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

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

Manganese phosphate hydrate crystals were prepared from aqueous solutions containing MnCl2, (NH4)2HPO4, and citric acid. Switzerite [Mn3(PO4)2·7H2O] and niahite (NH4MnPO4·H2O) phases were produced at room temperature, and then, hureaulite [Mn5(PO3OH)2(PO4)2·4H2O] particles were obtained by aging at...

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Veröffentlicht in:Inorganic chemistry 2021-10, Vol.60 (19), p.14779-14785
Hauptverfasser: Uchiyama, Hiroaki, Okumura, Itta, Inoue, Sho, Kato, Masanori, Wakahara, Masashi
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container_issue 19
container_start_page 14779
container_title Inorganic chemistry
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creator Uchiyama, Hiroaki
Okumura, Itta
Inoue, Sho
Kato, Masanori
Wakahara, Masashi
description Manganese phosphate hydrate crystals were prepared from aqueous solutions containing MnCl2, (NH4)2HPO4, and citric acid. Switzerite [Mn3(PO4)2·7H2O] and niahite (NH4MnPO4·H2O) phases were produced at room temperature, and then, hureaulite [Mn5(PO3OH)2(PO4)2·4H2O] particles were obtained by aging at 80 °C or by hydrothermal treatment at 100–180 °C. The lower aging temperature (80 °C) and the chelation of Mn2+ ions by citric acid provided a slower crystal growth, resulting in large hexagonal prism blocks of ca. 500 μm in size. These were found to be single crystals of hureaulite by powder and single-crystal X-ray diffraction analysis. Diffuse reflectance spectroscopy and evaluation using L*a*b* color parameters indicated that the large single crystals present a vivid pink color and high transparency.
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