Abstract

Anisometric Na₂Nb₈O₂₁ particles were synthesized by a molten salt synthesis (MSS). The effects of salt content on the crystal structure and morphologies of the product powder were analyzed. The results show that the addition of excess NaCl effectively promoted the growth of product particles. The Na₂Nb₈O₂₁ ceramics were prepared using the obtained particles as raw materials. It was found that all ceramic specimens exhibit relatively high transparency. The ceramics possessed optimum dielectric properties with well thermal stability of dielectric constant (Δε/ε_Tm ≤ ± 15%) over a broad temperature range from 85 °C to 260 °C at S/O = 6.

摘要

通过熔融盐合成（MSS）合成等距的Na ₂ Nb ₈ O ₂₁颗粒。分析了含盐量对产品粉末晶体结构和形貌的影响。结果表明，过量的NaCl的添加有效地促进了产物颗粒的生长。使用获得的颗粒作为原料，制备Na ₂ Nb ₈ O ₂₁陶瓷。发现所有陶瓷样品都显示出较高的透明度。陶瓷具有最佳的介电特性与介电常数的良好的热稳定性（Δε/ε_的Tm为85℃〜260℃，S / O = 6≤±15％）在宽的温度范围内。