In situ high-temperature X-Ray diffraction study of tantalum metal

Article type: Research Article

Authors: SI-Ahmed, Fariza^a | Afir, Arezki^a | Pialoux, André^b | Chikh, Houria^{a; *}

Affiliations: [a] Laboratoire de Cristallographie-Thermodynamique, Faculté de Chimie, Université des Sciences et de la Technologie Houari Boumediene, BP32, Al Alia 16111, Alger, Algérie | [b] Laboratoire de chimie générale, Bâtiment 462, Université Paris-Saclay, 91405 Orsay CEDEX, France

Correspondence: [*] Corresponding author: Laboratoire de Cristallographie-Thermodynamique, Faculté de Chimie, Université des Sciences et de la Technologie Houari Boumediene, BP32, Al Alia 16111, Alger, Algérie. E-mails: [email protected], [email protected].

Abstract: An in-situ thermal behavior study was conducted on the metallic tantalum under two conditions. The experimentation was carried out on tantalum pellets which were heated progressively “underwent reaction and under continuous pumping or under controlled monoxide pressure” in a graphite resistance high temperature X-ray diffractometer up to 2300 K. Through the in-situ study, a thermodynamic analysis showed that this involved the formation of Ta2O, Ta2O5 (low temperature modification) and Ta2C likely to be formed between 293 and 2300 K, in agreement with a reaction mechanism that we established to occur in four stages.

Keywords: Solid state reaction, thermal expansion, X-Ray methods, tantalum carbide, Ta-O-C phases diagram

DOI: 10.3233/MGC-220105

Journal: Main Group Chemistry, vol. 22, no. 3, pp. 453-467, 2023