1Department of Physics, M. L. Sukhadia University, Udaipur 313002, Rajasthan, India
2Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617, Taiwan
Adv. Mater. Lett., 2014, 5 (3), pp 122-126
Publication Date (Web): Feb 02, 2014
Copyright © IAAM-VBRI Press
Polycrystalline ceramic samples of pure and Cu+2 doped Bi4V2-xCuxO11(x=0.0 and 0.02) have been synthesized by standard solid state reaction method using high purity oxides. The dielectric constant and dielectric loss and hence ac conductivity as a function of frequency and temperature have been measured. The dielectric studies indicate that the material is highly lossy and hence its ac conductivity increases with the increase of temperature. The dc conductivity of material has been measured as a function of temperature from room temperature to 653 K and its activation energy was calculated using the relation σ = σo exp (- Ea/kT). The dc conductivity increases with the substitution of Cu on the vanadium site. The Modulated Differential Scanning Calorimetry (MDSC) has been used to investigate the effect of substitution on the phase transition of the compounds. The results are discussed in detail.
Ferroelectrics, X-ray diffraction, dielectrics, electrical conductivity, MDSC.