Low temperature synthesis of Mn{sub 3}O{sub 4} polyhedral nanocrystals and magnetic study
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050 (China)
- Analysis and Testing Center for Inorganic Materials, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050 (China)
Manganese oxide (hausmannite) polyhedral nanocrystals were prepared by a microwave-assisted solution-based method using Mn(CH{sub 3}COO){sub 2} and (CH{sub 2}){sub 6}N{sub 4} at 80 deg. C. The as-prepared Mn{sub 3}O{sub 4} nanocrystals were characterized by means of X-ray diffraction, field-emission transmission electron microscopy, field-emission scanning electron microscopy and Raman spectrum. Mn{sub 3}O{sub 4} polyhedral nanocrystals prepared by microwave heating at 80 deg. C for 60 min were of cubic and rhombohedral shapes with the edge lengths in the range of 15-40 nm. Mn{sub 3}O{sub 4} nanocrystals grew following the Ostwald ripening mechanism with increasing reaction time. High-resolution transmission electron microscopy and selected area electron diffraction confirm that the as-obtained polyhedral nanocrystals were single-crystalline. The magnetic behavior of Mn{sub 3}O{sub 4} nanocrystals was studied. Mn{sub 3}O{sub 4} nanocrystals show an obvious ferromagnetic behavior at low temperatures. The magnetic behavior of Mn{sub 3}O{sub 4} nanocrystals was sensitive to crystal size. Ferromagnetic onset temperatures (T {sub c}) of samples 1 and 3 are 40.6 and 41.1 K, respectively, lower than that observed for bulk Mn{sub 3}O{sub 4} (42 K)
- OSTI ID:
- 20784978
- Journal Information:
- Journal of Solid State Chemistry, Vol. 179, Issue 4; Other Information: DOI: 10.1016/j.jssc.2006.01.033; PII: S0022-4596(06)00042-9; Copyright (c) 2006 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- English
Similar Records
Controlled synthesis of Mn{sub 3}O{sub 4} and MnCO{sub 3} in a solvothermal system
Synthesis of MnOOH nanorods by cluster growth route from [Mn{sub 12}O{sub 12}(RCOO){sub 16}(H{sub 2}O) {sub n} ] (R=CH{sub 3}, C{sub 2}H{sub 5}). Rational conversion of MnOOH into Mn{sub 3}O{sub 4} or MnO{sub 2} Nanorods