以不同固相合成工艺制备了Ag(Nb0.8Ta0.2)O3粉末, 并对其压片烧结后样品的XRD和SEM图进行了分析, 对成瓷性较好的样品的介电性能进行了测试. 结果表明: 不同工艺均可合成具有钙钛矿结构的Ag(Nb0.8Ta0.2)O3(ANT)样品, 但对样品成瓷性影响很大. 通过先将Nb2O5、Ta2O5在1200℃煅烧, 然后再同Ag2O反应生成Ag(Nb0.8Ta0.2)O3的合成工艺, ?在较低的烧结温度下, 就可烧制成粒径均匀、致密的陶瓷, 相比其他工艺合成?的样品, 其介电常数(ε)得到了提高, 介电损耗(tanδ)变小, 为最佳合成工艺.
Ag(Nb0.8Ta0.2)O3(ANT) powders were synthesized by using different solid-state reaction methods. The samples were characterized by XRD and SEM. In addition, the dielectric
properties of some good ceramic samples were tested. The results showed that different methods almost had no influence on the perovskite structure, but
affected the microstructure greatly. The ceramics obtained by the method, in which Nb2O5 and Ta2O5 were firstly sintered at 1200℃
and then reacted with Ag2O, showed a uniform particle distribution and higher density. Compared with the other methods, the dielectric properties
of the samples prepared by this method were improved, the dielectric constant (ε) was increased and the dissipation factor (tgδ) was decreased.
参考文献
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