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Study on the structural, spectroscopic, and dielectric properties of 1:2 ordered Ca3(B′Ta2)O9 (B′ = Mg and Zn)

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Abstract

Herein, we report the structural, bonding, dielectric, and electrical transport properties of Ca3(MgTa2)O9 (CMT) and Ca3(ZnTa2)O9 (CZT) with the chemical formula Ca(Mg1/3Ta2/3)O3 and Ca(Zn1/3Ta2/3)O3, respectively, synthesized by the solid-state reaction technique. The Rietveld refinement of powder X-ray diffraction (PXRD) patterns has confirmed that the CMT and CZT are triple perovskites belonging to monoclinic P2 1 /c space group with 1:2 B-site ordering. The unit cell contains four formula units of CMT and CZT. The results of the structural study are corroborated by Fourier transform infrared (FTIR) and Raman spectroscopic studies. Comparing the crystal structures of 1:2 ordered perovskites with the chemical formula Ba(B′1/3B″2/3)O3 and Ca(B′1/3B″2/3)O3, we have predicted that for this group of perovskites, only calcium-based systems exhibit a monoclinic crystal structure of P2 1 /c space group due to the smaller ionic radii of Ca2+ compared to those of Ba2+. The grain size ranges between 0.38 and 2.66 μm for CMT and 0.11 and 1.60 μm for CZT, respectively. The analysis of the dielectric permittivity in the framework of the modified Cole-Cole model has revealed that the dielectric relaxation in CMT and CZT is strongly temperature dependent and polydispersive in nature. The activation energies associated with dielectric and electrical transport properties are ≈0.35 and 0.33 eV for CMT and CZT, respectively. The polaron hopping governs the electrical and dielectric response of the samples. It has been found that CMT and CZT exhibit enhancement in dielectric properties compared to their niobate counterparts and 1:1 ordered tantalum-based perovskite oxides.

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Acknowledgments

We gratefully acknowledge the financial support of CSIR, New Delhi, Government of India, through grant number 60(0106)/13-EMR-II. The authors gratefully acknowledge the financial support of the Department of Science & Technology, Govt. of India through FIST and PURSE program of the Department of Physics, Jadavpur University. The financial assistance granted by UGC, Govt. of India through SAP and UPE program is also acknowledged. We gratefully acknowledge Prof. R. N. Joardar for helpful discussion.

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  1. Department of Physics, Jadavpur University, Kolkata, 700032, India

    Md. Monwar Hoque, A. Barua, Sanjoy Kumar Dey & S. Kumar

  2. Department of Physics, Bose Institute, 93/1, A. P. C. Road, Kolkata, 700009, India

    Alo Dutta & T. P. Sinha

  3. Department of Physics, NITMAS, 24 Paragana(S), 743368, India

    Sanjoy Kumar Dey

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  1. Md. Monwar Hoque
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Hoque, M.M., Barua, A., Dutta, A. et al. Study on the structural, spectroscopic, and dielectric properties of 1:2 ordered Ca3(B′Ta2)O9 (B′ = Mg and Zn). Ionics 23, 471–483 (2017). https://doi.org/10.1007/s11581-016-1916-6

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