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Dielectric relaxation and phonon modes of NdCrO3 nanostructure

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Abstract

The neodymium chromate nanoparticles are synthesized by the sol–gel process. The phase formation with Pnma symmetry of the sample is confirmed by the Rietveld refinement of X-ray diffraction data. The particle size of the sample is determined by transmission electron microscopy. The band gap of the material is found to be 1.78 eV which is obtained by Tauc relation to UV-absorption spectrum. The room temperature Raman spectrum is fitted with the sum of 22 Lorentzian peaks. Dielectric relaxation of the sample has been investigated in the frequency range from 42 Hz to 1.1 MHz and in the temperature range from 303 to 573 K. The Cole–Cole model is used to explain the dielectric relaxation mechanism of the material. The complex impedance plane plot confirms the existence of the grain-boundary contribution to the relaxation of the sample. The frequency-dependent conductivity spectra follow the power law.

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Acknowledgments

Sujoy Saha acknowledges the financial support provided by the UGC New Delhi in the form of SRF. Alo Dutta thanks to Department of Science & Technology of India for providing the financial support through DST Fast Track Project under Grant No. SR/FTP/PS–032/2010. This work was financially supported by the Defense Research and Development Organization of Govt. of India, New Delhi. The authors acknowledge Dr. P. Singha Deo of S.N. Bose National Center for Basic Sciences, Kolkata, India for taking TEM micrographs. The authors acknowledge the academic discussions made with Prof. R. K. Mondal of the Department of Metallurgical Engineering, Indian Institute of Technology, Benaras Hindu University, Varanasi, India.

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  1. Department of Physics, Bose Institute, 93/1 Acharya Prafulla Chandra Road, Kolkata, 700009, India

    Sujoy Saha, Sadhan Chanda, Alo Dutta & T. P. Sinha

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  1. Sujoy Saha
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  2. Sadhan Chanda
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  3. Alo Dutta
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  4. T. P. Sinha
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Correspondence to Sujoy Saha.

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Saha, S., Chanda, S., Dutta, A. et al. Dielectric relaxation and phonon modes of NdCrO3 nanostructure. J Sol-Gel Sci Technol 69, 553–563 (2014). https://doi.org/10.1007/s10971-013-3256-6

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