Thermal diffusivity and related properties of colossal magnetoresistive La0.67Ca0.33MnO3 with various grain sizes

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Abstract

Using the open-cell photoacoustic technique, we have measured the room-temperature thermal diffusivities of the colossal magnetoresistive material La0.67Ca0.33MnO3, sintered between 1100 °C and 1350 °C, with average grain sizes 1, 3, 5, and 10 μm. We obtained the thermal diffusivities by analyzing the phase of photoacoustic signals in thermally thick samples using Calderon's method. We found that the insulator-metal transition temperature does not depend on the grain size ($Trm IM} ∼ 272$ K). However, the thermal diffusivity increases with grain size, with values between 0.431 and 0.969 mm2s-1. Other related electrical and thermal properties, including the electrical conductivity, thermal conductivity, and phonon mean free path, are also dependent on the grain size. The electronic contribution to the thermal conductivity is 2%3% of the total thermal conductivity for smaller grain sizes (15 μm) and increases to about 24% when the grain size is increased to 10 $\mu$ m.

Original languageEnglish
Article number5089915
Pages (from-to)2899-2901
Number of pages3
JournalIEEE Transactions on Magnetics
Volume45
Issue number7
DOIs
Publication statusPublished - Jul 2009

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Thermal diffusivity
Thermal conductivity
Photoacoustic effect
Superconducting transition temperature
Electric properties
Thermodynamic properties
Metals
Temperature

Keywords

  • Grain size
  • Manganites
  • Open-cell photoacoustic
  • Thermal diffusivity

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials

Cite this

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title = "Thermal diffusivity and related properties of colossal magnetoresistive La0.67Ca0.33MnO3 with various grain sizes",
abstract = "Using the open-cell photoacoustic technique, we have measured the room-temperature thermal diffusivities of the colossal magnetoresistive material La0.67Ca0.33MnO3, sintered between 1100 °C and 1350 °C, with average grain sizes 1, 3, 5, and 10 μm. We obtained the thermal diffusivities by analyzing the phase of photoacoustic signals in thermally thick samples using Calderon's method. We found that the insulator-metal transition temperature does not depend on the grain size ($Trm IM} ∼ 272$ K). However, the thermal diffusivity increases with grain size, with values between 0.431 and 0.969 mm2s-1. Other related electrical and thermal properties, including the electrical conductivity, thermal conductivity, and phonon mean free path, are also dependent on the grain size. The electronic contribution to the thermal conductivity is 2{\%}3{\%} of the total thermal conductivity for smaller grain sizes (15 μm) and increases to about 24{\%} when the grain size is increased to 10 $\mu$ m.",
keywords = "Grain size, Manganites, Open-cell photoacoustic, Thermal diffusivity",
author = "Alwi, {Hasan Adli} and {Abd. Shukor}, Roslan",
year = "2009",
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language = "English",
volume = "45",
pages = "2899--2901",
journal = "IEEE Transactions on Magnetics",
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publisher = "Institute of Electrical and Electronics Engineers Inc.",
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TY - JOUR

T1 - Thermal diffusivity and related properties of colossal magnetoresistive La0.67Ca0.33MnO3 with various grain sizes

AU - Alwi, Hasan Adli

AU - Abd. Shukor, Roslan

PY - 2009/7

Y1 - 2009/7

N2 - Using the open-cell photoacoustic technique, we have measured the room-temperature thermal diffusivities of the colossal magnetoresistive material La0.67Ca0.33MnO3, sintered between 1100 °C and 1350 °C, with average grain sizes 1, 3, 5, and 10 μm. We obtained the thermal diffusivities by analyzing the phase of photoacoustic signals in thermally thick samples using Calderon's method. We found that the insulator-metal transition temperature does not depend on the grain size ($Trm IM} ∼ 272$ K). However, the thermal diffusivity increases with grain size, with values between 0.431 and 0.969 mm2s-1. Other related electrical and thermal properties, including the electrical conductivity, thermal conductivity, and phonon mean free path, are also dependent on the grain size. The electronic contribution to the thermal conductivity is 2%3% of the total thermal conductivity for smaller grain sizes (15 μm) and increases to about 24% when the grain size is increased to 10 $\mu$ m.

AB - Using the open-cell photoacoustic technique, we have measured the room-temperature thermal diffusivities of the colossal magnetoresistive material La0.67Ca0.33MnO3, sintered between 1100 °C and 1350 °C, with average grain sizes 1, 3, 5, and 10 μm. We obtained the thermal diffusivities by analyzing the phase of photoacoustic signals in thermally thick samples using Calderon's method. We found that the insulator-metal transition temperature does not depend on the grain size ($Trm IM} ∼ 272$ K). However, the thermal diffusivity increases with grain size, with values between 0.431 and 0.969 mm2s-1. Other related electrical and thermal properties, including the electrical conductivity, thermal conductivity, and phonon mean free path, are also dependent on the grain size. The electronic contribution to the thermal conductivity is 2%3% of the total thermal conductivity for smaller grain sizes (15 μm) and increases to about 24% when the grain size is increased to 10 $\mu$ m.

KW - Grain size

KW - Manganites

KW - Open-cell photoacoustic

KW - Thermal diffusivity

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