Percolative properties in ferroelectric-dielectric composite ceramics

Journal Article · Mon Nov 01 00:00:00 EDT 2010 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.3514246· OSTI ID:21464544

Qiwei, Zhang; Jiwei, Zhai; Xi, Yao ^[1]; Lingbing, Kong ^[2]

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1. Functional Materials Research Laboratory, Tongji University, Siping Road 1239, Shanghai 200092 (China)
2. Temasek Laboratories, National University of Singapore, 5A Engineering Drive 1, Singapore 117411 (Singapore)

Percolative properties in dielectric (DE) tunability were observed in three ferroelectric (FE)-DE composite ceramics as follows: xBa{sub 0.5}Sr{sub 0.5}TiO{sub 3}-MgO, xBa{sub 0.4}Sr{sub 0.6}TiO{sub 3}-Mg{sub 2}TiO{sub 4}, and xBa{sub 0.5}Sr{sub 0.5}TiO{sub 3}-Mg{sub 3}B{sub 2}O{sub 6}. Dielectric constants of the composites increased monotonously with increasing volume fractions of FE component. Comparatively, their DE tunabilities exhibited a weak dependence on FE concentrations over a wide range. However, their tunabilities started to decrease substantially below a critical concentration of FE. The critical concentrations were 40 vol % for Ba{sub 0.5}Sr{sub 0.5}TiO{sub 3}-MgO, 38 vol % for Ba{sub 0.4}Sr{sub 0.6}TiO{sub 3}-Mg{sub 2}TiO{sub 4}, and 33 vol % for Ba{sub 0.5}Sr{sub 0.5}TiO{sub 3}-Mg{sub 3}B{sub 2}O{sub 6}. These results could be used as a guide to tailor the properties of FE-DE composites for tunable device applications.

• OSTI ID: 21464544
• Journal Information: Applied Physics Letters, Vol. 97, Issue 18; Other Information: DOI: 10.1063/1.3514246; (c) 2010 American Institute of Physics; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM COMPOUNDS
CERAMICS
COMPOSITE MATERIALS
CONCENTRATION RATIO
FERROELECTRIC MATERIALS
MAGNESIUM OXIDES
PERMITTIVITY
RESONANCE
STRONTIUM TITANATES
ALKALINE EARTH METAL COMPOUNDS
CHALCOGENIDES
DIELECTRIC MATERIALS
DIELECTRIC PROPERTIES
DIMENSIONLESS NUMBERS
ELECTRICAL PROPERTIES
MAGNESIUM COMPOUNDS
MATERIALS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
STRONTIUM COMPOUNDS
TITANATES
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS