𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Magnetic characterization of the mechanically induced thermite reaction between Fe2O3 and Al

✍ Scribed by C. Cuadrado-Laborde; L.C. Damonte; L. Mendoza-Zélis; L.M. Socolovsky; I.L. Torriani

Publisher
Elsevier Science
Year
2004
Tongue
English
Weight
242 KB
Volume
354
Category
Article
ISSN
0921-4526

No coin nor oath required. For personal study only.

✦ Synopsis

We have investigated the mechanically induced self-propagating reaction between Fe 2 O 3 and Al. In this reaction the final phases, Al 2 O 3 and Fe, are formed by an in situ chemical reaction. The evolution of the system was characterized as a function of the milling time using X-ray diffraction, magnetometry (300 and 5 K) and Mo¨ssbauer spectroscopy (300 and 77 K). After reaction, Fe particles in a crystalline Al 2 O 3 matrix have been formed. At larger milling times, a rather wide Fe grain size distribution of around 20 nm was obtained according to the diffraction patterns. Mo¨ssbauer spectra were constituted of both paramagnetic and ferromagnetic contributions. The former was attributed to small grains of superparamagnetic Fe (within the Mo¨ssbauer characteristic time t M E10 À8 s) and FeAl 2 O 4 , whereas the latter was associated to larger Fe grains. Saturation magnetization, coercivity field and remanent magnetization rapidly reached a stationary value with the milling time. A correlation between the microstructural characteristics of the sample and its magnetic properties before and after reaction is described.

📜 SIMILAR VOLUMES

Influence of the deposition conditions o
Influence of the deposition conditions on the optical, electrical and magnetic properties of sputtered FeAl2O3 and NiAl2O3 nanocermet films
✍ M. Gadenne; P. Gadenne; M.T. Ramdou; J.P. Segaud; H. Lassri; R. Krishnan; C. Sel 📂 Article 📅 1993 🏛 Elsevier Science 🌐 English ⚖ 438 KB

We reveal the influence of the deposition conditions on the physical properties of cermet films made of nanometer sized magnetic metal (# ~/~0) and alumina grains. The films were prepared by r.f. cosputtering under two typical base pressures (10 -6 and 10 -7 Torr), using either an argon plasma or an

Kinetic mechanism for the reaction betwe
Kinetic mechanism for the reaction between methanol and water over a Cu-ZnO-Al2O3 catalyst
✍ C.J. Jiang; D.L. Trimm; M.S. Wainwright; N.W. Cant 📂 Article 📅 1993 🏛 Elsevier Science 🌐 English ⚖ 904 KB

The steam reforming of methanol over a Cu/ZnO/Al,O, catalyst has been investigated. The reaction yields carbon dioxide and hydrogen in the ratio of one to three, with small amounts of dimethyl ether and carbon monoxide being produced at high conversion. Comparison of the rates of methanol dehydrogen