Synthesis of continuous substitutional solid solutions M1−x Ni x (H2PO4)2 · 2H2O with M = Mg, Mn, Co, or Zn

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

“…The corresponding observed mass losses of 11.86 (1.89 mol of H 2 O) and 11.73 (1.86 mol of H 2 O) % by mass are assigned to the dehydration of coordination water molecules (eq 9) and an intramolecular dehydration of the protonated dihydogenphosphate groups (eq 10), respectively. The total mass loss of 23.58% (3.74 mol H 2 O) is in agreement with those reported for other binary dihydrogenphosphate dihydrate in the literature (1 < mole of water < 4). − The thermal decomposition process of Mn 1/2 Fe 1/2 (H 2 PO 4 ) 2 ·2H 2 O could be formally presented as: Mn 1 / 2 Fe 1 / 2 ( normalH 2 PO 4 ) 2 · 2 H 2 O → 373 − 423 K Mn 1 / 2 Fe 1 / 2 ( normalH 2 PO 4 ) 2 + 2 H 2 O Mn 1 / 2 Fe 1 / 2 ( normalH 2 PO 4 ) 2 → 473...…”

“…The total mass loss of 23.58% (3.74 mol H 2 O) is in agreement with those reported for other binary dihydrogenphosphate dihydrate in the literature (1 < mole of water < 4). − The thermal decomposition process of Mn 1/2 Fe 1/2 (H 2 PO 4 ) 2 ·2H 2 O could be formally presented as: Mn 1 / 2 Fe 1 / 2 ( normalH 2 PO 4 ) 2 · 2 H 2 O → 373 − 423 K Mn 1 / 2 Fe 1 / 2 ( normalH 2 PO 4 ) 2 + 2 H 2 O Mn 1 / 2 Fe 1 / 2 ( normalH 2 PO 4 ) 2 → 473 − 673 K 1/2MnFeP 4 …”

“…Binary metal(II) dihydrogenphosphate hydrates M 1− x A x (H 2 PO 4 ) 2 · n H 2 O (M and A = Mg, Ca, Mn, Fe, Co, Ni, Zn, or Cu; x = 0−1; n = 1−4) have been investigated for over 30 years and have been widely applied as potential pigments, selective catalysts, phosphors, and materials for corrosion-resistant coatings, and they are biocompatible and biodegradable in tissue. − This phosphate hydrate group is transformed to binary metal(II) cyclotetraphosphate group M 2− y A y P 4 O 12 ( y = 0−2) via the reactions of dehydration and deprotonation of dihydrogenphosphate groups as well as polycondensation at high temperatures. − Both phosphate groups are good sources for macro- and micronutrients (P, Mg, Ca, Mn, Fe, Co, Ni, Zn, Cu) required by plants. − Consequently, these phosphate materials have been become a hot research topic in materials science in recent years.…”

“…Some binary metal M 1− x A x (H 2 PO 4 ) 2 · n H 2 O were prepared for the first time by Trojan et al using corresponding metal carbonates and phosphoric acid at low temperature (313−353 K) with long time periods (2−60 h), − and releasing toxic gas (CO 2 ). 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 .…”

“…Some binary metal M 1− x A x (H 2 PO 4 ) 2 · n H 2 O were prepared for the first time by Trojan et al using corresponding metal carbonates and phosphoric acid at low temperature (313−353 K) with long time periods (2−60 h), − and releasing toxic gas (CO 2 ). 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.…”