中国科学院深圳先进技术研究院机构知识库(SIAT OpenIR): Nano- and microsize effect of CCTO fillers on the dielectric behavior of CCTO/PVDF composites
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Nano- and microsize effect of CCTO fillers on the dielectric behavior of CCTO/PVDF composites
Wenhu Yang; Shuhui Yu; Rong Sun; Ruxu Du
2011
Source PublicationACTA MATERIALIA
Volume59Issue:14Pages:5593-5602
Subtype期刊论文
AbstractThe microstructure and dielectric properties of composites comprising polyvinylidene fluoride (PVDF) and calcium copper titanate (CCTO) particles have been investigated. Nano- and microsized CCTO were employed separately and investigated comparatively. The effective dielectric constant (epsilon(r)) of thecomposite containing 40 vol.% nanosized CCTO filler is over 10(6) at 10(2) Hz and room temperature, which is substantially higher than that of the composite containing microsized CCTO, of which the epsilon(r) value is 35.7 (with 40 vol.%). The epsilon(r) and loss tangent (tan delta) decrease with temperature for thecomposite containing nanosized CCTO, while the one with microsized CCTO shows the opposite tendency. For the composite with nanosized CCTO, theconductivity decreases sharply with increasing temperature in the low frequency range (100-10(4) Hz) and slightly increases in the high frequency range, whilethe conductivity of the composite with microsized CCTO is nearly independent of temperature. The theoretical calculations demonstrate that the activation energies of the composites containing nano- or microsized CCTO are -0.52 and 0.051 eV, indicating active interfaces and insulated grain boundaries in these two composites, respectively. Theoretical analysis also shows that the dielectric performance of the composite with nanosized CCTO does not follow theconventional mixing rules and the giant dielectric constant comes mainly from the interfacial polarization. The dielectric property of the composite containing microsized CCTO matches well with the Maxwell-Garnett and effective medium theory models, indicating insulate interfaces between the fillers and the matrix.The results obtained in this study indicate that the composite containing microsized CCTO may be suitable for embedded device applications, while the one with nanosized CCTO may find a new application in the temperature sensor field.
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Indexed BySCI
Language英语
Department先进材料研究中心
Document Type期刊论文
Identifierhttp://ir.siat.ac.cn/handle/172644/3226
Collection集成所
AffiliationACTA MATERIALIA
Recommended Citation
GB/T 7714
Wenhu Yang,Shuhui Yu,Rong Sun,et al. Nano- and microsize effect of CCTO fillers on the dielectric behavior of CCTO/PVDF composites[J]. ACTA MATERIALIA,2011,59(14):5593-5602.
APA Wenhu Yang,Shuhui Yu,Rong Sun,&Ruxu Du.(2011).Nano- and microsize effect of CCTO fillers on the dielectric behavior of CCTO/PVDF composites.ACTA MATERIALIA,59(14),5593-5602.
MLA Wenhu Yang,et al."Nano- and microsize effect of CCTO fillers on the dielectric behavior of CCTO/PVDF composites".ACTA MATERIALIA 59.14(2011):5593-5602.
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