Citation
Shaari, Abdul Halim and A., Huda and Lim, Kean Pah and Lee, Oon Jew and Saion, Elias and Wan Yusoff, Wan Mohd Daud and Cik, Abdulah
(2004)
Effect of Pr substitution on magnetoresistance in La23/Ba13/MnO3 perovskite.
In: IEEE International Conference on Semiconductor Electronics (ICSE 2004), 7-9 Dec. 2004, Kuala Lumpur, Malaysia. (pp. 497-502).
Abstract
Polycrystalline of (La1-xPrx)0.67Ba0.33MnO3 with x = 0, 0.167, 0.33, 0.5, 0.67, 0.833, 1 have been prepared using solid state reaction. The effect of substituting praseodymium at La-site on magnetoresistance (MR) effect has been investigated. The electrical property, was determined by using standard four-point probe resistivity measurement in a temperature range of 30 K to 300 K. Metal-insulator transition temperature (Tp) shifted to lower temperatures with the increases of Pr doping with the value of >300, 270, 250, 226, 202, 186 and 158 K for x = 0, 0.167, 0.33, 0.5, 0.67, 0.833, 1, respectively. Overall, MR drops slowly when temperature rises. All doping concentration give small variation range (5% to 25%) except for x=1.0, where this sample show significantly higher MR value at all temperature as compared to other samples. The highest MR value of 38% is observed at 270K. In the semiconducting portion, activation energy (Ea) has been investigated. The Ea increases as the doping concentration increases.
Download File
Additional Metadata
Actions (login required)
 |
View Item |
