Boron building ceramic protecting against neutron radiation

Tarasevich, B. P.; Isaeva, L. B.; Кузнецов, Е. В.; Zhenzhurist, I. A.

doi:10.1007/bf00677822

Cited by 6 publications

(3 citation statements)

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“…Gadolinite-datolite-type compounds attract interest because of their physical and chemical properties. They are considered as potential optical materials (Verstegen et al, 1972;Wang et al, 2009;Juwhari & White, 2012;Peng et al, 2016), materials for electrical engineering (Konerskaya et al, 1988;Tummala, 1991;Podlesov et al, 1992;Jean et al, 2002;Liu et al, 2007;Chiang et al, 2008), membrane technology (Farsiyants et al, 1989;Schubert, 2003), protection from neutron radiation (Tarasevich et al, 1990;Mann & Sidhu, 2012) and as a matrix for the immobilization of nuclear wastes (Ojovan & Lee, 2005;Malczewski & Dziurowicz, 2015). In geological sciences, gadolinite group minerals are used as a geochemical marker of magmatic as well as low-temperature processes (Bellatrecia et al, 2006;Zaccarini et al, 2008;Lyalina et al, 2014;Karas' & Ratkin, 2014).…”

Section: Introductionmentioning

confidence: 99%

Crystal structure of the OH-dominant gadolinite-(Y) analogue (Y,Ca)₂(Fe,□)Be₂Si₂O₈(OH,O)₂ from Heftetjern pegmatite, Norway

Чуканов

Aksenov

Расцветаева

et al. 2017

Acta Crystallogr Sect B

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A hydroxyl-dominant analogue of gadolinite-(Y) (OH-Gad) has been discovered in the Heftetjern granitic pegmatite, southern Norway, in association with late-stage rare-earth-element containing minerals. The empirical formula, based on ten O atoms per formula unit, is (YCaCeLaNd)(Fe□)BeSiO(OH). The mineral is monoclinic, space group P2/c, a = 4.7514 (10), b = 7.5719 (16), c = 9.9414 (2) Å, β = 90.015 (4)°, V = 357.663 (3) Å and Z = 2. The density calculated using the empirical formula is 3.903 g cm. The crystal structure was refined to R = 0.0217 for 776 reflections with I > 2σ(I). OH-Gad is isostructural with gadolinite-(Y) and it is characterized by the predominance of OH over O at the anionic Ø-site. The refined crystal-chemical formula is: (YCaCe)(Fe□)BeSiO[(OH)O(OH)*] (Z = 2). The possible orientation and local environment of the hydroxyl group were suggested based on bond-valence sum calculations and geometrical analysis of the crystal structure. The infrared spectrum confirms disordering of H atoms. OH-Gad seems to be a potentially new mineral, the first simultaneously hydroxyl- and iron-dominant member of the gadolinite subgroup. It is an OH-analogue of gadolinite-(Y) and an Fe-analogue of hingganite-(Y).

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Section: Introductionmentioning

confidence: 99%

Crystal structure of the OH-dominant gadolinite-(Y) analogue (Y,Ca)₂(Fe,□)Be₂Si₂O₈(OH,O)₂ from Heftetjern pegmatite, Norway

Чуканов

Aksenov

Расцветаева

et al. 2017

Acta Crystallogr Sect B

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“…The mineral datolite is a calcium borate silicate and has chemical formula given as CaBSiO 4 (OH). It has special application as a raw material in the glass industry and in the production of special ceramics used to immobilize medium-level radioactive wastes for disposal [1] and to protect from neutron radiation [2]. Other uses are in the electrical engineering [3][4][5] in the microfiltration processes of waste and natural water [6] and in the protection of metals [7].…”

Section: Introductionmentioning

confidence: 99%

Thermal analysis and vibrational spectroscopic characterization of the boro silicate mineral datolite – CaBSiO4(OH)

Frost

Scholz

et al. 2013

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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The objective of this work is to determine the thermal stability and vibrational spectra of datolite CaBSiO4(OH) and relate these properties to the structure of the mineral. The thermal analysis of datolite shows a mass loss of 5.83% over a 700-775°C temperature range. This mass loss corresponds to 1 water (H2O) molecules pfu. A quantitative chemical analysis using electron probe was undertaken. The Raman spectrum of datolite is characterized by bands at 917 and 1077cm(-1) assigned to the symmetric stretching modes of BO and SiO tetrahedra. A very intense Raman band is observed at 3498cm(-1) assigned to the stretching vibration of the OH units in the structure of datolite. BOH out-of-plane vibrations are characterized by the infrared band at 782cm(-1). The vibrational spectra are based upon the structure of datolite based on sheets of four- and eight-membered rings of alternating SiO4 and BO3(OH) tetrahedra with the sheets bonded together by calcium atoms.

