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Static Magnetic Properties of Maghemite Nanoparticles
Zulfiqar,Muneeb Ur Rahman,M. Usman,Syed Khurshid Hasanain,Zia-ur-Rahman,Amir Ullah,Ill Won Kim 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.65 No.11
We report the static magnetic properties of Maghemite (-Fe2O3) nanoparticles with an averagecrystallite size of 14 ± 1.8 nm synthesized via a co-precipitation method. The zero-field-cooled(ZFC) and the field-cooled (FC) magnetization measurements were performed using a physicalproperties measurements system (PPMS) at temperatures from 5 K to 300 K. The ZFC/FC measurementsshowed a typical superparamagnetic behavior with a narrow size distribution.
Amir Ullah,Muneeb-ur-Rahman,Muhammad Javid Iqbal,Chang Won Ahn,Ill Won Kim,Aman Ullah 한국물리학회 2016 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.68 No.12
The electrical properties of the 0.925(Bi0.5(Na0.40K0.10)TiO3-0.075(Ba0.70Sr0.30)TiO3 (0.925BNKT-0.075BST) ceramic were investigated by using AC impedance spectroscopy over a wide range of frequencies (10−2 105 Hz). The X-ray diffraction patterns confirmed the formation of a single-phase compound. A single semicircular arc in the impedance spectrum indicates that the main contribution of the bulk resistance (Rb) were due to grain effects, with Rb decreasing with increasing temperature. The conductivity of the ceramics increased with increasing temperature, and the activation energy resulting from the DC conductivity was 0.86 eV. The ceramic displayed a typical negative temperature coefficient of resistance (NTCR) behavior, like that of a semiconductor.