Thermal decomposition of managanese oxyhydroxide
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Cited by (43)
Upcycling spent alkaline batteries into rechargeable zinc metal batteries
2022, Nano EnergyCitation Excerpt :EDX mapping shows the uniform distribution of Mn and O in the Reg400 (Fig. 2i). Thermal gravimetric analysis (Fig. S8) shows that there are three main thermal events when heating the regenerated sample from room temperature to 900 °C in the air atmosphere, in the range of 170–200 °C, 500–600 °C, and 800–900 °C, corresponding to the MnO2 formation, Mn2O3 and Mn5O8 formation, as well as Mn3O4 formation, respectively. [33,34] Overall, above results indicate the feasibility of our simple thermal reduction/oxidation approach toward the restoration and reshaping of spent anode and cathode materials in alkaline batteries.
Synthesis of manganese titanate and its precursors from xerogel
2020, Ceramics InternationalCitation Excerpt :Rhombohedral Mn2O3 is not related to stable modifications of manganese oxides. Earlier, rhombohedral Mn2O3 with a corundum-type structure was synthesized as a product of vacuum dehydration of oxyhydroxide MnOOH at 350 °C [34]. As the broadening of the reflexes indicates, the phases of manganese and titanium oxides are very fine-crystalline at the minimum annealing temperature 450 °C.
Isomorphous substitutions in sillenite-family single-crystal Bi<inf>24</inf>(M<inf>2-</inf><inf>x</inf>Mn<sup>4+</sup><inf>x</inf>)O<inf>40</inf> solid solutions (M = Al<sup>3+</sup>, Fe<sup>3+</sup>, Ge<sup>4+</sup>, Ti<sup>4+</sup>, Cr<sup>4+</sup>, V<sup>5+</sup>)
2019, Journal of Crystal GrowthCitation Excerpt :As a result of the TEM analysis of the CrMn-p and VMn-n samples, the cation compositions of seven random particles with sizes up to 1.5 μm were analyzed (Fig. 2). In the CrMn-p sample, a presence of three phases was detected: the Bi24Mn2O40 and γ-Bi2O3 with the sillenite structure (space group I23) (Fig. 2a), as well as the rhombohedral modification of Mn2O3 (space group R3̅c; a = 5.04, c = 14.14 Å) [31] (Fig. 2b) and Bi2Mn4O10 (space group Pbam; a = 7.540, b = 8.534, c = 5.766 Å) [32] (Fig. 2c). It should be noted that the a unit cell parameter, determined from the electron diffraction pattern for the detected rhombohedral Mn2O3 phase, coincides with the analogous parameter of the rhombohedral modification [31] and differs from the cubic modification in the 〈1 1 1〉 orientation.
Applications of the "nano to bulk" Mn oxides: Mn oxide as a Swiss army knife
2015, Coordination Chemistry ReviewsCitation Excerpt :The Mn(II) ions occupy the tetrahedral sites and the Mn(III) ions lie in the octahedral voids, displaying the expected Jahn–Teller distortion. Several forms of Mn2O3 [38–45] include the orthorhombically-distorted bixbyite structure, in a Pbca space group type [42–45]. Above 300 K a phase transition to a cubic form is observed [42].
Oxidation state and chemical shift investigation in transition metal oxides by EELS
2012, UltramicroscopyCitation Excerpt :For Mn3O4, the L3 edge appears to be split and the intensity ratio of the split peaks was found to be the same with the well-crystalized hausmannite mineral [16,31]. Although MnOOH is known to decompose to Mn2O3 in vacuum at 250 °C [8], its O–K ELNES remains different from our Mn2O3 reference, which implies that MnOOH is stable under our illumination conditions. However, the V-L2,3 ELNES of LaVO4 is observed to change with time in the spectrum series.
Oxidation of synthetic hausmannite (Mn<inf>3</inf>O<inf>4</inf>) to manganite (MnOOH)
2009, Journal of Molecular Structure