Solid State Science and Technology, Vol. 14, No 1 (2006) 1-8
EFFECT OF PRASEODYMIUM SUBSTITUTED ON THE STRUCTURAL AND
ELECTRICAL TRANSPORT PROPERTIES OF La0.5Ba0.5MnO3 PEROVSKITE
A. Huda, S.A.Halim, S.Elias, A.A.Sidek, Z.Hishamuddin, K.P.Lim, K.K.Kabashi
Superconductor and Thin Films Laboratory, Department of Physics,
Faculty of Science & Environmental, University Putra Malaysia,
43400 Serdang, Selangor, Malaysia
The influence of praseodymium substituting at La-site in La0.5Ba0.5MnO3 has been
investigated, in magnetotransport and structural properties. The doping Pr at La site on
La-Ba-Mn-O ceramics was using solid state reaction. Polycrystalline (La1-x
Prx)0.5Ba0.5MnO3 (x = 0, 0.167, 0.33, 0.5, 0.67, 0.833, 1) is doped with Pr site based
manganites, calcined at 900oC for 12 hours, pelletized and sintered at 1300oC for 24
hours have been synthesized and investigated. The electrical property, Tp was
determined by using standard four-point probe resistivity measurement in a temperature
range of 30 K to 300 K. With increasing the Pr doping, Tp for the films shifted to lower
temperatures, which are 254, 248, 228, 220, 196, 180, 158 K for the bulks with x = 0,
0.167, 0.33, 0.5, 0.67, 0.833, 1, respectively. As the Praseodymium concentration
increases, the metal-insulator transition temperature (Tp) decreases while the activation
energy in the insulating region (T > Tp) and resistivity increases. The structural property
of bulk samples have been investigated via X-Ray Diffragtometer (XRD). XRD patterns
show that these systems are in single-phase. The lattice parameters of undoped sample,
La0.5Ba0.5MnO3 can be observed at, a ≈ 15.120 Ĺ, b ≈ 7.776Ĺ and c ≈ 4.335Ĺ. All the
samples are in orthorhombic distortion perovskite structure with a > b > c. The unit cell
volume decreases as Pr concentration increases.
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