Double Peak Behavior of Resistivity-Temperature Curves in (Nd / Pr)0.67Sr0.33MnO3 Manganites

Authors Bharat Singh1, Naresh Kumar2, Masroor Ahmad Bhat1, Rajneesh Mohan3, S. Bhattacharya4, N.K. Gaur1

1 Department of Physics, Barkatullah University, Bhopal – 462026 (M.P.) India

2 Department of Physics, Sidharth Govt. College, Nadaun – 177033 (H.P.) India

3 Department of Mechatronics Engineering, Jeju National University, Jeju 690756, South Korea

4 T.P.P.E.D., Bhabha Atomic Research Centre, Mumbai – 400085 India

Issue Volume 6, Year 2014, Number 2
Dates Received 20 February 2014; revised manuscript received 02 June 2013; published online 20 June 2014
Citation Bharat Singh, Naresh Kumar, Masroor Ahmad Bhat, et al., J. Nano- Electron. Phys. 6 No 2, 02005 (2014)
PACS Number(s) 75.47.Lx
Keywords Manganites (2) , Solid state reaction route, XRD (64) , RT behaviour and SEM.
Annotation We have reported the synthesis of polycrystalline samples of R0.67Sr0.33MnO3 (R  Pr, Nd) from the precursors of PrMnO3, NdMnO3 and SrMnO3 by using solid state reaction method. These samples were sintered at 1200 °C and 1400 °C. Some of samples were also undergone oxygen annealing at 950 °C for 6 h. All the synthesized samples were characterized by X-Ray diffraction (XRD) technique, scanning electron microscopy (SEM) and low temperature resistivity versus temperature (R-T) measurement. The XRD patterns show the monophasic nature of the sintered and annealed samples. The sintered samples of Nd0.67Sr0.33MnO3 has metal- insulator transition at 250 K, while the sample annealed in oxygen shows two peaks, one sharp peak at 250 K and other broad peak at 200 K. The sintered samples of Pr0.67Sr0.33MnO3 has only one peak at 290 K, while the sample annealed in oxygen shows two peaks, one sharp peak at 290 K and another broad peak at 225 K. The two peak behavior in the annealed samples has been explained by inhomogeneous diffusion of oxygen in the core of the grain and at the grain boundaries region.

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