Abstract
Nanocrystalline powders of ferroelectric bismuth vanadate, Bi4V2O11 (n-BiV), with crystallite size less than 50 nm, were obtained by mechanical milling of a stoichiometric mixture of bismuth oxide and vanadium pentoxide. The n-BiV powders on sintering yielded high-density, fine-grained ceramics with improved dielectric and polar characteristics. Dielectric studies on samples obtained from milled powders indicated that the ferroelectric-to-paraelectric phase transition temperature is strongly frequency dependent. The Curie–Weiss law is found to be valid only at a temperature away from the transition temperature, confirming the diffused nature of the transition, which is attributed to the presence of compositional inhomogeneity, because of partial reduction of vanadium.
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Shantha, K., Varma, K.B.R. Diffused phase transition in fine-grained bismuth vanadate ceramics. Journal of Materials Research 14, 4651–4656 (1999). https://doi.org/10.1557/JMR.1999.0629
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DOI: https://doi.org/10.1557/JMR.1999.0629