Chemically Prepared Fe-B Ultrafine Amorphous Alloy Particles: Influence of the Reaction Time on the Properties

✍ Scribed by Jianyi Shen; Zhiyu Li; Yining Fan; Zheng Hu; Yi Chen

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 438 KB
• Volume: 106
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.1993.1309

✦ Synopsis

Fe-B ultrafine amorphous alloys have been prepared by adding the solution of potassium borohydride into the solution of ferrous sulfate. The reaction process, monitored by the change in (\mathrm{pH}) value during the reaction, and the effect of addition rate of (\mathrm{KBH}{4}) solution, i.e., the reaction time, were investigated. It was found that the reaction system automatically maintains its (\mathrm{pH}) value at about 4.6 and the molar ratio of (\mathrm{KBH}{4}) to (\mathrm{FeSO}{4}) for the equivalent reaction is 1.9 . The boron content increased with the time used for adding (142 \mathrm{ml}) of (\mathrm{KBH}{4}) solution up to about (50 \mathrm{~min}) and then decreased. Generally, the particle size was smaller for high addition rate (e.g. (590 \AA) with (7 \mathrm{sec}) ) and large for low addition rate (e. g. (1370 \AA) with (96 \mathrm{~min}) ). The amorphous structure of the (\mathrm{Fe}-\mathrm{B}) alloys was also found to be different with different reaction time used. 1993 Academic Press, Inc.