Comparative study of the rare earth environment in rare earth metaborate glass (REB 3 O 6 , RE = La, Nd) and in sodium borate glasses

Majérus, Odile; Trégouët, H.; Caurant, Daniel; Pytalev, D. S.

doi:10.1016/j.jnoncrysol.2015.05.031

Cited by 15 publications

(5 citation statements)

References 46 publications

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“…The atomic pair correlation function of Nd-O indicates a first neighbor distance at 2.30 ± 0.02 Å, which is lower than that reported earlier 38,40 with an additional peak at 2.70 ± 0.05 Å. The average Nd-O coordination number is 6.2 ± 0.1 and 5.6 ± 0.1 for Matrix-Nd10 and Matrix-Nd30 samples, respectively.…”

Section: Resultscontrasting

confidence: 66%

Structural investigation of borosilicate glasses containing lanthanide ions

Fábián

Gergely

Osán

et al. 2020

Sci Rep

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High level radioactive actinides are produced as a side product in reprocessing spent nuclear fuel, for which safe long-term-inert immobilizer matrices are needed. Borosilicate glasses are of great potential amongst the candidates of suitable inert materials for radioactive waste immobilization. Understanding the effects of actinide addition to a borosilicate glass matrix is of great importance in view of waste immobilization. Here we present structural studies of a simplified glass-matrix, − 55SiO2·10B2O3·25Na2O·5BaO·5ZrO2 - upon adding lanthanide (Ln-)oxides: CeO2, Nd2O3, Eu2O3, in two different concentrations 10% and 30w% each, to investigate the effects of lanthanides (Ln) taken as chemical surrogates for actinides. Neutron diffraction combined with of Reverse Monte Carlo simulations show that all investigated glass structures comprise tetrahedral SiO4, trigonal BO3 and tetrahedral BO4 units, forming mixed [4]Si-O-[3]B and [4]Si-O-[4]B linkages. 11B Magic Angle Spinning Nuclear Magnetic Resonance is indicative of simultaneous presence of trigonal BO3 and tetrahedral BO4 units, with spectral fractions strongly dependent on the Ln addition. Ln-addition promote the BO3 + O-→[BO4]– isomerization resulting in lower fraction of boron in BO3, as compared to BO4 units. Raman spectra, in full agreement with neutron diffraction, confirm that the basic network structure consists of BO3/trigonal and SiO4/BO4 tetrahedral units. Second neighbour atomic pair correlations reveal Ce, Nd, Eu to be accommodated in both Si and B sites, supporting that the borosilicate-matrix well incorporates Ln-ions and is likely to similarly incorporate actinides, opening a way to radioactive nuclear waste immobilization of this group of elements in a borosilicate glass matrix.

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Section: Resultscontrasting

confidence: 66%

Structural investigation of borosilicate glasses containing lanthanide ions

Fábián

Gergely

Osán

et al. 2020

Sci Rep

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“…A detailed structural study of the SiO2-B2O3-La2O3 ternary glasses will be presented in another paper. The crystallization and structural study of the RE-metaborate (REB3O6) glass composition belonging to the B2O3-RE2O3 binary system for RE = La and Nd was already published [9,10,24].…”

Section: Introductionmentioning

confidence: 99%

Exploration of glass domain in the SiO2-B2O3-La2O3 system

Trégouët

Caurant

Majérus

et al. 2017

Journal of Non-Crystalline Solids

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The existence of a relatively wide glass domain has been put in evidence in the SiO2-B2O3-La2O3 ternary system, using a melt-quenching method. This domain extends from a region surrounding the lanthanum metaborate (LaB3O6) composition in the B2O3-La2O3 binary system to ternary compositions bearing up to 39 mol% SiO2. Outside this domain, phase separation phenomena and/or crystallization of La-rich borate (LaBO3) and borosilicate (La3Si2BO10) phases are observed during quenching. The evolution of glass transition temperature (Tg) with composition in the glassy domain has been studied and discussed according to structural changes put in evidence by 11 B MAS NMR. Moreover, the evolution of the thermal stability of a series of glasses derived from a lanthanum metaborate glass by substituting B2O3 by increasing amount of SiO2 (up to 36 mol% SiO2) was studied by DTA and thermal treatments followed by characterization by XRD and Raman spectroscopy. In spite of silica-enrichment along the glass series, the first phases crystallizing during heating were always lanthanum borates (LaB3O6, LaBO3) according the following sequence when SiO2 content increases:

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“…Other studies demonstrated that the addition of sodium and calcium along with Al 2 O 3 and B 2 O 3 enhances the incorporation rate and stability of lanthanides within the given aluminoborosilicate networks. − Angeli et al investigated the effect of lanthanum (La) incorporation in borosilicate glass using various techniques, such as 29 Si, 11 B, and 17 O magic angle spinning (MAS) and 17 O multiple quantum magic angle spinning (MQMAS) nuclear magnetic resonance (NMR) spectroscopy. The solid-state 29 Si MAS NMR provided information on the degree of polymerization in simple glasses, and 11 B MAS NMR data indicated the interactions between boron elements within the borosilicate network.…”

Section: Types Of Waste Formsmentioning

confidence: 99%

Inorganic Waste Forms for Efficient Immobilization of Radionuclides

et al. 2021

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The immobilization of long-lived radionuclide wastes generated from nuclear power plants (NPPs) during NPP operation, fuel reprocessing, and decommissioning of nuclear reactors is of great environmental concern. Designing suitable matrices with high durability, stability, and resistivity to various physical and chemical conditions (temperature, pressure, radiation, acidity/alkalinity, etc.) are required for the safe disposal and effective immobilization of radioactive wastes. In this review, we highlight and discuss the key developments in the design and applications of major inorganic waste forms for radioactive waste immobilization. Specifically, we review (i) glasses (borosilicates, phosphates, and sintered glasses), (ii) cements (Portland cement, cast stone/saltstone, hydroceramics, and geopolymer), (iii) synrocs (hollandite, zirconolite, and perovskite), and (iv) ceramics (titanates, sodalite, apatite, monazites, and goethite/magnetite). Additionally, we present future challenges that should be addressed during the design and selection of suitable waste forms for the immobilization of radionuclides. We believe that this paper can deepen our understanding of various waste forms and their roles in radioactive waste immobilization.

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Comparative study of the rare earth environment in rare earth metaborate glass (REB 3 O 6 , RE = La, Nd) and in sodium borate glasses

Cited by 15 publications

References 46 publications

Structural investigation of borosilicate glasses containing lanthanide ions

Structural investigation of borosilicate glasses containing lanthanide ions

Exploration of glass domain in the SiO2-B2O3-La2O3 system

Inorganic Waste Forms for Efficient Immobilization of Radionuclides

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