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Structural and optical properties of zinc titanates synthesized by precipitation method

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Abstract

Synthesis of zinc titanates was carried out using a simple precipitation method followed by calcination at different temperatures to obtain different phases of the material. The phase transition characteristics, presence of functional groups, structural aspects and optical bandgaps with respect to calcination temperature were studied by thermal analysis, EDAX, FT-IR, powder XRD, Raman and UV-Vis spectroscopy respectively. The compound on heat treatment at 100∘C for 24 h showed broadened peaks in XRD. With increasing temperature of calcination, the compound appeared to turn to crystalline phase and cubic ZnTiO3 phase was observed at 600∘C. Partial phase transformation of cubic phase ZnTiO3 into hexagonal ilmenite type ZnTiO3 was observed in the temperature range 700∘C to 900∘C. At 1000∘C both cubic and hexagonal ilmenite phases decomposed into cubic phase Zn2TiO 4 and rutile TiO2. FT-IR showed M-O bonds in the range of 400 cm −1 to 700 cm −1. Raman spectra of cubic defect spinel ZnTiO3 and cubic inverse spinel Zn2TiO4 were found to be similar. The optical bandgap calculated using diffuse reflectance spectra was found to be in the range of 3.59 to 3.84 eV depending on calcination temperature.

Zinc titanates were synthesized by a simple precipitation reaction and characterized using thermal analysis, EDAX, powder XRD, FT-IR, Raman and DRS studies. Calcination temperature influences phase transition and optical properties. Raman spectra of cubic ZnTiO3 and cubic Zn2TiO4 are similar due to similarity in their crystal structure and lattice parameters.

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Acknowledgments

The authors thank VIT-SIF for thermal analysis, powder XRD, FT-IR and DRS, and Dr. R.P. Vijayalakshmi, Sri Venkateswara University, Tirupati for Raman spectral data. One of the authors, B. Lokesh thanks VIT University for providing financial support to carry out the present work.

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Authors and Affiliations

  1. Thin Films Laboratory, Materials Physics Division, School of Advanced Sciences, VIT University, Vellore, 632 014, Tamil Nadu, India

    LOKESH BUDIGI, MADHUSUDHANA RAO NASINA & KALEEMULLA SHAIK

  2. School of Advanced Sciences, VIT University, Vellore, 632 014, Tamil Nadu, India

    SIVAKUMAR AMARAVADI

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  1. LOKESH BUDIGI
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  2. MADHUSUDHANA RAO NASINA
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Correspondence to MADHUSUDHANA RAO NASINA.

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BUDIGI, L., NASINA, M.R., SHAIK, K. et al. Structural and optical properties of zinc titanates synthesized by precipitation method. J Chem Sci 127, 509–518 (2015). https://doi.org/10.1007/s12039-015-0802-5

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  • DOI: https://doi.org/10.1007/s12039-015-0802-5

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