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Ceramics; infrared spectroscopy; surface morphology; transmission electron microscopy.

Nanocrystalline Ba₂NdSbO₆, a complex cubic perovskite metal oxide, powders were synthesized by a self-sustained combustion method employing citric acid. The product was characterized by X-ray diffraction, differential thermal analysis, thermogravimetric analysis, Fourier transform infrared spectroscopy, transmission electron microscopy and scanning electron microscopy. The as-prepared powders were single phase Ba₂NdSbO₆ and a mixture of polycrystalline spheroidal particles and single crystalline nanorods. The Ba₂NdSbO₆ sample sintered at 1500°C for 4 h has high density (∼ 95% of theoretical density). Sintered nanocrystalline Ba₂NdSbO₆ had a dielectric constant of ∼ 21; and dielectric loss = 8 × 10^-3 at 5 MHz.

V T Kavitha¹ R Jose² S Ramakrishna² P R S Wariar¹ J Koshy¹

1. Department of Physics, University College, Thiruvananthapuram 695 034, India
2. National University of Singapore, Singapore 117576

Published

July 2011

Manuscript received

4 October 2009

Manuscript revised

19 November 2009