Glycol-citrate synthesis of fine-grained oxides La2−xGdxZr2O7 and preparation of corresponding ceramics using FAST/SPS process

Sakharov, Konstantin A.; Simonenko, Elizaveta P.; Симоненко, Н. П.; Vaganova, M. L.; Lebedeva, Yu. E.; Chaynikova, A.S.; Osin, I. V.; Sorokin, O. Yu.; Гращенков, Д. В.; Sevastyanov, V. G.; Кузнецов, Н. Т.; Каблов, Е. Н.

doi:10.1016/j.ceramint.2018.01.188

Cited by 13 publications

(6 citation statements)

References 47 publications

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“…40,45,46 Moreover, beyond 1650°C, fluoritephased Gd 2 Zr 2 O 7 tend to be prepared either by both joule heating and SPS (FAST/SPS) sintering method. 30,47,48 Furthermore, multi-phased Gd 2 Zr 2 O 7 glass-ceramics were also fabricated by extending the SPS sintering temperature beyond 1850°C.…”

Section: Resultsmentioning

confidence: 99%

“…With the combination of chemical reaction in precursor synthesis, the fabrication temperature of fluorite‐phased Gd 2 Zr 2 O 7 could be reduced to even 1100°C . Moreover, beyond 1650°C, fluorite‐phased Gd 2 Zr 2 O 7 tend to be prepared either by both joule heating and SPS (FAST/SPS) sintering method . Furthermore, multi‐phased Gd 2 Zr 2 O 7 glass‐ceramics were also fabricated by extending the SPS sintering temperature beyond 1850°C.…”

Section: Resultsmentioning

confidence: 99%

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Rapid synthesis of Gd₂Zr₂O₇ glass‐ceramics using spark plasma sintering

et al. 2019

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Glass‐ceramics are possible host matrix for high level waste immobilization. The Gd2Zr2O7 glass‐ceramic matrix was successfully synthesized using spark plasma sintering (SPS) method in 5 minutes. The phase transition with sintering temperature was studied using X‐ray diffraction, Raman and transmission electron microscopy. It revealed that samples kept a main defected fluorite phase as being sintered below 1800°C. Glass phase increased rapidly beyond 1850°C. The amorphous structure became the main body at 1900°C, with nanoscale crystal scattered in the bulk. With the increase of glass phase, the grain boundary became almost indistinguishable. The relationship between the final phase of Gd2Zr2O7 with its synthetic temperature range and corresponding technology was reviewed. Gd2Zr2O7 glass‐ceramics could be acquired by extending the sintering temperature beyond 1850°C using SPS method.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Rapid synthesis of Gd₂Zr₂O₇ glass‐ceramics using spark plasma sintering

et al. 2019

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“…Synthesis of the Cs 2 MoO 4 sample was carried out using the glycol–citrate method described in detail elsewhere 25–31 . During the synthesis, a complexing agent (citric acid, n (C 6 H 8 O 7 ) = 0.5 n (Cs + Mo)) and ethylene glycol ( n (C 2 H 6 O 2 ) = 2 n (Cs + Mo)) were added to an aqueous solution of CsNO 3 and (NH 4 ) 6 Mo 7 O 24 ·4H 2 O ( n (Cs): n (Mo) = 2:1).…”

Section: Methodsmentioning

confidence: 99%

Vaporization and thermodynamics of the Cs₂O–MoO₃ system studied using high‐temperature mass spectrometry

Stolyarova

Vorozhtcov

Лопатин

et al. 2021

Rapid Comm Mass Spectrometry

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Rationale Cesium and molybdenum are fission products of uranium dioxide fuel in nuclear reactors, which interact with each other depending on the oxygen potential of the fuel. This leads to formation of various compounds of the Cs2O–MoO3 system, which are exposed to high temperatures during operation of a reactor or a severe accident at a nuclear power plant. This is why the study of the vaporization and thermodynamics of compounds in the Cs2O–MoO3 system is important. Methods Synthesis of the compounds in the Cs2O–MoO3 system was carried out by sintering Cs2MoO4 and MoO3. Characterization of the samples was accomplished with the use of XRD, TGA/DSC/DTA, IR spectroscopy, and ICP emission spectroscopy. Vaporization of the samples under study was carried out from a platinum effusion cell using an MS‐1301 mass spectrometer developed for high‐temperature studies of low‐volatility substances. Results The temperature dependences of partial pressures of vapor species were determined over pure MoO3 and Cs2MoO4 in the ranges 870–1000 K and 1030–1198 K, respectively. MoO3, Mo2O6, Mo3O9, Mo4O12, and Mo5O15 were shown to be the main vapor species over the Cs2O–MoO3 system in the temperature range 850–1020 K. The component activities, Gibbs energies of mixing, and excess Gibbs energies were obtained as functions of the component concentration at 900, 950, and 1000 K. Conclusions The thermodynamic properties of the Cs2O–MoO3 system found in the study evidenced negative deviations from ideality. The MoO3 and Cs2MoO4 partial molar enthalpies of mixing, the Cs2MoO4 partial vaporization enthalpy, and the total enthalpy of mixing in the Cs2O–MoO3 system at 1000 K were obtained for the first time.

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“…The unit cell parameters (a-axial length a) of La 2 Zr 2 O 7 and La 0.5 Gd 1.5 Zr 2 O 7 are 10.7949(3)Å and 10.5762(3)Å, respectively, which are in good agreement with the previous reports. 19 In in situ synchrotron X-ray diffraction experiments, symmetry-type diamond anvil cells (DACs) were employed as a high-pressure apparatus. This was carried out by applying a focused monochromatic beam of l ¼ 0.6199Å using a 4W2 beamline at the Beijing Synchrotron Radiation Facility.…”

Section: Experiments Detailsmentioning

confidence: 99%

“…Rittman et al's experimental study 17 proved that a higher annealing temperature can signicantly reduce the concentration of defects in the lattice, and increase the transition pressure P s . Usually, a combustion method requires a lower annealing temperature (1500 K, 2-3 h) 19 compared with a solidstate method (1800 K, 10 h). 36 In our study, the samples were annealed at 1773 K for 3 h, which is higher than the other combustion path synthesized samples.…”

Section: Tablementioning

confidence: 99%