Thermal, Electrical and Microstructural Characterization of Sno2-Based Ceramic Composites

In this work, the photoflash and two-probe technique were used to measure thermal diffusivity and electrical conductivity, respectively, on tin (IV) oxide-based gas sensor materials i.e. SnO2/CuO and SnO2/ZnO samples. All measurements were made at room temperature. It was found that the thermal dif...

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Main Author:	Mas’ut, Aiza Masyati
Format:	Thesis
Language:	English English
Published:	2008
Subjects:	Thermal diffusivity - Measurement Ceramics - Microstructure
Online Access:	http://psasir.upm.edu.my/id/eprint/5173/1/FS_2008_48a.pdf
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spelling	my-upm-ir.51732013-05-27T07:20:55Z Thermal, Electrical and Microstructural Characterization of Sno2-Based Ceramic Composites 2008 Mas’ut, Aiza Masyati In this work, the photoflash and two-probe technique were used to measure thermal diffusivity and electrical conductivity, respectively, on tin (IV) oxide-based gas sensor materials i.e. SnO2/CuO and SnO2/ZnO samples. All measurements were made at room temperature. It was found that the thermal diffusivity value of pure SnO2 was 1.45 × 10-2 cm2s-1. The thermal diffusivity of SnO2/CuO ceramic composites with addition of up to 30 mole% CuO increases to 7.50 × 10-2 cm2s-1 but further additions of CuO decrease the thermal diffusivity value to 6.21 × 10-2 cm2s-1. For SnO2/ZnO ceramic composites, the thermal diffusivity is in the range of 1.01 to 2.62 × 10-2 cm2s-1. Changes of the grain size or changes of the porosity volume have been suggested to be responsible for the variation in the thermal diffusivity behavior and this was supported by SEM micrographs. The electrical resistivity of pure SnO2 was found to be 2.11 × 101 Ωcm. Both SnO2/CuO and SnO2/ZnO ceramic composites indicated that their electrical resistivity values were in the range of 4.067 × 105 Ωcm to 8.667 × 106 Ωcm and 2.739 × 105 Ωcm to 5.650 × 106 Ωcm, respectively. Their electrical resistivity trends were actually decrease with increasing additions of either CuO or ZnO. The variation in the electrical resistivity of these samples has been explained based on the changes of free electron concentration. Thermal diffusivity - Measurement Ceramics - Microstructure 2008 Thesis http://psasir.upm.edu.my/id/eprint/5173/ http://psasir.upm.edu.my/id/eprint/5173/1/FS_2008_48a.pdf application/pdf en public masters Universiti Putra Malaysia Thermal diffusivity - Measurement Ceramics - Microstructure Science English
institution	Universiti Putra Malaysia
collection	PSAS Institutional Repository
language	English English
topic	Thermal diffusivity - Measurement Ceramics - Microstructure
spellingShingle	Thermal diffusivity - Measurement Ceramics - Microstructure Mas’ut, Aiza Masyati Thermal, Electrical and Microstructural Characterization of Sno2-Based Ceramic Composites
description	In this work, the photoflash and two-probe technique were used to measure thermal diffusivity and electrical conductivity, respectively, on tin (IV) oxide-based gas sensor materials i.e. SnO2/CuO and SnO2/ZnO samples. All measurements were made at room temperature. It was found that the thermal diffusivity value of pure SnO2 was 1.45 × 10-2 cm2s-1. The thermal diffusivity of SnO2/CuO ceramic composites with addition of up to 30 mole% CuO increases to 7.50 × 10-2 cm2s-1 but further additions of CuO decrease the thermal diffusivity value to 6.21 × 10-2 cm2s-1. For SnO2/ZnO ceramic composites, the thermal diffusivity is in the range of 1.01 to 2.62 × 10-2 cm2s-1. Changes of the grain size or changes of the porosity volume have been suggested to be responsible for the variation in the thermal diffusivity behavior and this was supported by SEM micrographs. The electrical resistivity of pure SnO2 was found to be 2.11 × 101 Ωcm. Both SnO2/CuO and SnO2/ZnO ceramic composites indicated that their electrical resistivity values were in the range of 4.067 × 105 Ωcm to 8.667 × 106 Ωcm and 2.739 × 105 Ωcm to 5.650 × 106 Ωcm, respectively. Their electrical resistivity trends were actually decrease with increasing additions of either CuO or ZnO. The variation in the electrical resistivity of these samples has been explained based on the changes of free electron concentration.
format	Thesis
qualification_level	Master's degree
author	Mas’ut, Aiza Masyati
author_facet	Mas’ut, Aiza Masyati
author_sort	Mas’ut, Aiza Masyati
title	Thermal, Electrical and Microstructural Characterization of Sno2-Based Ceramic Composites
title_short	Thermal, Electrical and Microstructural Characterization of Sno2-Based Ceramic Composites
title_full	Thermal, Electrical and Microstructural Characterization of Sno2-Based Ceramic Composites
title_fullStr	Thermal, Electrical and Microstructural Characterization of Sno2-Based Ceramic Composites
title_full_unstemmed	Thermal, Electrical and Microstructural Characterization of Sno2-Based Ceramic Composites
title_sort	thermal, electrical and microstructural characterization of sno2-based ceramic composites
granting_institution	Universiti Putra Malaysia
granting_department	Science
publishDate	2008
url	http://psasir.upm.edu.my/id/eprint/5173/1/FS_2008_48a.pdf
_version_	1747810367504908288

Thermal, Electrical and Microstructural Characterization of Sno2-Based Ceramic Composites

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