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http://dx.doi.org/10.4191/kcers.2016.53.2.178

Improved Temperature Stability in Dielectric Properties of 0.8BaTiO3-(0.2-x)NaNbO3-xBi(Mg1/2Ti1/2)O3 Relaxors  

Goh, Yumin (Department of Materials Engineering, Korea Aerospace University)
Kim, Baek-Hyun (Materials Research Institute, Korea Aerospace University)
Bae, Hyunjeong (Materials Research Institute, Korea Aerospace University)
Kwon, Do-Kyun (Department of Materials Engineering, Korea Aerospace University)
Publication Information
Journal of the Korean Ceramic Society / v.53, no.2, 2016 , pp. 178-183 More about this Journal
Abstract
Ferroelectric relaxor ceramics with $BaTiO_3-NaNbO_3-Bi(Mg_{1/2}Ti_{1/2})O_3$ ternary compositions (BT-NN-BMT) have been prepared by sol-gel powder synthesis and consequent bulk ceramic processing. Through the modified chemical approach, fine and single-phase complex perovskite compositions were successfully obtained. Temperature and frequency dependent dielectric properties indicated typical relaxor characteristics of the BT-NN-BMT compositions. The ferroelectric-paraelectric phase transition became diffusive when NN and BMT were added to form BT based solid solutions. BMT additions to the BT-NN solid solutions affected the high temperature dielectric properties, which might be attributable to the compositional inhomogeneity of the complex perovskite and resulting weak dielectric coupling of the Bi-containing polar nanoregions (PNRs). The temperature stability of the dielectric properties was good enough to satisfy the X9R specification. The quasi-linear P-E response and the temperature- stable dielectric properties imply the high potential of this ceramic compound for use in high temperature capacitors.
Keywords
Relaxor; High temperature capacitor; BT-NN-BMT; Perovskite; X9R;
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