X-Ray Diffraction Study of Cs5(HSO4)3(H2PO4)2, a New Solid Acid with a Unique Hydrogen-Bond Network

A review on synthesis and characterization of solid acid materials for fuel cell applications

“…A study by Lee et al [51] indicated that LiH 2 PO 4 crystals and polycrystalline pellets behave differently as the latter is more stable in low-humidity surroundings and air. The compounds and phases of mixed-oxyanion solid acids precipitated via slow isothermal evaporation from mixtures of aqueous Cs 2 CO 3 , H 2 SO 4 and H 3 PO 4 solutions differ from those precipitated rapidly by solvent introduction [82]. Colomban et al [64] found that different synthesis parameters during CHS production such as the evaporation temperature, heating duration, sample grinding and pressure affect the size, morphology and chemical properties of the product.…”

Synthesis, structure determination and calorimetric study of new caesium hydrogen selenate arsenate Cs4(SeO4)(HSeO4)2(H3AsO4)

“…However, Cs 4 (SeO 4 )(HSeO 4 ) 2 (H 3 AsO 4 ) is isostructural to Cs 4 (SeO 4 )(HSeO 4 ) 2 (H 3 PO 4 ) [5] compound having a non-centrosymmetric space group (P2 1 ). H atoms positions were identified on the basis of geometric considerations (the combination of O· · ·O and X-O lengths [23]; where X = Se and As). An examination of intertetrahedra oxygen distances and X-O lengths suggest the existence of five hydrogen sites (Fig.…”

Structural and vibrational study of a new mixed dipotassium hydrogenselenate dihydrogenphosphate K2(HSeO4)1.5(H2PO4)0.5

“…2). H-atoms positions were identified on the basis of geometric considerations (the combination of O· · ·O and X O lengths [14]; where X = Se and P). An examination of intertetrahedral oxygen distances and X O lengths suggest the existence of three hydrogen sites, the first H(1) linking and because full occupancy would have provided more hydrogen than was expected on the basis of the chemical analysis.…”