Electrochemical Formation of Ca-Si in Molten CaCl2-KCl. Issue 4 (1st January 2015)

• Record Type: Journal Article
• Authors: Sakanaka, Y.; Goto, T.; Hachiya, Kan
• Is Part Of: Journal of the Electrochemical Society. Volume 162:Issue 4(2015)
• Page Start: D186
• Page End: D191
• Publication Date: 2015-01-01
• Subjects: Electrochemistry -- Periodicals; 541.3705
• DOI: 10.1149/2.1021504jes
• Languages: English
• ISSNs: 0013-4651

Abstract

Abstract : Electrochemical formation of a Ca-Si film in a molten CaCl2 -KCl at 923 K was investigated. Potentiostatic electrolysis of a Si electrode at −0.10 V for 1 h resulted in the formation of a multiphase Ca-Si film having a thickness of about 30 μm. The Ca-Si film was converted into other alloy phases by anodic potentiostatic electrolysis after the cathodic electrodeposition of Ca metal at −0.10 V. The various transformation reactions and the corresponding equilibrium potentials were clarified. At 923 K, the equilibrium potential was found to be 0.18 V (CaSi2 ). Reflectance measurements in the ultraviolet, visible, and near-infrared region clarified that the CaSi2 film has a direct bandgap of 3.1 eV.