Structural and optical properties of magnesium nitride formed by a novel electrochemical process

The electrochemical formation of magnesium nitride (Mg 3N 2) films in LiCl–KCl containing Li 3N at 723 K was investigated. From a thermodynamic point of view, a potential- pN 3− diagram was constructed for the Mg–N system in an analogous fashion to Pourbaix diagrams for aqueous solutions. As a resul...

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Bibliographic Details
Published in:Electrochimica acta 2005-10, Vol.51 (1), p.56-60
Main Authors: Toyoura, Kazuaki, Goto, Takuya, Hachiya, Kan, Hagiwara, Rika
Format: Article
Language:English
Subjects:
Bandgap
Chemistry
Electrochemical formation
Electrochemistry
Exact sciences and technology
General and physical chemistry
High temperature electrochemistry (including molten salts)
Mg 3N 2
Molten salt
Optical property
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Summary:The electrochemical formation of magnesium nitride (Mg 3N 2) films in LiCl–KCl containing Li 3N at 723 K was investigated. From a thermodynamic point of view, a potential- pN 3− diagram was constructed for the Mg–N system in an analogous fashion to Pourbaix diagrams for aqueous solutions. As a result, the thermodynamically stable region of Mg 3N 2 in LiCl–KCl–Li 3N was identified. XRD analysis revealed that Mg 3N 2 film was obtained by potentiostatic electrolysis of a magnesium electrode between 0.4 and 0.8 V (versus Li +/Li), and the structure of obtained Mg 3N 2 was anti-bixbyite ( a = 1.001 nm). Reflectance measurements clarified that assuming direct transition, the bandgap energy was 3.15 eV and assuming indirect transition, the bandgap energy was 2.85 eV.
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2005.04.004