Fine-Grained Tungstates SrWO4 and NaNd(WO4)2 with the Scheelite Structure Prepared by Spark Plasma Sintering

Потанина, Е. А.; Орлова, А. И.; Нохрин, А. В.; Михайлов, Д. А.; Болдин, М. С.; Сахаров, Н. В.; Belkin, O. A.; Lantsev, E. A.; Tokarev, M.G.; Чувильдеев, В. Н.

doi:10.1134/s0036023619030161

Cited by 11 publications

(4 citation statements)

References 48 publications

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“…Isostructured scheelite-like compounds can contain many elements in their composition, the isotopes of which are present in the waste of radiochemical technologies [13,14]. In this paper, two series of ceramic samples NaNd(WO 4 ) 2 (NNW) and NaNd(MoO 4 ) 2 (NNMo) with the structure of the mineral scheelite [15][16][17] were studied. For the synthesis of such tungstates and molybdates, a method based on the precipitation reaction from solutions of metal salts was used.…”

Section: Methodsmentioning

confidence: 99%

“…For the synthesis of such tungstates and molybdates, a method based on the precipitation reaction from solutions of metal salts was used. To obtain ceramics, the method of electropulse plasma sintering was used, which consists in high-speed heating of powder materials by passing successive DC pulses through the sintered material and graphite mold with simultaneous application of pressure [10,[15][16][17][18]. The sintering process…”

Section: Methodsmentioning

confidence: 99%

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Application of the GIXRD Technique to Investigation of Damaged Layers in NaNd(WO_4)-=SUB=-2-=/SUB=- and NaNd(MoO_4)-=SUB=-2-=/SUB=- Ceramics Irradiated with High-Energy Ions

2022

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The technique of grazing incidence X-ray diffractometry (GIXRD) was used to study damaged layers in NaNd(WO_4)2 and NaNd(MoO_4)2 ceramics irradiated with high-energy ions. The possibilities and applicability limits of the technique for the analysis of such samples are shown. Estimates of the degree of amorphization in near-surface layers of ceramics are given depending on the irradiation dose. The higher resistance of NaNd(MoO_4)2 ceramics to external radiation exposure as compared to NaNd(WO_4)2 has been demonstrated. Keywords: X-ray diffraction, Parallel beam method, Grazing incidence geometry, Ion irradiation, Ceramics, Radiation resistance, Amorphization, Damaged layer.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Application of the GIXRD Technique to Investigation of Damaged Layers in NaNd(WO_4)-=SUB=-2-=/SUB=- and NaNd(MoO_4)-=SUB=-2-=/SUB=- Ceramics Irradiated with High-Energy Ions

2022

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“…SPS is based on heating the compact through pulsed electric current under uniaxial pressing conditions, with high heating rates and short processing times measured in minutes. In particular, the potential of SPS has been experimentally demonstrated for synthesizing pyrochlore structure ceramic [26], scheelite [27][28][29], feldspar-like [30], sodium zirconium phosphate (NZP) [31], and glass-ceramic composites for immobilizing 90 Sr [32][33][34][35][36]. Additionally, our work has initially demonstrated high promise for applying SPS to produce a mineral-like SrTiO 3 perovskite matrix for 90 Sr immobilization, as well as to fabricate a prototype of IRS based on this approach [37].…”

Section: Introductionmentioning

confidence: 95%

Perovskite/Pyrochlore Composite Mineral-like Ceramic Fabrication for 90Sr/90Y Immobilization Using SPS-RS Technique

