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Electrical properties of $SrBi_2(Nb_0_._7V_0_._3)_2O_9_-_{\delta}$ in the $SrO–Bi_2O_3–0.7Nb_2O_5–0.3V_2O_5–Li_2B_4O_7$ glass system

Venkataraman, Harihara B and Varma, KBR (2006) Electrical properties of $SrBi_2(Nb_0_._7V_0_._3)_2O_9_-_{\delta}$ in the $SrO–Bi_2O_3–0.7Nb_2O_5–0.3V_2O_5–Li_2B_4O_7$ glass system. In: Journal of Non-Crystalline Solids, 352 (6-7). pp. 695-699.

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Glasses in the system $(100-x)Li_2B_4O_7–x(SrO-Bi_2O_3-0.7Nb_2O_5-0.3V_2O_5)$ (where x = 10, 30 and 50, in molar ratio) were fabricated via melt quenching technique. The compositional dependence of the glass transition $(T_g)$ and crystallization $(T_c_r)$ temperatures was determined by differential thermal analysis. The as-quenched glasses on heat-treatment at 783 K for 6 h yielded monophasic crystalline strontium bismuth niobate doped with vanadium $(SrBi_2(Nb_0_._7V_0_._3)_2O_9-_{\delta}$ (SBVN)) in lithium borate (Li2B4O7 (LBO)) glass matrix. The formation of nanocrystalline layered perovskite SBVN phase was preceded by the fluorite phase as established by both the X-ray powder diffraction (XRD) and transmission electron microscopy (TEM). The dielectric constants for both the as-quenched glass and glass–nanocrystal composite increased with increasing temperature in the 300–873 K range, exhibiting a maximum in the vicinity of the crystallization temperature of the host glass matrix. The electrical behavior of the glasses and glass–nanocrystal composites was characterized using impedance spectroscopy.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Elsevier.
Keywords: Crystallization;Glass ceramics;Nanocrystals;Electron diffraction/scattering;X-ray diffraction;Dielectric properties;Relaxation;Electric impedance;Ferroelectric; Nano-composites;Borates;Glass transition
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Depositing User: Sahana R Sahini
Date Deposited: 07 Jun 2006
Last Modified: 19 Sep 2010 04:29
URI: http://eprints.iisc.ac.in/id/eprint/7548

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