New Structure Type among Octahydrated Rare‐Earth Sulfates, β‐Ce₂(SO₄)₃·8H₂O, and a new Ce₂(SO₄)₃·4H₂O Polymorph

Abstract

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Sustainable Hydrometallurgical Recovery of Valuable Elements from Spent Nickel–Metal Hydride HEV Batteries

“…The small decrease in the rare earth concentration with time in 2 mol/L H 2 SO 4 at 25 • C, seen in Figure 3, could be due to precipitation of rare earth sulfates, but there was no visible precipitation in the leach solution in this experiment. There are many REE sulfate hydrates and also polymorphs reported in the literature, however, at 25 • C the binary nonahydrates (La and Ce) or octahydrates (heavier REE) are expected to be the most stable phases in saturated water solution [41,42]. The solubility of rare earth sulfates (REE 2 (SO 4 ) 3 •xH 2 O) decreases as the temperature increases and as the sulfuric acid concentration increases [43,44].…”

Room temperature interfacial reaction-directed synthesis of hierarchically porous ceria from a water-soluble precursor

“…38-0572) and other phases with different hydrate numbers cannot be completely excluded since Ce 2 (SO 4 ) 3 displays great diversity in the hydrate number. 32 Aer the interfacial reaction, the diffraction pattern of the sample can be indexed to a facecentered cubic pure phase of ceria without any residual precursor (JCPDS no. 34-0394).…”

Syntheses, crystal structures and optical spectroscopy of Ln2(SO4)3·8H2O (Ln=Ho, Tm) and Pr2(SO4)3·4H2O

“…S2 and S3 (Supplementary Material). [2]) but it is not isostructural to Er 2 (SO 4 ) 3 Á 4H 2 O, which adopts space group P À1 (no. 2) [3].…”

“…The hydrogen bonds with donator and acceptor distances between 2.73 and 3.04Å can be classified as moderate according to the measures of Refs. [1,2]. The crystal water molecules Table 1 Crystal data and structure refinements.…”

“…With increasing crystal water content tetrahydrates M 2 (SO 4 ) 3 Á 4H 2 O (M¼ La, Nd [1], Ce [2], Er [3]) and even octahydrates M 2 (SO 4 ) 3 Á 8H 2 O (M¼Y [4], Ce [5], Pr [6], Nd [7], Sm [8], Eu [9], Gd [10], Tb [3], Dy [5], Er [11], Yb [12], Lu [5]) are formed. These sulphates crystallise isotypically in space group C2/c.…”