Composition, Structure, and Conditions of Formation of Fluorine-Bearing Sodalite: Experimental Evidence

Gramenitskii, E. N.; Kotelnikov, A. R.; Shchekina, T. I.; Yakubovich, O. V.; Devyatova, V. N.; Zubkov, E.; Сук, Н. И.; Вигасина, М. Ф.; Kotelnikova, Z. A.

doi:10.1134/s0016702918060058

Cited by 3 publications

(3 citation statements)

References 11 publications

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“…The strongest band of the CO 3 2- 14]). The IR spectrum of Sample 10 was discussed elsewhere [15]. In accordance with structural data and by analogy with IR spectra of natural fluoraluminates [30], the band at 597 cm −1 corresponds to stretching vibrations of the AlF 6 3-anion.…”

Section: Infrared Spectroscopymentioning

confidence: 79%

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Extra-Framework Content in Sodalite-Group Minerals: Complexity and New Aspects of Its Study Using Infrared and Raman Spectroscopy

et al. 2020

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Nine samples of carbonate-free sodalite-group minerals, including those with abnormally high contents of polysulfide groups, fluoride anion and carbon dioxide molecules as well as synthetic fluoraluminate sodalite-type compound Na8(Si7Al5O24)(AlF6)3–·5H2O, have been studied by means of electron microprobe analyses, infrared and Raman spectroscopy; the CO2 content was determined using the selective sorption of gaseous ignition products. This article describes a semi-quantitative method for estimating the content of carbon dioxide molecules in these minerals, based on IR spectroscopy data. The data obtained demonstrate the existence of a sulfide sodalite-group mineral with the idealized formula Na7(Si6Al6O24)(S3−)·H2O, which differs significantly from the formula Na6Ca2(Si6Al6O24)S2–2 accepted for lazurite. According to single-crystal X-ray structural analysis, in the F-rich sodalite-group mineral from the Eifel paleovolcanic region, Germany with the idealized formula Na7(Si6Al6O24)F−·nH2O fluorine occurs as an isolated F− anion, unlike synthetic F-rich sodalite-type compounds.

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Section: Infrared Spectroscopymentioning

confidence: 79%

“…and neutral molecules (H 2 O, CO 2 ) [1][2][3][4][5][6][7][8][9][10][11]. Sodalite-type compounds with different additional anions (CO 3 − , HCOO − , AlF 6 3-, OH − ) have been synthesized [12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Extra-Framework Content in Sodalite-Group Minerals: Complexity and New Aspects of Its Study Using Infrared and Raman Spectroscopy

et al. 2020

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“…ANSTO have successfully demonstrated the fabrication of hot-isostatically pressed (HIPed) sodalite glass-ceramic wasteforms to immobilize eutectic (Li,K)Cl salts containing fission products 11 ; however, the F-bearing equivalent, fluorosodalite, is significantly less known. 12 For radioactive wasteforms, a prime advantage of hot isostatic pressing (HIPing) is to achieve the required phase and theoretical density of the wasteform with minimum temperature and therefore minimum grain size, which aids the overall strength and leaching resistance. A second important advantage of the HIPing process is that the high-temperature consolidation step is undertaken when the waste and additive precursors are enclosed within a HIP canister.…”

Section: Introductionmentioning

confidence: 99%

Hot Isostatically Pressed (HIPed) fluorite glass‐ceramic wasteforms for fluoride molten salt wastes

et al. 2020

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Molten pyroprocessing salts can be used to dissolve used nuclear fuel from a reactor allowing recovery of the actinides. Previously, ANSTO have demonstrated hot isostatically pressed (HIPed) sodalite glass‐ceramic wasteforms for eutectic (Li,K)Cl salts containing fission products, but this system cannot be used for the analogous molten alkali fluoride salts (eg, FLiNaK), which have utility in the application of the next generation of nuclear reactors. In this work, a novel glass‐ceramic composite wasteform has been prepared by HIPing, as a candidate for the immobilization of fission product‐bearing FLiNaK salts. The wasteform has been tailored to immobilize the high fluoride content of the waste within fluorite, whereas the waste alkali elements are incorporated in a durable sodium aluminoborosilicate glass, with total waste loadings of ~17‐21 wt% achieved. It was also demonstrated that the speciation of Mo‐ and Sb‐simulated fission products was altered by adding Ti metal due to a controlled redox environment. The resulting candidate wasteform has been studied by X‐ray diffraction and scanning electron microscopy, including the HIP canister‐wasteform interaction zone, and its performance assessed via leaching studies using the PCT and ASTM C1220 leaching protocols. Dr Vance very much enjoyed the challenge of wasteform design for problematic nuclear wastes, for which fission product‐bearing FLiNaK salts are a clear example. His ability to hone in on a wasteform solution with viable waste loadings that meet performance requirements was testament to his nearly 40 years experience in nuclear waste immobilization. The samples discussed in this work represent the last wasteform materials that he prepared.

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Spectroscopic and Crystal-Chemical Features of Sodalite-Group Minerals from Gem Lazurite Deposits

et al. 2020

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Five samples of differently colored sodalite-group minerals from gem lazurite deposits were studied by means of electron microprobe and wet chemical analyses, infrared, Raman, electron spin resonance (ESR) and UV-Visible spectroscopy, and X-ray diffraction. Various extra-framework components (SO42−, S2− and Cl− anions, S3•−, S2•− and SO3•− radical anions, H2O, CO2, COS, cis- as well as trans- or gauche-S4 neutral molecules have been identified. It is shown that S3•− and S4 are the main blue and purple chromophores, respectively, whereas the S2•− yellow chromophore and SO3•− blue chromophore play a subordinate role. X-ray diffraction patterns of all samples of sodalite-group minerals from lazurite deposits studied in this work contain superstructure reflections which indicate different kinds of incommensurate modulation of the structures.

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Composition, Structure, and Conditions of Formation of Fluorine-Bearing Sodalite: Experimental Evidence

Cited by 3 publications

References 11 publications

Extra-Framework Content in Sodalite-Group Minerals: Complexity and New Aspects of Its Study Using Infrared and Raman Spectroscopy

Extra-Framework Content in Sodalite-Group Minerals: Complexity and New Aspects of Its Study Using Infrared and Raman Spectroscopy

Hot Isostatically Pressed (HIPed) fluorite glass‐ceramic wasteforms for fluoride molten salt wastes

Spectroscopic and Crystal-Chemical Features of Sodalite-Group Minerals from Gem Lazurite Deposits

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