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The effect of Ho addition on electrical transport properties of LCMO" / Noorhasimah Yeop

This research is done to measure the "Effect of Holmium addition on the electrical transport properties of polycrystalline LCMO manganite". The different value of Ho which is at x = 0.00, 0.15, 0.30 was added to LCMO and grind it to make them mixed together. After that the entire sample wa...

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Main Author: Yeop, Noorhasimah
Format: Student Project
Language:English
Published: 2009
Subjects:
Electricity
Electric current (General)
Online Access:https://ir.uitm.edu.my/id/eprint/46838/1/46838.pdf
https://ir.uitm.edu.my/id/eprint/46838/
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spelling my.uitm.ir.468382022-11-23T03:20:38Z https://ir.uitm.edu.my/id/eprint/46838/ The effect of Ho addition on electrical transport properties of LCMO" / Noorhasimah Yeop Yeop, Noorhasimah Electricity Electric current (General) This research is done to measure the "Effect of Holmium addition on the electrical transport properties of polycrystalline LCMO manganite". The different value of Ho which is at x = 0.00, 0.15, 0.30 was added to LCMO and grind it to make them mixed together. After that the entire sample was calcine at 900°C for 12 hours at the rate 3°C per minute. Then the sample was press to make it into a pellet and sinter at 1300°C. Then this sample was measure by using instruments such as four point probe and scanning electron microscope. I found that, the electrical resistivity as a function of temperature at zero field, p(0,T) for (Lai.xHox)o.67Cao.33Mn03 for x = 0.00,0.15,0.30 show semiconducting behavior above Tp and metallic behavior below Tp by usng four point probe. With increasing Ho doping, the metal-insulator transition temperature Tp shift to lower temperature and the resisitivity is increase which is for x = 0.00, TMI is 256 K with resistivity value 1.48 mQ.cm. While for x = 0.15, TMI was observed at 152 K with resistivity value 66.5 rafl.cm. For sample x = 0.30, TMI is 140 K with resistivity value 214 mfl.cm. the transport mechanism also can be explained by Double Exchange mechanism, Jahn Teller effect.and Jahn Teller polaron. The investigation of the grain size and examination of the composition of sample was done by using a Scanning electron microscope. It found that the Ho is coexisting with the pure LCMO. When the adding of Holmium is increasing, the brightness which is representing the Holmium is more clear to seen. 2009 Student Project NonPeerReviewed text en https://ir.uitm.edu.my/id/eprint/46838/1/46838.pdf The effect of Ho addition on electrical transport properties of LCMO" / Noorhasimah Yeop. (2009) [Student Project] (Unpublished)
institution Universiti Teknologi Mara
building Tun Abdul Razak Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Mara
content_source UiTM Institutional Repository
url_provider http://ir.uitm.edu.my/
language English
topic Electricity
Electric current (General)
spellingShingle Electricity
Electric current (General)
Yeop, Noorhasimah
The effect of Ho addition on electrical transport properties of LCMO" / Noorhasimah Yeop
description This research is done to measure the "Effect of Holmium addition on the electrical transport properties of polycrystalline LCMO manganite". The different value of Ho which is at x = 0.00, 0.15, 0.30 was added to LCMO and grind it to make them mixed together. After that the entire sample was calcine at 900°C for 12 hours at the rate 3°C per minute. Then the sample was press to make it into a pellet and sinter at 1300°C. Then this sample was measure by using instruments such as four point probe and scanning electron microscope. I found that, the electrical resistivity as a function of temperature at zero field, p(0,T) for (Lai.xHox)o.67Cao.33Mn03 for x = 0.00,0.15,0.30 show semiconducting behavior above Tp and metallic behavior below Tp by usng four point probe. With increasing Ho doping, the metal-insulator transition temperature Tp shift to lower temperature and the resisitivity is increase which is for x = 0.00, TMI is 256 K with resistivity value 1.48 mQ.cm. While for x = 0.15, TMI was observed at 152 K with resistivity value 66.5 rafl.cm. For sample x = 0.30, TMI is 140 K with resistivity value 214 mfl.cm. the transport mechanism also can be explained by Double Exchange mechanism, Jahn Teller effect.and Jahn Teller polaron. The investigation of the grain size and examination of the composition of sample was done by using a Scanning electron microscope. It found that the Ho is coexisting with the pure LCMO. When the adding of Holmium is increasing, the brightness which is representing the Holmium is more clear to seen.
format Student Project
author Yeop, Noorhasimah
author_facet Yeop, Noorhasimah
author_sort Yeop, Noorhasimah
title The effect of Ho addition on electrical transport properties of LCMO" / Noorhasimah Yeop
title_short The effect of Ho addition on electrical transport properties of LCMO" / Noorhasimah Yeop
title_full The effect of Ho addition on electrical transport properties of LCMO" / Noorhasimah Yeop
title_fullStr The effect of Ho addition on electrical transport properties of LCMO" / Noorhasimah Yeop
title_full_unstemmed The effect of Ho addition on electrical transport properties of LCMO" / Noorhasimah Yeop
title_sort effect of ho addition on electrical transport properties of lcmo" / noorhasimah yeop
publishDate 2009
url https://ir.uitm.edu.my/id/eprint/46838/1/46838.pdf
https://ir.uitm.edu.my/id/eprint/46838/
_version_ 1751539834787201024
score 13.211869

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