Effect of pH Variation on Structural and Dielectric Properties of Co-precipitated Nanostructured Multiferroic BiFeO3

作者：Shami M Yasin^*; Awan M S; Anis ur Rehman M

来源：Journal of Superconductivity and Novel Magnetism, 2013, 26(4): 1071-1074.

DOI：10.1007/s10948-012-1856-y

• Multiferroics
• BiFeO3
• pH variation
• Co-precipitation
• Dielectric constant

Phase pure multiferroic BiFeO3 (BFO) was prepared by the co-precipitation technique using diverse precursors at a temperature as low as 400 A degrees C. The dependence of structural and dielectric properties was investigated with the variation of pH (8-13, with steps of 1). Uniaxially pressed powders were sintered in air at 500 A degrees C for 2 h. X-ray diffraction analysis determined the amorphous nature of the as-synthesized samples and the perovskite nature of the sintered samples. The crystal structure obtained from the lattice parameters of the BFO specimens was R3c hexagonal. The fractional porosity of the pellets was determined from the measured and theoretical density of the samples. The crystallite size varies from 48-62 nm with the variation of the pH value. SEM micrographs exhibited a grain morphology and a wide size distribution. The dielectric constant, loss tangent, and ac conductivity of the pellets were measured as a function of frequency (20 Hz-3 MHz). A high dielectric constant and dissipation factor for the sample prepared with pH=10 was observed in the low frequency range.

• 出版日期2013-4