Rapid synthesis, kinetics and thermodynamics of binary Mn0.5Ca0.5(H2PO4)2 · H2O

Soft Synthesis Route and Characterization of Superparamagnetic Mn1/2Fe1/2(H2PO4)2·2H2O and Its Decomposed Product

“…To corroborate the calculated data with the spectroscopic ones, we drew up the FT-IR spectra of the studied compound (Figure ). Table shows the comparison of the ω calc values with the ω sp values determined from this compound, together with the assignments of the corresponding vibrational modes in the literature. , These wavenumbers are close to the vibrational modes of water of crystallization and dihydrogen phosphate group (H 2 PO 4 − ) reported in the literature. − The results confirm that the loss of the water of crystallization and deprotonated dihydrogen phosphate group in the first step is followed by a continuous intermolecular polycondensation for the second step. − The studied compound exhibited a very good agreement between the calculated wavenumbers from average T p (DTA) and the observed wavenumbers from IR spectra for the bonds that were suggested to be broken.…”

“…The value of the Avrami exponent provides information regarding the morphology of the growing crystal. ,− ,, The value of n reflects the mechanism dominating crystallization. Here, smaller n values indicate that the crystallization is dominated by a surface crystallization or that the crystallization dimension is low.…”

“…Recently, M 1− x Ni x (H 2 PO 4 ) 2 · x H 2 O (M = Mg, Mn, Fe, Co, Zn, and Cd) were prepared by corresponding metal carbonates and phosphoric acid at 293 K for 2−90 days . More recently, Mn 1− x A x (H 2 PO 4 ) 2 · x H 2 O (A = Ca, Fe, Co, Ni, and Cu) were prepared by metal sources (Mn (c; complexometric) or MnCO 3 and A(II) = CaCO 3 , Fe, CoCO 3 , NiCO 3 , or CuCO 3 ) and phosphoric acid H 3 PO 4 at ambient temperature for 20 s. These procedures were strong exothermic reactions and evolved gases (CO 2 and H 2 ). − However, a limited dose of M 1− x A x (H 2 PO 4 ) 2 · n H 2 O could be synthesized without toxic gases.…”

Colorimetric and microscopic study of the thermal behavior of new ceramic pigments

“…They enjoy good thermal and photochemical reactivity and stability in the sintering processes, yet they provide a narrow tint domain obtained by co‐precipitation with various chromophore cations and anions. Conversely, in addition to the environmental challenges related to their manufacture techniques, chromate‐based pigments, which generate the most interesting groups of tints with great coverage and compatible when mixed with other ceramic pigments or fritted materials, have the disadvantage of poor thermal reactivity and stability in the varnishing processes (Belina and Sulcova, ; Martos et al, ; Boonchom et al, ).…”