Papynov,

Shichalin,

Belov

et al. 2023

Coatings

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A novel solid-phase synthetic approach was developed to produce a mineral-like composite ceramic based on strontium titanate (SrTiO3) and yttrium titanate (Y2Ti2O7) matrices for immobilizing radionuclides such as 90Sr and its daughter product 90Y, as well as lanthanides and actinides, via reactive spark plasma sintering technology (SPS-RS). Using XRD, SEM, and EDS analyses, the sintering kinetics of the initial mixed oxide reactants of composition YxSr1–1.5xTiO3 (x = 0.2, 0.4, 0.6 and 1) and structure-phase changes in the ceramics under SPS-RS conditions were investigated as a function of Y3+ content. In addition, a detailed study of phase transformation kinetics over time as a function of the heating temperature of the initial components (SrCO3, TiO2, and Y2O3) was conducted via in situ synchrotron XRD heating experiments. The composite ceramic achieved relatively high physicomechanical properties, including relative density between 4.92–4.64 g/cm3, Vickers microhardness of 500–800 HV, and compressive strength ranging from 95.5–272.4 MPa. An evaluation of hydrolytic stability and leaching rates of Sr2+ and Y3+ from the matrices was performed, demonstrating rates did not exceed 10−5–10−6 g·cm−2·day−1 in compliance with GOST R 50926-96 and ANSI/ANS 16.1 standards. The leaching mechanism of these components was studied, including the calculation of solution penetration depth in the ceramic bulk and ion diffusion coefficients in the solution. These findings show great promise for radioactive waste conditioning technologies and the manufacturing of radioisotope products.

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“…Изоструктурные шеелитоподобные соединения могут содержать в своем составе многие элементы, изотопы которых присутствуют в отходах радиохимических технологий [13,14]. В настоящей работе исследованы две серии керамических образцов NaNd(WO 4 ) 2 (NNW) и NaNd(MoO 4 ) 2 (NNMo) со структурой минерала шеелита [15][16][17]. Для синтеза таких вольфраматов и молибдатов использовался метод, основанный Рентгеновская дифрактометрия в геометрии скользящего падения проводилась на лабораторном рентгеновском дифрактометре Bruker D8 Discover (вакуумная рентгеновская трубка, CuK α -излучение) в геометрии параллельного пучка [20] с параболическим зеркалом Гебеля, круглым коллиматором 1 mm на первичном пучке и щелью Соллера 0.2 • перед детектором.…”

Section: экспериментальная частьunclassified

Применение метода GIXRD для исследования нарушенных слоев в керамиках NaNd(WO_4)-=SUB=-2-=/SUB=- и NaNd(MoO_4)-=SUB=-2-=/SUB=-, подвергнутых облучению высокоэнергетическими ионами

Юнин¹,

Назаров²,

Потанина³

2022

Журнал Технической Физики

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The technique of grazing incidence X-ray diffractometry (GIXRD) was used to study damaged layers in NaNd(WO4)2 and NaNd(MoO4)2 ceramics irradiated with high-energy ions. The possibilities and applicability limits of the technique for the analysis of such samples are shown. Estimates of the degree of amorphization in near-surface layers of ceramics are given depending on the irradiation dose. The higher resistance of NaNd(MoO4)2 ceramics to external radiation exposure as compared to NaNd(WO4)2 has been demonstrated.

show abstract

Fine-Grained Tungstates SrWO4 and NaNd(WO4)2 with the Scheelite Structure Prepared by Spark Plasma Sintering

Cited by 11 publications

References 48 publications

Application of the GIXRD Technique to Investigation of Damaged Layers in NaNd(WO_4)-=SUB=-2-=/SUB=- and NaNd(MoO_4)-=SUB=-2-=/SUB=- Ceramics Irradiated with High-Energy Ions

Application of the GIXRD Technique to Investigation of Damaged Layers in NaNd(WO_4)-=SUB=-2-=/SUB=- and NaNd(MoO_4)-=SUB=-2-=/SUB=- Ceramics Irradiated with High-Energy Ions

Perovskite/Pyrochlore Composite Mineral-like Ceramic Fabrication for 90Sr/90Y Immobilization Using SPS-RS Technique

Применение метода GIXRD для исследования нарушенных слоев в керамиках NaNd(WO_4)-=SUB=-2-=/SUB=- и NaNd(MoO_4)-=SUB=-2-=/SUB=-, подвергнутых облучению высокоэнергетическими ионами

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