Solid State Science and Technology, Vol. 20, No 1 & 2 (2012) 20-27

ISSN 0128-7389



Pr1-xAExMnO3 (AE = Sr, Ba)

Albert Gan Han Ming*, Lim Kean Pah, Abdul Halim Shaari, Chen Soo Kien,

Zainal Abidin Talib, Wong Jen Kuen and Ng Siao Wei

Department of Physics, Faculty of Science, Universiti Putra Malaysia, 43400 UPM

Serdang, Selangor, Malaysia

*Corresponding author:



Bulk samples of Pr1-xAExMnO3 (AE = Sr, Ba) were prepared through conventional

solid state method. XRD analysis shows that Pr0.67Sr0.33MnO3 (PSMO) and

Pr0.67Ba0.33MnO3 (PBMO) exhibited single phase orthorhombic structure with space

group of Pnma and Imma, respectively. The lattice parameters (a,b,c), Mn-O-Mn bond

angle and volume of the structure increased when smaller Sr atom was replaced with

bigger Ba atom. SEM micrograph shows different grain size with 1.6μm for PBMO and

9.1μm for PSMO. The metal-insulator transition temperature, Tp was found different

where PBMO show double Tp value (150K, 182K), where PSMO give single Tp value

of 286K. The difference is believed to be due to the different phases of the surface and

core of the grain. Typical polycrystalline type of MR behavior (intrinsic accompany

with extrinsic MR effect) is observed. However, the intrinsic effect is more dominant in

both cases. In this study, substitution of various atomic radius in Pr site greatly

influences the structural and electrical properties in Pr0.67(Ba, Sr)0.33MnO3 system.


Keywords: metal-insulator transition temperature; manganese oxide



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