Abstract
Lithium tris-odium bis-(sulfate) hexa-hydrate, LiNa3(SO4)2·6H2O was crystallized from aqueous solution at 298 K and the structure solved at different temperatures between 90 and 293 K. The structure is isomorphic with the corresponding molybdate and selenate double salt hydrate. It belongs to the non-centrosymmetric trigonal space group R3c (161). The temperature dependence of the lattice parameters has been determined. Further characterization by powder XRD and thermal analysis is reported.
Highlights
In the presently preferred process of LiOH production for batteries, an aqueous Li2SO4 solution is reacted with NaOH at temperatures well below 273 K for separating sodium sulfate in the form of its decahydrate (Glauber salt) according to the equation
Single-crystal structure determination was performed at five temperatures between 90 and 293 K
The results confirm the isomorphism to the molybdate LiNa3(MoO4)2Á6H2O (Kaminskii et al, 2009) and no structural change within the investigated temperature range
Summary
In the presently preferred process of LiOH production for batteries, an aqueous Li2SO4 solution is reacted with NaOH at temperatures well below 273 K (mostly at 268 K) for separating sodium sulfate in the form of its decahydrate (Glauber salt) according to the equation. During cooling the solution from ambient temperature, the solution passes the stability field of LiNa3(SO4)2Á6H2O, which extends from 271.3 to 321 K (Sohr et al, 2017). Once formed, it will not disappear on further cooling. It is known that the material loses its water of crystallization very . In their careful thermodynamic study of the system Li2SO4–Na2SO4–H2O at 298 K, Filippov & Kalinkin (1989) did not make an attempt to isolate the double salt hydrate because of instability. Kaminskii and coworkers grew large crystals of the molybdate (Kaminskii et al, 2009) and selenate (Kaminskii et al, 2007) for studies on the non-linear optical effects of the materials, where they redetermined and refined the crystal structures at ambient temperature, but without discussion of structural details
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