Crystal structure and temperature dependence of permittivity in barium aluminate based solid solutions

This study systematically investigated the structural, dielectric, and ferroelectric properties of BaAl(2−2x)(Mg0.5Ti0.5)2xO4 ceramics in the 0 ≤ x ≤ 0.04 range. Single‐phase solid solutions in the P63 space group with hexagonal crystal symmetry were confirmed in the composition range of 0 ≤ x ≤ 0.0...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 2019-12, Vol.102 (12), p.7480-7490
Main Authors: Li, Jie, Lan, Xue‐Kai, Du, Kang, Song, Xiao‐Qiang, Lu, Wen‐Zhong, Fan, Gui‐Fen, Lei, Wen
Format: Article
Language:English
Subjects:
Barium
Ceramics
Composition
Crystal structure
Dielectric properties
Ferroelectric materials
Ferroelectricity
Lattice vibration
Multilayers
Permittivity
Raman spectra
Raw materials
Solid solutions
Stability
Temperature dependence
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Summary:This study systematically investigated the structural, dielectric, and ferroelectric properties of BaAl(2−2x)(Mg0.5Ti0.5)2xO4 ceramics in the 0 ≤ x ≤ 0.04 range. Single‐phase solid solutions in the P63 space group with hexagonal crystal symmetry were confirmed in the composition range of 0 ≤ x ≤ 0.03. The bond lengths of Al1/(Mg,Ti)–O, Al2/(Mg,Ti)–O, and Al3/(Mg,Ti)–O increased with the increase in x, as confirmed through the Rietveld refinement and evolutions of corresponding modes in Raman spectra. The temperature stability of dielectric properties improved at a composition around x = 0.03, and the dielectric constant εr ascended with the increase in x. Ultrabroad temperature stability (−100°C to 700°C) was obtained, and an optimal combination (εr = 18.5, tan δ 
ISSN:0002-7820
1551-2916
DOI:10.1111/jace.16673