Ceramic materials obtained by SPS are characterized by a high relative density and enhanced physical and mechanical properties, which open up new possibilities for obtaining the ceramic materials for various purposes [ 4 , 27 , 48 , 49 , 50 , 51 , 52 ]. Some of these ceramics have a high radiation resistance [ 4 , 52 , 53 , 57 ] and high hydrolytic stability [ 4 , 56 , 58 , 59 ].…”

Section: Introductionmentioning

confidence: 99%

(Na, Zr) and (Ca, Zr) Phosphate-Molybdates and Phosphate-Tungstates: I–Synthesis, Sintering and Characterization

et al. 2023

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Submicron-grade powders of Na1-xZr2(PO4)3-x(XO4)x compounds (hereafter referred to as NZP) and Ca1-xZr2(PO4)3-x(XO4)x compounds (hereafter, CZP), X = Mo, W (0 ≤ x ≤ 0.5) were obtained by sol-gel synthesis. The compounds obtained were studied by X-ray diffraction phase analysis and electron microscopy. An increase in the W or Mo contents was shown to result in an increase in the unit cell volume of the NZP and CZP crystal lattices and in a decrease in the coherent scattering region sizes. Thermal expansion behavior at high temperatures of synthesized NZP and CZP compounds has been investigated. The dependencies of the parameters a and c on the heating temperature, as well as the temperature dependence of the crystal lattice unit cell volume V in the range from the room temperature up to 800 °C, were obtained. The dependencies of the average thermal expansion coefficient (αav) and of the volume coefficient (β) on the W and Mo contents in the compositions of NZP and CZP compounds were studied. Ceramics Na1-xZr2(PO4)3-x(XO4)x with relatively high density (more than 97.5%) were produced by spark plasma sintering (SPS). The increase in the W or Mo contents in the ceramics leads to an increase in the relative density of NZP and to a decrease of the optimum sintering temperature. The mean grain size in the NZP ceramics decreases with increasing W or Mo contents. The study of strength characteristics has revealed that the hardness of the NZP ceramics is greater than 5 GPa, and that the minimum fracture toughness factor was 1 MPa·m1/2.

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“…Spark plasma sintering (SPS) has gained widespread use for sintering powder composites [26][27][28][29][30][31][32][33]. This technique involves pulsed electrical current heating of a sample under applied pressure.…”

Section: Introductionmentioning

confidence: 99%

Hybrid Sol–Gel and Spark Plasma Sintering to Produce Perovskite-like SrTiO3 Ceramics for Radioactive Waste Isolation

Belov,

Shichalin,

Papynov

et al. 2023

J. Compos. Sci.

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The paper presents a reliable technology combining sol–gel synthesis and spark plasma sintering (SPS) to obtain SrTiO3 perovskite-type ceramics with excellent physicomechanical properties and hydrolytic stability for the long-term retention of radioactive strontium radionuclides. The Pechini sol–gel method was used to synthesize SrTiO3 powder from Sr(NO3)2 and TiCl3 (15%) precursors. Ceramic matrix samples were fabricated by SPS in the temperature range of 900–1200 °C. The perovskite structure of the synthesized initial SrTiO3 powder was confirmed by X-ray diffraction and thermal analysis results. Scanning electron microscopy revealed agglomeration of the nanoparticles and a pronounced tendency for densification in the sintered compact with increasing sintering temperature. Chemical homogeneity of ceramics was confirmed by energy dispersive X-ray analysis. Physicochemical characteristic studies included density measurement results (3.11–4.80 g·cm−3), dilatometric dependencies, Vickers microhardness (20–900 HV), and hydrolytic stability (10−6–10−7 g·cm−2·day−2), exceeding GOST R 50926-96 and ISO 6961:1982 requirements for solid-state matrices. Ceramic sintered at 1200 °C demonstrated the lowest strontium leaching rate of 10−7 g/cm2·day, optimal for radioactive waste (RAW) isolation. The proposed approach can be used to fabricate mineral-like forms suitable for RAW handling.

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Study of the Hydrolytic Stability of Fine-Grained Ceramics Based on Y2.5Nd0.5Al5O12 Oxide with a Garnet Structure under Hydrothermal Conditions

Cited by 13 publications

References 52 publications

Electron Beam-Assisted Synthesis of YAG:Ce Ceramics

Electron Beam-Assisted Synthesis of YAG:Ce Ceramics

(Na, Zr) and (Ca, Zr) Phosphate-Molybdates and Phosphate-Tungstates: I–Synthesis, Sintering and Characterization

Hybrid Sol–Gel and Spark Plasma Sintering to Produce Perovskite-like SrTiO3 Ceramics for Radioactive Waste Isolation

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