Abstract
Transparent glasses in the system (100 − x) (Li2O − 2B2O3) − x (SrO − Bi2O3 − 0.7 Nb2O5 − 0.3 V2O5) (10 ≤ x ≤ 60, in molar ratio) were fabricated via the melt quenching technique. The as-quenched samples were X-ray amorphous. Differential thermal analysis (DTA) confirmed the glassy nature of the as-quenched samples. Strontium bismuth vanadium niobate nanorods were grown by controlled heat-treatment of the as-quenched glasses at 783 K for 6 h. The formation of nanorod layered perovskite SrBi2(Nb0.7V0.3)2O9-δ (SBVN) phase via an intermediate fluorite phase was confirmed by both X-ray powder diffraction (XRD) and transmission electron microscopy (TEM). The dielectric constants of both the as-quenched and heat-treated samples (783 K/6 h) increased while the dielectric loss (D) decreased with increasing x (SBVN content). Interestingly, the dielectric constant of the glass nanocrystal composite (heat-treated at 783 K/6 h) exhibited an anomaly in the vicinity of the crystallization temperature of the host glass (Li2B4O7) reaching a value as high as ≈106 at 800 K. These glass nanocrystal composites were pyroelectric and ferroelectric at 300 K. Communicated by George W. Taylor
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