Enhanced Dielectric Properties of Ba 0.5 Sr 0.5 TiO 3 /MgO Composites Prepared by Coprecipitation Derived Core–Shell Powders | Zendy

Zhang Jingji | Zendy; Ji Ludong | Zendy; Xu Yu | Zendy; Gao Yafeng | Zendy; Pan Yani | Zendy; Wang Jiangying | Zendy

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Enhanced Dielectric Properties of Ba 0.5 Sr 0.5 TiO 3 /MgO Composites Prepared by Coprecipitation Derived Core–Shell Powders

Author(s) -

Zhang Jingji,

Ji Ludong,

Xu Yu,

Gao Yafeng,

Pan Yani,

Wang Jiangying

Publication year - 2015

Publication title -

journal of the american ceramic society

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.9

H-Index - 196

eISSN - 1551-2916

pISSN - 0002-7820

DOI - 10.1111/jace.13957

Subject(s) - materials science , coprecipitation , composite number , dielectric , composite material , nanocomposite , ceramic , oleic acid , chemical engineering , precipitation , nanoparticle , nanotechnology , chemistry , biochemistry , optoelectronics , engineering , physics , meteorology

Ba 0.5 Sr 0.5 TiO 3 /MgO ( BST /MgO) composite ceramics have been prepared in situ by using an oxalate precipitation process. SEM and TEM images show that oleic acid modified BST /MgO nanocomposite exhibits helminth‐like particles consisting of BST core and MgO shell. Results reveal that oleic acid modification is chemisorbed on MgO particles as a carboxylate to form MgO shell, which connects to interparticles. Accordingly, the BST particles are well surrounded naturally by a thin MgO layer in the composite ceramics. As a result, the oleic acid modified BST /MgO composite ceramics shows better dielectric properties, with permittivity of 203, loss tangent of 0.0025 (at 2.4 GHz), and tunability of 10.2%.

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