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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 diff...

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Main Author: Mas’ut, Aiza Masyati
Format: Thesis
Language:English
Published: 2008
Online Access:http://ethesis.upm.edu.my/id/eprint/732/1/FS_2008_48f.pdf
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spelling oai:ethesis.upm.edu.my:732 http://ethesis.upm.edu.my/id/eprint/732/ Thermal, Electrical and Microstructural Characterization of SnO2-Based Ceramic Composites 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. 2008 Thesis NonPeerReviewed application/pdf en http://ethesis.upm.edu.my/id/eprint/732/1/FS_2008_48f.pdf Mas’ut, Aiza Masyati (2008) Thermal, Electrical and Microstructural Characterization of SnO2-Based Ceramic Composites. Masters thesis, Universiti Putra Malaysia. (FS 2008 48).
institution UPM eTHESES
collection UPM eTHESES
language English
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
author Mas’ut, Aiza Masyati
spellingShingle Mas’ut, Aiza Masyati
Thermal, Electrical and Microstructural Characterization of SnO2-Based Ceramic Composites
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
publishDate 2008
url http://ethesis.upm.edu.my/id/eprint/732/1/FS_2008_48f.pdf
_version_ 1819310058673012736
score 13.4562235

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