Raman spectroscopy of nickel molybdate and its modifications

Abstract

While using hydrothermal method we obtained nanocrystal nickel molybdate hydrate (NiMoO₄). Its further calcination at 400 °C enabled us to obtain α-phase of NiMoO₄ hydrate. The modification of physical and chemical properties of prepared NiMoO₄ hydrate was being done with the aid of powerful laser radiation with the further composite formation on its basis. We have established the interconnection of vibrational modes of triclinic and monoclinic structures of nickel molybdates with corresponding bands in Raman spectra. We established that registered intensive bands with maximum 947, 870, 828, and 354 cm⁻¹ correspond to vibrational modes of МоО₄ tetrahedrons of NiMoO₄ hydrates, while intensive bands with maximum 960, 912, and 706 cm⁻¹ in α-NiMoO₄ correspond to stretching vibrational modes in Мo–О and О–Мo–О, bending modes О–Мo–О connections in MoO₆ octahedron.

Keywords:

• Raman spectroscopy
• nanomaterials
• nickel molybdate
• carbon material
• laser irradiation

Additional information

Funding

This research was supported by the National Research Foundations of Ukraine [Project No.2020.02/0043].