𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Mixtures of iron and anatase TiO2 by mechanical alloying

✍ Scribed by A.M. Calle; L.C. Sánchez; J.D. Arboleda; J.J. Beltrán; C.A. Barrero; J. Osorio; K. Nomura

Publisher
Elsevier Science
Year
2008
Tongue
English
Weight
374 KB
Volume
39
Category
Article
ISSN
0026-2692

No coin nor oath required. For personal study only.

✦ Synopsis

Fe-doped TiO 2 powders were obtained by mechanical alloying. The starting materials were anatase TiO 2 and metallic iron (a-Fe) or hematite (a-Fe 2 O 3 ). The influence of different milling conditions such as: ball to powder weight ratio, milling time, rotation velocity of supporting disc, and dopant concentration on the structural and magnetic properties were investigated. All experiments were performed in atmospheric conditions. The milled powders were characterized by X-ray diffraction (XRD) using Rietveld refinement and room temperature Mo¨ssbauer spectrometry. The XRD patterns of all samples show the coexistence of both anatase and rutile phases and also the high-pressure srilankite phase. Mo¨ssbauer spectra reveal the presence of Fe 2þ and Fe 3þ states in Fe-doped TiO 2 as well as a-Fe or a-Fe 2 O 3 in samples obtained from metallic iron or hematite, respectively. The Fe 3þ contribution could be attributed to Fe incorporated in the TiO 2 structure and the Fe 2þ can be probably assigned to surface ferrous ions in the TiO 2 .

📜 SIMILAR VOLUMES

Mechanical properties of anatase and sem
Mechanical properties of anatase and semi-metallic TiO2 nanotubes
✍ Felix Schmidt-Stein; Stefan Thiemann; Steffen Berger; Robert Hahn; Patrik Schmuk 📂 Article 📅 2010 🏛 Elsevier Science 🌐 English ⚖ 997 KB

We report for the first time on mechanical properties of anodically formed, self-organized TiO 2 nanotube layers on titanium. We compare their behavior in their virgin state and after conversion to their semi-metallic form by an acetylene treatment. We show that the acetylene treatment leads to sign

Kinetics and Mechanisms of Phase Transfo
Kinetics and Mechanisms of Phase Transformations Induced by Ball-Milling in Anatase TiO2
✍ S. Bégin-Colin; T. Girot; G. Le Caër; A. Mocellin 📂 Article 📅 2000 🏛 Elsevier Science 🌐 English ⚖ 332 KB

Ball-milling is a way of inducing phase transformations, chemical reactions, and changes in the reactivity of solids. It is a complex process for which several models have been developed to predict the evolution of systems and to describe its physics. These models sometimes empirically need experime

Formation of anatase TiO2 nanoparticles
Formation of anatase TiO2 nanoparticles by simple polymer gel technique and their properties
✍ S.N. Karthick; K. Prabakar; A. Subramania; Ji-Tae Hong; Jin-Ju Jang; Hee-Je Kim 📂 Article 📅 2011 🏛 Elsevier Science 🌐 English ⚖ 791 KB

Pure anatase nano-TiO 2 powders were successfully prepared by a simple polymer gel technique using poly-(vinylpyrrolidone) (PVP) as the polymer. The products were systematically characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), field-emission scanning electron microsc