The influence of mechanical activation on the morphological changes of Fe/BaTiO3 powder

• Published in: Materials science & engineering. B, Solid-state materials for advanced technology Solid-state materials for advanced technology, 2016-10, Vol.212, p.89-95
• Main Authors: Kosanovic, D, Obradovic, N, Pavlovic, V P, Markovic, S, Maricic, A, Rasic, G, Vlahovic, B, Pavlovic, V B, Ristic, M M
• Format: Article
• Language: English
• Subjects: Agglomerates; Barium titanates; Comminution; Crystal structure; Iron; Materials science; Mechanical activation; Mechanical alloying and milling; Microstructure; Morphology; Multiferroic; Raman spectroscopy; Scanning electron microscopy
• ISSN: 0921-5107; 1873-4944
• DOI: 10.1016/j.mseb.2016.07.016

[Display omitted] •Fe/BaTiO3 ceramic was prepared using a solid-state reaction.•Powder mixture of 60% Fe and 40% BaTiO3 was mechanically activated up to 240min.•Microstructure was characterized using Powder XRD and SEM.•Thermal stability of the activated samples was investigated using DSC.•Raman spectrum changes with activation, along with atypical resonant scattering. Crystal structure and morphology of mechanically activated nanocrystalline Fe/BaTiO3 was investigated using a combination of spectroscopic and microscopic methods. These show that mechanical activation led to the creation of new surfaces and the comminution of the initial powder particles. Prolonged milling resulted in formation of larger agglomerates of BaTiO3 and bimodal particle size distribution, where BaTiO3 particles were significantly larger than those of iron-containing phases. Milling times of 210min and above lead to a significant decrease in temperature of the oxidation of iron in the sample, indicating abrupt change in reactivity. Raman spectroscopy analysis has revealed that activation had a pronounced influence on Fe/BaTiO3 lattice, thereby affecting both the stability of the crystal structure and the phase transition phenomena.