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Title: Multiferroic Pb<sub>1</sub><sub>-x</sub>Sr<sub>x</sub>(Fe<sub>0.012</sub>Ti<sub>0.988</sub>)O<sub>3</sub> nanoparticles: Room temperature dielectric relaxation, ferroelectricity and ferromagnetism
Authors: Verma, Kuldeep Chand
Ram, Mast
Kotnala, R K
Bhatt, S S
Negi, N S
Keywords: Nanostructures
Chemical synthesis
Electron microscopy
Electrical properties
Magnetic properties
Issue Date: Aug-2010
Publisher: CSIR
Abstract: The effect of particles size and lattice parameters on dielectric constant, ferroelectricity, ferromagnetism and <i style="">dc</i> resistivity of Pb<sub>1</sub><sub>-x</sub>Sr<sub>x</sub>(Fe<sub>0.012</sub>Ti<sub>0.988</sub>)O<sub>3</sub> (PSFT) nanoparticles has been studied at room temperature. The PSFT nanoparticles were prepared by a chemical synthesis route. The X-ray diffraction patterns confirm the phase structure of PSFT nanoparticles. The tetragonal distortion (<i style="">c/a</i>) and particles size have been reduced with increasing Sr<sup>2+</sup> ion substitution. The microstructural behaviour shows the average particle’s size of PSFT specimens which lie in the range of 4-13 nm. The Sr-doped PSFT specimens show higher value of dielectric constant than undoped PFT. At 30 mol% of Sr concentration, the PSFT specimen shows dielectric relaxation up to 18 MHz with ε = 101 and tan '/image/spc_char/delta1.gif' border=0&gt; = 0.075. Also, the maximum value of saturation magnetization, <i style="">M</i><sub>s</sub> = 64.4×10<sup>-3 </sup>emu/g with low magnetic coercive field, <i style="">H</i><sub>c</sub> = 35.9 Oe, and spontaneous polarization, <i style="">P<sub>s</sub></i> = 20.7 μC/cm<sup>2</sup>, remanent polarization, <i style="">P</i><sub>r</sub> = 13.3 μC/cm<sup>2</sup> and electric coercive field, <i style="">E</i><sub>c</sub><i style=""> </i>= 5.7 kV/cm have been observed. Compositional plots between average particle’s size and <i style="">dc</i> resistivity, and dielectric constant and saturation magnetization have been given.
Description: 593-599
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Appears in Collections:IJPAP Vol.48(08) [August 2010]

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