| CaTiO3纳米粉体溶胶-凝胶法合成、表征及介电特性 |
| Sol-gel Method Synthesis, Characterization and Dielectric Properties of CaTiO3 Nano-powders |
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| 摘要: 采用无机盐溶胶-凝胶法制备了CaTiO3纳米粉体，采用TG-DTA、XRD、TEM等技术进行了表征，并探讨了CaTiO3纳米粉体烧结特性及介电效应。结果表明，干凝胶800 ℃低温煅烧可获得粒径分布较窄、平均粒径为60～70 nm的单相CaTiO3纳米粉。纳米CaTiO3粉具有较大的比表面积，使作为粉体烧结驱动力的表面能剧增，促使CaTiO3在1 200 ℃实现致密烧结，比固相法制备的微米粉烧结降低100～200 ℃，且具有较宽的烧结温区。与微米级粉体烧结体介电特性相比，纳米粉具有更高的Qf值。纳米CaTiO3粉制备的陶瓷在1 250 ℃烧结2 h，获得优良的介电性能：εr=172，Qf=4 239 GHz，τf=+7.68 × 10-4 ℃-1。 |
| 关键词: 纳米CaTiO3 溶胶-凝胶 介电性能 |
| 基金项目: |
| Abstract: CaTiO3 nanoparticles were prepared by inorganic salt sol-gel method and characterized by XRD, TG-DTA and TEM techniques. CaTiO3 nanoparticles with a diameter of 60～70 nm and narrow particle size distribution were obtained by calcining the CaO-TiO2 xerogel at 800 ℃. Due to much lager specific area and higher surface activity of CaTiO3 nano-powder, the CaTiO3 ceramics made from the nano-powder can be sintered at 1 200 ℃ to acquire the dense structure. The sintering temperature was 100～200 ℃ lower than the sample obtained by solid-reaction method using micron powder. At the same time, the sintering range of CaTiO3 ceramics was also widened. The samples prepared from nano-powder had higher quality factor (Qf) values compared to those prepared from micron powder. At the sintering temperature of 1 250 ℃, the CaTiO3 ceramics made from nano-powder had good dielectric properties: εr=172, Qf=4 239 GHz (f=2 GHz), τf=+7.68 × 10-4 ℃-1. |
| Keywords: nanosized CaTiO3 sol-gel dielectric properties |
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| 张启龙,王焕平,杨辉.CaTiO3纳米粉体溶胶-凝胶法合成、表征及介电特性[J].无机化学学报,2006,22(9):1657-1662. |
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