Synthesis and determination of thermodynamical properties of the compounds of the system Ca-Mg-Bi

C. Ramirez, J. A. Romero, A. Hernández, F. Pérez

Research output: Contribution to conferencePaper

2 Scopus citations

Abstract

Bismuth is an element obtained as a sub-product in lead production; Mexico occupies the second position in the world in production of this element. Bismuth is used as iron, aluminum and copper alloying, in the pharmaceutical industry, in the cosmetics industry, etc. Bismuth is separated from lead by the Kroll-Betterton Process in which a Ca-Mg alloy is added to the melting lead to form the intermetallic compounds Ca3Bi2, Mg 3Bi2 and Ca2MgBi2 which float to the surface of the bath. Unfortunately, there is little thermodynamical information of the compounds of the system Ca-Mg-Bi which can be used to study and optimize the Kroll-Betterton process in a theoretical way. In this work there were synthesized the compounds Ca3Bi2, Mg3Bi 2 and CaMg2Bi2 using powders of pure elements (Ca, Mg and Bi) in the required amounts and melted under an inert atmosphere. After synthesis, the samples were characterized by X-Ray Diffraction to ensure the formation of the desire compounds. Later, calorimetric technique was used to determine the thermodynamical properties of the compounds. The results obtained by X-Ray Diffraction show the formation of Mg3Bi2 and Mg2CaBi2 species; however, there is no crystallographic information of the compound Ca3Bi2. The heating curves obtained by calorimetry show endothermic peaks, due to the presence of phases changes as is indicated in the Ca-Bi, Mg-Bi and Ca-Mg-Bi phases diagrams. © 2012 Materials Research Society.
Original languageAmerican English
Pages3-9
Number of pages0
DOIs
StatePublished - 28 May 2013
Externally publishedYes
EventMaterials Research Society Symposium Proceedings -
Duration: 1 Jan 2014 → …

Conference

ConferenceMaterials Research Society Symposium Proceedings
Period1/01/14 → …

Fingerprint Dive into the research topics of 'Synthesis and determination of thermodynamical properties of the compounds of the system Ca-Mg-Bi'. Together they form a unique fingerprint.

  • Cite this

    Ramirez, C., Romero, J. A., Hernández, A., & Pérez, F. (2013). Synthesis and determination of thermodynamical properties of the compounds of the system Ca-Mg-Bi. 3-9. Paper presented at Materials Research Society Symposium Proceedings, . https://doi.org/10.1557/opl.2012.1626