Phase diagram, electrical conductivity, and cation diffusion of the system lithium sulphate - zinc sulphate

Coupled anion and cation dynamics of silver orthophosphate in the picosecond range

“…Similar behaviour was reported in other substances, e.g., LiNaSO 4 [2,3], LiAgSO 4 [4], K 2 SO 4 [5], Li 4 Zn(SO 4 ) 3 [6], CsHSO 4 [7], K 2 CrO 4 [8] and Na 3 PO 4 [9].…”

Thermodynamic stability and correlation with synthesis conditions, structure and phase transformations in orthorhombic and monoclinic Li2M(SO4)2 (M = Mn, Fe, Co, Ni) polymorphs

“…Previous studies have revealed the feasibility of rotational disorder of SO 4 /ClO 4 À tetrahedra for many sulfates and perchlorates, frequently referred to as a "paddle wheel" mechanism of motion of the SO 4 /ClO 4 groups. [54][55][56][57][58][59][60][61] The TGA curves of both monoclinic and orthorhombic samples show a continuous weight loss below 250-300 C due to the presence of adsorbed water (see Table 1 for water contents). Despite all sample preparations being done in the glove box, the samples seem to have picked up adsorbed water, probably due to exposure to air (for 30-60 s) while loading them into the TGA/ IR instrument and/or dropping them into the calorimeter.…”

“…The rst is based on the feasibility of SO 4 rotational disorder as observed in many sulfate-based materials. [54][55][56][57] Though the enthalpy of formation from binary sulfates is positive for both orthorhombic and monoclinic polymorphs, it is signicantly larger for the orthorhombic phase. This suggests that, for the orthorhombic phase to be stable relative to the binary sulfates, it must have higher entropy as well.…”

Synthesis and Electrochemical Performance of the Orthorhombic Li2Fe(SO4)2 Polymorph for Li-Ion Batteries

“…With a potential of 3.83 V versus Li + /Li 0 , this new monoclinic marinite phase Li 2 Fe­(SO 4 ) 2 displays the highest potential ever observed for the Fe III+ /Fe II+ redox couple in a fluorine-free iron-based compound, rivaled only by the triplite form of LiFeSO 4 F (3.9 V vs Li + /Li 0 ). Other analogous Li 2 M­(SO 4 ) 2 phases (M = Co, Mn, Zn, Mg, and Ni) were prepared using similar solid-state routes with the cobalt-, manganese-, and magnesium-based phases being isostructural to the iron-based phase, , whereas the Ni-based material crystallizes in an orthorhombic structure. , In contrast, polymorphism was discovered for the Zn-based phase, as it could be stabilized into either the orthorhombic or the monoclinic marinite structures, depending on the annealing temperature. , Recalling that such polymorphism was previously encountered with other sulfate-based iron compounds (e.g., tavorite / triplite LiFeSO 4 F, − tavorite /layered LiFeSO 4 OH, , the α and β polymorphs of Na 2 Fe­(SO 4 ) 2 ,− ), we hypothesized that Li 2 Fe­(SO 4 ) 2 could be stabilized into different crystal structures as well.…”