Sintering Behavior and Dielectric Properties of xBaTiO3-(1-x)Pb(Fe2/3W1/3)O3 Ceramics

碩士 === 義守大學 === 材料科學與工程學系 === 88 === Abstract In order to decrease the firing temperature of Barium Titanate (BaTiO3, BT), low-melting(930℃) point Lead Iron Tungstate (Pb(Fe2/3W1/3)O3, PFW) relaxor has used as sintering aid. Lead Iron Tungstate has high dielectric constant and diffuse pha...

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Main Authors: Chin-Hsin Tsai, 蔡志欽
Other Authors: Chi-Shiung Hsi
Format: Others
Language:en_US
Published: 2000
Online Access:http://ndltd.ncl.edu.tw/handle/36893017169226824816
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spelling ndltd-TW-088ISU001590092015-10-13T10:56:26Z http://ndltd.ncl.edu.tw/handle/36893017169226824816 Sintering Behavior and Dielectric Properties of xBaTiO3-(1-x)Pb(Fe2/3W1/3)O3 Ceramics xBaTiO3-(1-x)Pb(Fe2/3W1/3)O3燒結行為與介電性質之研究 Chin-Hsin Tsai 蔡志欽 碩士 義守大學 材料科學與工程學系 88 Abstract In order to decrease the firing temperature of Barium Titanate (BaTiO3, BT), low-melting(930℃) point Lead Iron Tungstate (Pb(Fe2/3W1/3)O3, PFW) relaxor has used as sintering aid. Lead Iron Tungstate has high dielectric constant and diffuse phase transform characteristics. Binary system in composition of xBT-(1-x)PFW (x =wt﹪) was prepared by mixed-oxides or BT-PFW mixed phases methods. BaWO4 and BaFe12O19 phases were observed in the samples prepared by mixed-oxides or mix-phases processes when the samples were heat-treated at 500℃ for 2hours. Electrical and physical properties of BT-PFW ceramics were affected by the formation of BaWO4 and BaFe12O19 phases. Dielectric constants of BT-PFWs were in the range of 500s, since the dielectric constant of BaWO4 was as low as 8. Two shrinkage stages were observed from the xBT-(1-x)PFW samples with x=0.2、0.5. The first shrinkage stage was considered as low-firing temperature PFW and BaWO4 phases reacting at 750℃-850℃. The second shrinkage was due to the formation of non-stoichimetric PFW liquid at 1050℃. BT particles were wetted by PFW liquid. Due to particle rearrangement, the BT-PFW samples shrunk at this temperature. Dielectric properties of xBT-(1-x)PFW are dependent on grain size and amount of second phases BaWO4 and BaFe12O19 formed. Dielectric constant increased by the conditions of exact PFW(x=0.5) content, rapid heating rate(15℃/min), short dwelling time(30min), it reduced the contact area between BT and PFW grain and decreased the amount of second phases. Samples prepared by those conditions and sintered at 930℃, had dielectric constant of 1670. Influences from second phases and pores were not completely excluded in this research. Chi-Shiung Hsi Wen-Kuan Lin 許志雄 林文寬 2000 學位論文 ; thesis 75 en_US
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language en_US
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description 碩士 === 義守大學 === 材料科學與工程學系 === 88 === Abstract In order to decrease the firing temperature of Barium Titanate (BaTiO3, BT), low-melting(930℃) point Lead Iron Tungstate (Pb(Fe2/3W1/3)O3, PFW) relaxor has used as sintering aid. Lead Iron Tungstate has high dielectric constant and diffuse phase transform characteristics. Binary system in composition of xBT-(1-x)PFW (x =wt﹪) was prepared by mixed-oxides or BT-PFW mixed phases methods. BaWO4 and BaFe12O19 phases were observed in the samples prepared by mixed-oxides or mix-phases processes when the samples were heat-treated at 500℃ for 2hours. Electrical and physical properties of BT-PFW ceramics were affected by the formation of BaWO4 and BaFe12O19 phases. Dielectric constants of BT-PFWs were in the range of 500s, since the dielectric constant of BaWO4 was as low as 8. Two shrinkage stages were observed from the xBT-(1-x)PFW samples with x=0.2、0.5. The first shrinkage stage was considered as low-firing temperature PFW and BaWO4 phases reacting at 750℃-850℃. The second shrinkage was due to the formation of non-stoichimetric PFW liquid at 1050℃. BT particles were wetted by PFW liquid. Due to particle rearrangement, the BT-PFW samples shrunk at this temperature. Dielectric properties of xBT-(1-x)PFW are dependent on grain size and amount of second phases BaWO4 and BaFe12O19 formed. Dielectric constant increased by the conditions of exact PFW(x=0.5) content, rapid heating rate(15℃/min), short dwelling time(30min), it reduced the contact area between BT and PFW grain and decreased the amount of second phases. Samples prepared by those conditions and sintered at 930℃, had dielectric constant of 1670. Influences from second phases and pores were not completely excluded in this research.
author2 Chi-Shiung Hsi
author_facet Chi-Shiung Hsi
Chin-Hsin Tsai
蔡志欽
author Chin-Hsin Tsai
蔡志欽
spellingShingle Chin-Hsin Tsai
蔡志欽
Sintering Behavior and Dielectric Properties of xBaTiO3-(1-x)Pb(Fe2/3W1/3)O3 Ceramics
author_sort Chin-Hsin Tsai
title Sintering Behavior and Dielectric Properties of xBaTiO3-(1-x)Pb(Fe2/3W1/3)O3 Ceramics
title_short Sintering Behavior and Dielectric Properties of xBaTiO3-(1-x)Pb(Fe2/3W1/3)O3 Ceramics
title_full Sintering Behavior and Dielectric Properties of xBaTiO3-(1-x)Pb(Fe2/3W1/3)O3 Ceramics
title_fullStr Sintering Behavior and Dielectric Properties of xBaTiO3-(1-x)Pb(Fe2/3W1/3)O3 Ceramics
title_full_unstemmed Sintering Behavior and Dielectric Properties of xBaTiO3-(1-x)Pb(Fe2/3W1/3)O3 Ceramics
title_sort sintering behavior and dielectric properties of xbatio3-(1-x)pb(fe2/3w1/3)o3 ceramics
publishDate 2000
url http://ndltd.ncl.edu.tw/handle/36893017169226824816
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