Structural aspects of the formation of solid solutions in the NaF-KF-AlF3 system

Samoilo, Alexander S.; Zaitseva, Julia N.; Dubinin, P. S.; Piksina, Oksana; Ruzhnikov, Sergei G.; Yakimov, Igor S.; Кирик, С. Д.

doi:10.1016/j.jssc.2017.04.037

Cited by 9 publications

(5 citation statements)

References 17 publications

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“…The second is the interaction with LiF and the formation of new phases. The formation of a solid solution based on chiolite was previously observed when part of sodium was replaced by potassium [18,19]. Refinement of the crystal structure using X-ray powder diffraction data showed that the substitution of sodium for potassium occurs only in the 2-fold position of sodium by ~ 40 %.…”

Section: Interaction Of Chiolite With Lifmentioning

confidence: 84%

“…The study of the NaF-KF-AlF 3 system in [18,19] have shown small region of solid solutions based on Na 5 Al 3 F 14 . Potassium ions replaced sodium only in one of two crystallographic positions.…”

Section: Introductionmentioning

confidence: 99%

“…In the second topic, the effect of lithium fluoride on chiolite is discussed. Earlier it was found [18,19] that chiolite forms solid solutions with the substitution of sodium for potassium. There was no information on the change in chiolite in the presence of LiF.…”

Section: Introductionmentioning

confidence: 99%

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Solid Solutions in Aluminum Electrolytes with the Participation of LiF

Zaitseva¹

2022

J. Sib. Fed. Chem.

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The paper presents the investigation of the solid solutions formation in the fluoride system Na5Al3F14-Na3AlF6-K3AlF6 with the addition of LiF. Two local regions were under consideration. The first case concerns the possibility of potassium and sodium cations replacing with lithium in the elpasolite (K2NaAlF6) when LiF is added to the electrolyte. In the second, the effect of lithium fluoride on the chiolite (Na5Al3F14) was studied. The investigation was motivated by the need to control the composition of the electrolyte during the electrolytic production of aluminum. The electrolyte samples were obtained from the initial fluorides under laboratory conditions. Determination of crystal-chemical details of the structure of solid solutions was carried out by the method of full-profile analysis (Rietveld method) on multiphase polycrystalline samples. It was found that the addition of LiF in the structure of elpasolite is accompanied by a gradual substitution of lithium for sodium with the formation, ultimately, of the K2LiAlF6 phase with the lattice parameter a = 8.0779 Å. Potassium is not subject to substitution. No dissolution of LiF in the structure of cryolite (Na3AlF6) was found. It was shown that chiolite does not form solid solutions with LiF upon crystallization

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Section: Interaction Of Chiolite With Lifmentioning

confidence: 84%

Section: Introductionmentioning

confidence: 99%

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Solid Solutions in Aluminum Electrolytes with the Participation of LiF

Zaitseva¹

2022

J. Sib. Fed. Chem.

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“…The surface tension in the system decreases linearly with the temperature (740 to 815°C) as shown in equation 10: . X =2.6033 -9.2738 • 10 -4 .T (10) where X is the surface tension ( 3 N/m) and T is the temperature in the range (740-815) °C…”

Section: Electrolytes and Influence On Its Properties By The Additivementioning

confidence: 99%

“…The complex ionic form such as AlF ,AlF $ ,AlF , Al O F and Al OF are formed at 1<CR<3 and Al O F complex ion is only formed at 3<CR<4 in alumina saturated melts [6], [7], [8]. The structural properties of solid cryolite were widely studied by Kirik et al [9] and Samoilo et al [10].…”

Section: Introductionmentioning

confidence: 99%

Electrolytes and its additives used in aluminum reduction cell: a review

Padamata

Yasinskiy

Polyakov

2019

Metall. Res. Technol.

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The electrolyte is considered to play the role of blood in an aluminum reduction cell and performs several vital functions as the charge transfer, the mass dissolution and transfer, the electrode products separation and the electrical work dissipation. The proper performance of listed functions is completely determined by the physical and chemical properties, which namely are the electrical conductivity, the viscosity, the vapor pressure, the liquidus and solidus temperatures, the density, the surface tension, the solubility and the dissolution rate of oxides, aluminum, carbon and the various connections and by operating conditions, which namely are the temperature, the current density, the anode-cathode distance, etc. The electrolyte affects the current efficiency and the cell voltage, which determines the specific energy consumption and the total cost of aluminum. This is the reason why different electrolytes and additives have been in the spotlight of the researchers and the enterprises for decades. This article presents the brief information about the influence of additives in the cell utilizing traditionally used sodium cryolite and different low-temperature electrolytes on physical-chemical properties and concentrates on the latest works which have not been included in widely known textbooks. The article also contains new experimental results obtained by the authors and devoted to the effective electrical conductivity of suspended unconventional electrolytes.

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