Synthesis and spectroscopic studies of Fe3+-doped zinc borate powder

• Fe3+-doped zinc borate powder has been synthesized.
• From XRD data, crystal structure is monoclinic, average crystalline size evaluated.
• Optical absorption spectrum shows the absorption bands in UV–VIS region.
• EPR studies indicate the site symmetry of Fe3+ ion with host lattice.
• FT-IR spectrum indicates the fundamental vibrations of prepared material.

Fe3+-doped Zn3(BO3)2 powder is synthesized using a co-precipitation method. Powder X-ray diffraction (PXRD), scanning electron microscopy (SEM), optical absorption, electron paramagnetic resonance (EPR), photoluminescence (PL), and Fourier transformation infrared (FTIR) spectroscopy were used to analyze the synthesized sample. The PXRD patterns confirm the monoclinic structure of the as-prepared sample. SEM images reflect the surface morphology of the sample. Energy dispersive X-ray spectroscopy (EDX) data confirms the presence of dopant ions in the host lattice. Crystal field (Dq) and inter-electronic repulsion (B and C) parameters were evaluated. The EPR spectrum shows two resonance signals, at g = 2.12 and 4.36. This indicates the existence of Fe3+ ions in tetragonally distorted octahedral site symmetry. The PL spectrum shows ultraviolet emission at room temperature. FT-IR spectroscopy confirms the fundamental vibrational bands of host molecules.

Zinc borates are very important engineering material which have been widely used in various fields. Fe3+-doped zinc borate powder synthesized by co-precipitation method and characterized by various spectral studies for better understanding the site symmetry, energy levels and bonding nature. From the powder X-ray diffraction peaks reflects the monoclinic crystal structure of the as-prepared material. Optical absorption spectrum shows the absorption bands in UV–VIS region. EPR spectrum of Fe3+-doped Zn3(BO3)2 powder shown in Fig. The spectrum indicates two resonance signals at g = 4.3603 and g = 2.1256 respectively. The bonding between metal ion ligand is ionic nature. PL spectrum shows the UV light at room temperature. IR spectrum exhibits the fundamental vibrations of host lattice.Figure optionsDownload as PowerPoint slide