Nanocrystalline manganese dihydrogen phosphate dihydrate Mn(H2PO4)2·2H2O and its decomposition product (Mn2P4O12) obtained by simple precipitation route

A facile electrochemical approach for the deposition of iron–manganese phosphate composite coatings on aluminium

“…2(a and b) and Table 1) has also been observed earlier by other researchers. [34][35][36][37][38][39] The FT-IR and Raman spectrum of the coatings deposited on the mild steel anode are quite similar to the one deposited on the Al cathode (please refer ESI 2, 3 and 4 †), suggesting that they are also consists of hydrated manganese phosphate.…”

Aqueous Synthesis of Manganese Phosphate Hydrate Crystals for Creating Inorganic Pigment Materials

“…10 However, manganese phosphates can exist in a variety of compositions containing manganese ions in different oxidation states (Mn 2+ and/or Mn 3+ ), such as Mn 3 (PO 4 ) 2 , 3,4,8 MnPO 4 , 12 MnHP 2 O 7 , 13 and Mn 2 P 4 O 1 . 14,15 Such manganese phosphate materials also often exhibit vivid colors, and as such they have a high potential for pigment and optical applications.…”

“…Recently, Begum and Wright studied the detailed structures of manganese phosphate pigments and reported that α- and β-NH 4 MnP 2 O 7 are the principal components in commercial manganese violet . However, manganese phosphates can exist in a variety of compositions containing manganese ions in different oxidation states (Mn 2+ and/or Mn 3+ ), such as Mn 3 (PO 4 ) 2 , ,, MnPO 4 , MnHP 2 O 7 , and Mn 2 P 4 O 1 . , Such manganese phosphate materials also often exhibit vivid colors, and as such they have a high potential for pigment and optical applications.…”

“…Historically, such materials have been treasured and used as jewelry components. Furthermore, a number of natural and artificial hydrated manganese phosphates, such as Mn 3 (PO 4 ) 2 ·3H 2 O, MnPO 4 ·H 2 O, Mn­(H 2 PO 4 )·2H 2 O, and Mn 5 (PO 4 ) 2 (PO 3 OH) 2 ·4H 2 O, − are known, while such manganese phosphate hydrates have not been fully evaluated as pigment materials. They are expected to be promising candidates for application as pigments and in optical devices.…”

Synthesis of MnNiP2O7 and Nonisothermal Decomposition Kinetics of a New Binary Mn0.5Ni0.5HPO4·H2O Precursor Obtained from a Rapid Coprecipitation at Ambient Temperature

“…They are transformed to other phosphates by hydrolysis and dehydration reactions at high temperatures. [6][7][8] The presence of water molecules influences the intermolecular interactions (affecting the internal energy and enthalpy) as well as the crystalline disorder (entropy) and, hence, influences the free energy, thermodynamic activity, solubility, stability, and electrochemical and catalytic activities. [9][10][11][12] Studies on the thermodynamics, mechanisms, and kinetics of solid-state reactions are a challenging and difficult task with complexity resulting from the great variety of factors with diverse effects such as reconstruction of solid-state crystal lattices, formation and growth of new crystallization nuclei, diffusion of gaseous reagents or reaction products, heat conductance of materials, static or dynamic character of the environment, and physical state of the reagentssdispersity, layer thickness, specific area and porosity, type, amount and distribution of the active centers on solid state surface, etc.…”