Structural and electrical transport of Lа₁₋ₓCaₓMnO₃ with substitution x=0.00, 0.50 and 1.00 / Kamariah Noor Ab Kahar

Ab Kahar, Kamariah Noor (2009) Structural and electrical transport of Lа₁₋ₓCaₓMnO₃ with substitution x=0.00, 0.50 and 1.00 / Kamariah Noor Ab Kahar. [Student Project] (Unpublished)

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Abstract

The effect of calcium (Ca) substitution on the CMR properties of La i-x Ca x MnC>3 (LCMO) was systematically studied. Samples were synthesized using a standard solid state reaction technique by substituting concentration Ca up to 100%. The micro structure for samples 0%, 50% and 100% was characterized by Scanning Electron Microscope (SEM) using LEO 14551 VPSEM Gemini Scanning Electron Microscope. The micro structure were found are change which the grain size little bit more large as increase the substitution of concentration of Ca. With the increase of concentration Ca substitution, the phase transition temperature determined by standard four-probe method measurement increased to 290K for x=0.50, then dropped sharply with higher Ca concentration because the change in double exchange mechanism (DE) and Jahn-Teller distortion (JT). Results are discussed in the relation with decreasing with as an amount of the Ca substituted. The values of resistivity are increase in the LCMO with higher-level concentration (x> 50%) in the substitution of Ca substituted to the samples.

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Item Type: Student Project
Creators:
Creators
Email
Ab Kahar, Kamariah Noor
UNSPECIFIED
Contributors:
Contribution
Name
Email / ID Num.
Thesis advisor
Mohamed, Zakiah
UNSPECIFIED
Subjects: T Technology > TA Engineering. Civil engineering > Structural engineering
T Technology > TA Engineering. Civil engineering > Structural engineering > Structural analysis. Theory of structures
Divisions: Universiti Teknologi MARA, Shah Alam > Faculty of Applied Sciences
Programme: Bachelor of Science (Hons.) Physics
Item ID: 44018
Uncontrolled Keywords: Structural, Electrical transport, Micro structure
URI: https://ir.uitm.edu.my/id/eprint/44018

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