基于K/sub 2/Sr/sub 4/Nb/sub 10/O/sub 30/和BaTiO/sub 3/的陶瓷的显微结构和介电性能

Proceedings of the 13th IEEE International Symposium on Applications of Ferroelectrics, 2002. ISAF 2002. Pub Date : 2002-05-28 DOI:10.1109/ISAF.2002.1195917

R. Chen, Xiao-hui Wang, Longtu Li, Z. Gui

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引用次数: 0

摘要

寻找具有高介电常数和/spl epsiv/曲线平坦的介电材料仍在进行中。K/sub 2/Sr/sub 4/Nb/sub 10/O/sub 30/基介电陶瓷，具有四方钨青铜结构(TTB)，具有高介电常数和符合X7R规格的平坦/spl介电常数曲线。BaTiO/ sub3 /基铁电陶瓷是陶瓷电容器的经典介电材料。将结构相近的四方钨青铜(TTB)铌酸盐K/sub 2/Sr/sub 4/Nb/sub 10/O/sub 30/ (KSN)与钙钛矿BaTiO/sub 3/ (BT)混合，得到了上述结果。用XRD分析了相组成，用SEM研究了微观结构。本文研究了在x = 0.1 ~ 0.9时(x表示KSN的质量比)组成(K/sub 2/Sr/sub 4/Nb/sub 10/O/sub 30/)/sub x//spl middot/(BaTiO/sub 3/)/sub 1-x/的介电曲线/spl epsiv/。室温下介电常数在x = 0.4处最低。当x在0.4 ~ 0.7之间时，陶瓷复合材料的/spl epsiv/曲线随温度的升高呈线性下降。烧结后存在两种不同的相，TTB型和钙钛矿型。

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Microstructural and dielectric properties of ceramics based on K/sub 2/Sr/sub 4/Nb/sub 10/O/sub 30/ and BaTiO/sub 3/

The search for dielectric materials with a high dielectric constant and /spl epsiv/ curves with a flat profile is still ongoing. K/sub 2/Sr/sub 4/Nb/sub 10/O/sub 30/-based dielectric ceramics, having the tetragonal tungsten bronze structure (TTB), which display a high permittivity and flat /spl epsiv/ curves meeting the X7R specification. BaTiO/sub 3/-based ferroelectric ceramics are classic dielectric materials for ceramic capacitors. Results were obtained by mixing compounds with closely related structures, such as the tetragonal tungsten bronze (TTB) niobate K/sub 2/Sr/sub 4/Nb/sub 10/O/sub 30/ (KSN) and the perovskite BaTiO/sub 3/ (BT). Phase compositions were analyzed by using XRD and the microstructure was investigated by SEM. The present study explores the dielectric curves /spl epsiv/ of the composition (K/sub 2/Sr/sub 4/Nb/sub 10/O/sub 30/)/sub x//spl middot/(BaTiO/sub 3/)/sub 1-x/ with x = 0.1-0.9 where x means the weight ratio of KSN. The dielectric constant at room temperature is lowest at x = 0.4. When x is between 0.4 and 0.7, /spl epsiv/ curves of the ceramic composites present a linear decrease with the temperature. Two different phases, TTB and perovskite type, are present after sintering.

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Proceedings of the 13th IEEE International Symposium on Applications of Ferroelectrics, 2002. ISAF 2002.

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