NDLI: The Effect of Si on the Formation of the <formula formulatype=inline><tex Notation=TeX>${rm La}({rm Fe},{rm Si})_{13}$</tex></formula> Phase Synthesized by the Reduction-Diffusion (R/D) Process

Content Provider	IEEE Xplore Digital Library
Author	Travessini, D. Favero, T.A.C. Teixeira, C.S. Wendhausen, P.A.P.
Copyright Year	1965
Abstract	In this contribution, the influence of Si content on the formation of the of LaFe_(13-x)Si_(x) (1:13 phase) synthesized by the reduction-diffusion (R/D) process is addressed. The raw materials used were Fe and Si, in powder form, La oxide (La₂O₃), and Ca granules as reduction agent. The amount of Si per unit formula, represented by x, was varied from 1.3 to 1.7, for three different compositions. After a leaching step, subsequent to the actual R/D process and necessary to extract the reaction byproducts, such as CaO and nonreacted Ca, an alloy in powder form is obtained, with an average particle size of about 10 μm. In order to know the relative phase-amount evolution with the increasing Si content for these three different alloys, X-ray diffraction (XRD), supported by Rietveld refinement, was performed. Magnetic measurements carried out on a vibrating sample magnetometer (VSM) were used as an alternative means to infer the amount of formed 1:13 phase. The agreement found for the two methods (XRD and VSM) was good and showed that, for predetermined conditions, the amount of 1:13 phase formed, is directly related to the Si content added in powder form, as raw material. Moreover the transition-temperature (TC) of the target 1:13 phase, at which the magnetocaloric effect is highest, was accessed by differential scanning calorimetry (DSC) in order to check homogeneity and stoichiometry deviations from the predicted composition. The different values measured for distinct preparation conditions, point out to different Si contents incorporated to the targeted 1:13 phase, what directly affects phase formation and stability. The well-defined DSC-peaks, however, point out to good phase homogeneity.
Sponsorship	IEEE Magnetics Society
Starting Page	4634
Ending Page	4637
Page Count	4
File Size	980575
File Format	PDF
ISSN	00189464
Volume Number	49
Issue Number	8
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-08-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Silicon Powders Metals Compounds X-ray scattering Lattices reduction-diffusion (R/D) process Magnetocaloric ${\rm La}({\rm Fe},{\rm Si})_{13}$
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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