Effect of sintering temperature on the percolation threshold and the dielectric properties Ca[(Li1/3Nb2/3)1–x Tix]O3–δ – Ag composite
Effect of sintering temperature on the percolation threshold and the dielectric properties Ca[(Li1/3Nb2/3)1–x Tix]O3–δ – Ag composite
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DOI：
10.1016/j.compscitech.2008.04.022
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发表时间：
2008-09
影响因子：
9.1
通讯作者：
S. George;M. Sebastian
中科院分区：
文献类型：
--
作者：
S. George;M. Sebastian
The Ca[(Li1/3Nb2/3)1–xTix]O3–δ+Ag (CLNT+Ag) composites were prepared by solid state ceramic route and its dielectric properties were investigated as a function of silver loading. The sintering temperature of the CLNT ceramics was lowered to 950°C/2h by the use of (Li2CO3–B2O3–SiO2) LBS glass additive. The effect of sintering temperature on the percolation threshold of ceramic–silver composites was investigated. The dielectric properties were systematically characterized in terms of relative permittivity, dielectric loss and conductivity with volume fraction of silver, frequency and temperature. The relative permittivity of the composite increases with silver content and it is in good agreement with power law below the percolation limit. Addition of 0.17volume fraction of silver increases the relative permittivity of CLNT+5wt% LBS from 32 to 270 at 1MHz. The maximum increase in relative permittivity (εr≈4×105) with low dielectric loss (tanδ≈10–2) at 1MHz was observed for 0.18volume fraction of silver. The relative permittivity of the composites was found to be independent of temperature for all the range of silver loading investigated in this study. CLNT+5wt% LBS with 0.18volume fraction of Ag shows the capacitance density of 0.265μF/cm2and 21.5μF/cm2at 1MHz and 100KHz, respectively. This offers the perspectives for application of this composite in decoupling and electromechanical devices.
