Solid State Science and Technology, Vol. 14, No 1 (2006) 1-8

ISSN 0128-7389

1

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

 

ABSTRACT

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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