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Chemical Approach to a New Crystal Structure: Phase Control of Manganese Oxide on a Carbon Sphere Template
Author(s) -
Nam Ki Min,
Park Joon T.
Publication year - 2014
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201403021
Subject(s) - wurtzite crystal structure , manganese , phase (matter) , materials science , carbon fibers , hexagonal phase , salt (chemistry) , chemical engineering , crystal structure , crystallography , inorganic chemistry , chemistry , hexagonal crystal system , organic chemistry , metallurgy , composite material , composite number , engineering
The stabilization and growth of a non‐native structure, hexagonal wurtzite MnO (h‐MnO), is explored via kinetic control of manganese precursor on a carbon sphere template. MnO is most stable in the cubic rock‐salt structure (c‐MnO), and a number of studies have focused on the synthesis and properties of this rock‐salt phase. However, h‐MnO has not been fully characterized before our work. Prolonged heating at a relatively low temperature yields c‐MnO, whereas rapid heating of the reaction mixture at reflux produces h‐MnO in the presence of carbon spheres. The effect of benzyl amine concentration on the formation of two different oxidation states (c‐MnO and t‐Mn 3 O 4 ) was examined as well. Moreover, the structural stability of the manganese oxides and phase transition of MnO in terms of the wurtzite to rock‐salt structural transformation have been investigated.