Dielectric And Magnetic Characterization Of (La0.5-Xprxba0.5)(Mn0.5ti0.5)O3 Perovskite As A Multiferroic Material Synthesized Via Solid State Technique
A new manganate perovskite (La0.5-xPrxBa0.5)(Mn0.5Ti0.5)O3 has been prepared by ceramic solid-state technique at sintering temperature 1300 °C for 24 hours. The x concentration of Praseodymiun (Pr) in molar proportion in A site has been varied as x = 0, 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 007, 0....
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| 主要作者: | |
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| 格式: | Thesis |
| 語言: | English English |
| 出版: |
2009
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| 主題: | |
| 在線閱讀: | http://psasir.upm.edu.my/id/eprint/11970/1/FS_2009_37_A.pdf |
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| 總結: | A new manganate perovskite (La0.5-xPrxBa0.5)(Mn0.5Ti0.5)O3 has been prepared by
ceramic solid-state technique at sintering temperature 1300 °C for 24 hours. The x
concentration of Praseodymiun (Pr) in molar proportion in A site has been varied as
x = 0, 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 007, 0.08, 0.09, 0.1, 0.2, 0.3 and 0.4. The
dielectric properties of the synthesized materials have been studied at frequency
ranging from 5 Hz to 1 MHz from room temperature up to 200 °C. Furthermore,
analyses have been carried out to determine the structural, magnetic and dielectric
electrical properties of the synthesized material as a candidate of multiferroic
material.
Pr (Praseodymium) addition would promote liquid phase sintering in the synthesized
samples. This enhanced the agglomeration and porosity formation in the bulk
volume. The defects and conducting liquid present would generate traps that produce negative permittivity response at interfacial/space charge frequency region
due to delay in transient current or situation in which inertial conducting current of
the trap presents, exceeding the charging-discharging current component. The XRD
(X-Ray Diffractometry) results indicate all samples possess a single phase
monoclinic structure with space group P112. Multiferroic magnetodielectric
coupling in material with ferromagnetic and high dielectric constant ( > 30) is able to
achieve in sampel with x molar concentration = 0.07 at room temperature. The
dielectric value obtained is 176 with loss tan δ value 0.62. SEM/EDX analysis of the
sample shows fine grain microstructure and high manganese (Mn) content ( > 0.6 wt
%) which favours the double exchange mechanism. |
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