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Issue 44, 2013
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Synthesis, structural and optical properties of nanocrystalline Ba2NaNb5O15

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Abstract

Fine powders comprising nanocrystallites of barium sodium niobate, Ba2NaNb5O15 (BNN) were obtained via a citrate assisted sol–gel route at a much lower temperature than that of the conventional solid-state reaction route. The phase evolution of BNN as a function of temperature was investigated by thermogravimetric analysis (TGA), differential thermal analysis (DTA), Fourier transform infrared spectroscopy (FTIR) and X-ray powder diffraction (XRD). DTA data followed by XRD studies confirmed the BNN formation temperature to be around 923 K. The as-synthesized powders heat-treated at 923 K/10 h attained an orthorhombic structure akin to that of the parent BNN phase. Transmission electron microscopy revealed that the nanocrystallites are associated with dislocations. The optical band gap was calculated using the Kubelka–Munk function. These nanocrystallites exhibited strong visible photoluminescence (PL) at room temperature. The PL mechanism was explained by invoking the dielectric confinement effect, defect states and generation of self-trapped excitons.

Graphical abstract: Synthesis, structural and optical properties of nanocrystalline Ba2NaNb5O15

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Publication details

The article was received on 27 Jun 2013, accepted on 02 Sep 2013 and first published on 04 Sep 2013


Article type: Communication
DOI: 10.1039/C3CE41250D
Citation: CrystEngComm, 2013,15, 8887-8893
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    Synthesis, structural and optical properties of nanocrystalline Ba2NaNb5O15

    S. Kundu and K. B. R. Varma, CrystEngComm, 2013, 15, 8887
    DOI: 10.1039/C3CE41250D

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