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“…Due to their exceptional physical and chemical properties, the minerals of the gadolinite supergroup [1] have been investigated for the past decades for potential use in the electrical engineering industry or as materials for radiation shields [2–6] . In petrology and geochemistry the gadolinite group minerals also serve as markers for geological reconstructions [7–9] …”

Section: Introductionmentioning

confidence: 99%

Polymorphs of the Gadolinite‐Type Borates ZrB₂O₅ and HfB₂O₅ Under Extreme Pressure

Pakhomova

Fuchs

Dubrovinsky

et al. 2021

Chemistry A European J

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Based on the results from previous high‐pressure experiments on the gadolinite‐type mineral datolite, CaBSiO4(OH), the behavior of the isostructural borates β‐HfB2O5 and β‐ZrB2O5 have been studied by synchrotron‐based in situ high‐pressure single‐crystal X‐ray diffraction experiments. On compression to 120 GPa, both borate layer‐structures are preserved. Additionally, at ≈114 GPa, the formation of a second phase can be observed in both compounds. The new high‐pressure modification γ‐ZrB2O5 features a rearrangement of the corner‐sharing BO4 tetrahedra, while still maintaining the four‐ and eight‐membered rings. The new phase γ‐HfB2O5 contains ten‐membered rings including the rare structural motif of edge‐sharing BO4 tetrahedra with exceptionally short B−O and B⋅⋅⋅B distances. For both structures, unusually high coordination numbers are found for the transition metal cations, with ninefold coordinated Hf4+, and tenfold coordinated Zr4+, respectively. These findings remarkably show the potential of cold compression as a low‐energy pathway to discover metastable structures that exhibit new coordinations and structural motifs.

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Boron building ceramic protecting against neutron radiation

Cited by 6 publications

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Crystal structure of the OH-dominant gadolinite-(Y) analogue (Y,Ca)₂(Fe,□)Be₂Si₂O₈(OH,O)₂ from Heftetjern pegmatite, Norway

Crystal structure of the OH-dominant gadolinite-(Y) analogue (Y,Ca)₂(Fe,□)Be₂Si₂O₈(OH,O)₂ from Heftetjern pegmatite, Norway

Thermal analysis and vibrational spectroscopic characterization of the boro silicate mineral datolite – CaBSiO4(OH)

Polymorphs of the Gadolinite‐Type Borates ZrB₂O₅ and HfB₂O₅ Under Extreme Pressure

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Boron building ceramic protecting against neutron radiation

Cited by 6 publications

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Crystal structure of the OH-dominant gadolinite-(Y) analogue (Y,Ca)2(Fe,□)Be2Si2O8(OH,O)2 from Heftetjern pegmatite, Norway

Crystal structure of the OH-dominant gadolinite-(Y) analogue (Y,Ca)2(Fe,□)Be2Si2O8(OH,O)2 from Heftetjern pegmatite, Norway

Thermal analysis and vibrational spectroscopic characterization of the boro silicate mineral datolite – CaBSiO4(OH)

Polymorphs of the Gadolinite‐Type Borates ZrB2O5 and HfB2O5 Under Extreme Pressure

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Crystal structure of the OH-dominant gadolinite-(Y) analogue (Y,Ca)₂(Fe,□)Be₂Si₂O₈(OH,O)₂ from Heftetjern pegmatite, Norway

Crystal structure of the OH-dominant gadolinite-(Y) analogue (Y,Ca)₂(Fe,□)Be₂Si₂O₈(OH,O)₂ from Heftetjern pegmatite, Norway

Polymorphs of the Gadolinite‐Type Borates ZrB₂O₅ and HfB₂O₅ Under Extreme Pressure