The effect of grain and particle size on the microwave properties of barium titanate (BaTiO3)

Autor:	Mark P. McNeal, Robert E. Newnham, Sei-Joo Jang
Rok vydání:	1998
Předmět:	Permittivity Materials science Condensed matter physics Ferroelectric ceramics General Physics and Astronomy Dielectric Ferroelectricity Grain size chemistry.chemical_compound chemistry visual_art Barium titanate visual_art.visual_art_medium Dielectric loss Ceramic
Zdroj:	Journal of Applied Physics. 83:3288-3297
ISSN:	1089-7550 0021-8979
DOI:	10.1063/1.367097
Popis:	The use of ferroelectric ceramics and thin films in microwave devices requires that they possess frequency-stable, low-loss dielectric properties. At microwave frequencies, ferroelectric polycrystalline ceramic materials typically exhibit a large dielectric relaxation, characterized by a decrease in the relative permittivity (er) and a peak in the dielectric loss (tan δ). Mechanisms attributed to the relaxation phenomenon include piezoelectric resonance of grains and domains, inertia to domain wall movement, and the emission of gigahertz shear waves from ferroelastic domain walls. As a result, the relaxation phenomenon appears to be intimately linked to the domain state of the ferroelectric. The domain state of a ferroelectric is, in part, dependent upon its microstructure. In this study, the microwave dielectric properties of ferroelectric barium titanate were measured as a function of grain and particle size. Polycrystalline ceramic ferroelectric BaTiO3 (having average grain sizes of 14.4, 2.14, and 0.2...
Databáze:	OpenAIRE
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