A- and B-site modified perovskite nanosheets and their integrations into high-κ dielectric thin films

Minoru Osada; Takayoshi Sasaki

doi:10.1111/j.1744-7402.2011.00713.x

A- and B-site modified perovskite nanosheets and their integrations into high-κ dielectric thin films

Minoru Osada, Takayoshi Sasaki

Research output: Contribution to journal › Article › peer-review

23 Citations (Scopus)

Abstract

We investigated dielectric properties of perovskite nanosheets with different compositions (Ca _2-xSr _xNb _3-yTa _yO ₁₀) to study the influence of A- and B-site modifications on dielectric properties. Langmuir-Blodgett deposition was employed to fabricate multilayer nanofilms of perovskite nanosheets. In these nanosheets, the A-site modification by Sr ²⁺ ions causes the increase in ε _r value, whereas the B-site modification with Ta ⁵⁺ ions improves leakage current characteristics and reduces permittivity value. The optimized property (ε _r = 240) is obtained for Sr ₂Nb ₃O ₁₀ nanosheet. We also discuss high-κ properties of Ca _2-xSr _xNb _3-yTa _yO ₁₀ nanosheets by detailed investigations on first-principles calculations and interfacial structures.

Original language	English
Pages (from-to)	29-36
Number of pages	8
Journal	International Journal of Applied Ceramic Technology
Volume	9
Issue number	1
DOIs	https://doi.org/10.1111/j.1744-7402.2011.00713.x
Publication status	Published - 2012 Jan
Externally published	Yes

ASJC Scopus subject areas

Ceramics and Composites
Marketing
Materials Chemistry
Condensed Matter Physics

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abstract = "We investigated dielectric properties of perovskite nanosheets with different compositions (Ca 2-xSr xNb 3-yTa yO 10) to study the influence of A- and B-site modifications on dielectric properties. Langmuir-Blodgett deposition was employed to fabricate multilayer nanofilms of perovskite nanosheets. In these nanosheets, the A-site modification by Sr 2+ ions causes the increase in ε r value, whereas the B-site modification with Ta 5+ ions improves leakage current characteristics and reduces permittivity value. The optimized property (ε r = 240) is obtained for Sr 2Nb 3O 10 nanosheet. We also discuss high-κ properties of Ca 2-xSr xNb 3-yTa yO 10 nanosheets by detailed investigations on first-principles calculations and interfacial structures.",

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