Manganese violet

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Ammonium manganese(3+) diphosphate

Manganese Violet Used as Precursor to Synthesize LiMnPO4 Cathode Material

Abolghasem Kazeminasab, et al. Polyhedron, 2024, 247(1), 116711.

The preparation of LiMnPO4 can be achieved through a new mechanochemical synthesis method using manganese violet (NH4MnP2O7) as the precursor. In this method, the reaction between NH4MnP2O7 and Li2CO3 is carried out in a solid state at room temperature, and a mechanochemical reaction occurs, as well as oxidation-reduction and acid-base reactions.
Mechanochemical process
· In this mechanochemical process, a solid acid-base reaction occurs between ammonium ions and carbonate ions.
· Mn III is an unstable oxidation state and is converted into crystalline β-MnO2, Li2MnP2O7 and NH4H2PO4 during the disproportionation reaction.
· In solid-state reactions, manganese violet has a tendency to disproportionate into MnO2 and manganese pyrophosphate salts.
· The pyrolysis reaction is carried out under an inert atmosphere, and a redox reaction occurs between β-MnO2 and Li2MnP2O7 to obtain LiMnPO4.
· Finally, the particle size distribution of crystal LiMnPO4 obtained from NH4MnP2O7 is 60-260 nm.

Synthesis of Irreversible Thermochromic Sensor Based on Manganese Violet

Nguyen, Duy Khiem, et al. Materials, 2018, 11(9), 1693.

Manganese violet (MV, NH4MnP2O7) is used in many important pigment applications. Manganese violet powder can reversibly change color from purple to blue when heated gently. At higher temperatures (400°C), manganese purple irreversibly changes from purple to white. Therefore, manganese violet can be used to fabricate irreversible thermochromic sensors. The thermal behavior of the manganese violet-based thermochromic sensor highlights the potential of this system for temperature sensing applications.
Manufacturing of Thermochromic Sensors
· First, pure α-MnNH4P2O7 phase manganese violet pigment was prepared through manganese dioxide, ammonium dihydrogen phosphate and phosphoric acid.
· The synthesized manganese violet pigment is then mixed with a potassium silicate solution as a binder and deionized (DI) water as a solvent to create a thermochromic coating.
· The prepared thermochromic paint was coated on the surface of the steel plate substrate to prepare an irreversible thermochromic sensor. In order to improve the bonding force between the coating and the surface of the steel plate, a sandblasting machine is used to treat the surface of the steel plate with abrasive powder. After air-drying, the coated samples were baked in an oven at 300 °C for 1 h to fabricate thermochromic sensors.

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