Mn3−xZnxO4 spinel phases in the Zn–Mn–O system

✍ Scribed by M. Peiteado; S. Sturm; A.C. Caballero; D. Makovec

• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 725 KB
• Volume: 56
• Category: Article
• ISSN: 1359-6454
• DOI: 10.1016/j.actamat.2008.04.024

✦ Synopsis

The thermal evolution of the Zn-Mn-O system in air was studied by X-ray diffraction, transmission electron microscopy-energy dispersive spectroscopy and electron energy loss spectroscopy. The obtained results suggest that this evolution involves the formation of different Mn 3Àx Zn x O 4 spinel-type phases. With increasing temperature these spinels experience phase transformations which are found to be induced by the Mn(IV) to Mn(III) reduction process. This last cation is an active Jahn-Teller ion which leads to an appreciable distortion of the Mn 3Àx Zn x O 4 spinel structure, from a cubic symmetry at low temperatures to highly distorted tetragonal symmetries at high temperatures.