Structural Phase Transitions in Mechanoactivated Manganese Oxides

Abstract

An investigation has been undertaken of the structural characteristics of the manganese oxides to understand these characteristics affected by mechanochemical treatment conditions. Chemically pure manganese (II, III) oxides and their mixtures were used as the initial components.

Mechanical Activation of Mn-O Oxides: Structural Phase Transitions, Magnetism and Oxygen Isotope Exchange

“…Investigation of phase transitions taking place in mechano-activated oxides under ambient and nonambient conditions allows one to reveal size effects as well as peculiarities of redox-processes in activated (especially nanosized) materials and to determine the mechanism activation processes that affect the type and parameters of different structural phase transitions. Distinguishable features of phase transitions and equilibria in the nanosized oxides were studied in [1][2][3][4][5][6][7][8]. It was established that mechano-activated systems transferred to the nanosized state show, for example, significant changes of temperature ranges and latent heat of polymorph phase transitions.…”

Mechanochemical Synthesis of Mn3O4 Nanocrystals and Their Lithium Intercalation Capability

“…18 Even though milling of some manganese oxides has been described in literature, no mechanochemical synthesis of nanocrystalline Mn 3 O 4 from simpler oxides has been reported so far. Fishman et al 19,20 describe the milling of coarse-grained Mn 3 O 4 or mixtures of Mn 3 O 4 with Mn 2 O 3 or MnO 2 and Mn 2 O 3 with MnO 2 . A solid-state synthesis with subsequent quenching is still necessary to produce Mn 3 O 4 .…”