Effects of Oxide Additives Coating on Microstructure and Dielectric Properties of BaTiO sub(3)

Effects of mixing methods (mechanical mixing, chemical coating) on microstructure and dielectric properties of Ho, Mg and Mn doped BaTiO sub(3) have been studied. BaTiO sub(3) particles coated with Ho, Mn and Mg were prepared by a homogeneous precipitation method using urea, and then silica was coat...

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Bibliographic Details
Published inJournal of electroceramics Vol. 17; no. 2-4; pp. 867 - 873
Main Authors Park, Jae Sung, Han, Young Ho
Format Journal Article
LanguageEnglish
Published 01.12.2006
Subjects
Barium titanates
Coating
Dielectric properties
Magnesium
Manganese
Microstructure
Pyrochlores
Surface chemistry
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Summary:Effects of mixing methods (mechanical mixing, chemical coating) on microstructure and dielectric properties of Ho, Mg and Mn doped BaTiO sub(3) have been studied. BaTiO sub(3) particles coated with Ho, Mn and Mg were prepared by a homogeneous precipitation method using urea, and then silica was coated by the sol-gel technique. The adsorption of additives on the BaTiO sub(3) surface was confirmed. Temperature characteristics of capacitance were satisfied by mechanical mixing and chemical coating techniques, both of which yield different sintering and microstructure behaviors. Pyrochlore phase (Ho sub(2)Ti sub(2)O sub(7)) was observed on the mechanically mixed sample, whereas none of pyrochlore phase was observed at the coated sample after thermal etching. Those different behaviors caused by the degree of homogeneous distribution of the additives in BaTiO sub(3) matrix were confirmed by EDS analysis.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
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ISSN:1385-3449
1573-8663
DOI:10.1007/s10832-006-5413-6