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Cubic and hexagonal sodium yttrium fluoride were successfully synthesized from yttrium nitrate, sodium fluoride and poly-ethanediol in propanetriol solvent under a facile hydrothermal route. By regulating the molar ratio of yttrium and fluoride, hydrothermal tem-perature and reaction time, the phase and shape of sodium yttrium fluoride were commendably controlled. The as-prepared products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray spectrum (EDS) techniques. It was revealed that the hollow-structured Na(Y1.5Na0.5)F6 nanotubes self-assembled and arrayed orientedly to be bamboo raft-shaped. The for-mation of hexagonal Na(Y1.5Na0.5)F6 nanotube arrays was attributed to solid-liquid-solid process and Oswald ripening. This study provided a simple method to prepare hexagonal bamboo raft-shaped Na(Y1.5Na0.5)F6 on a large scale, which broadened their practical applications. 相似文献
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通过试验研制出了ZrO2-CeO2-SrO固体电解质超细粉。研究表明,其颗粒粒径随母液的浓度的增大、氨水的加入量的减少、烧结温度的提高及烧结时间的延长而增大,粒径分布的范围也增大,适宜条件分别为0.1mol/L,pH为14,700℃,4h。通过SEM观察,颗粒呈无规则形状,通过XRD分析了氧化物之间的结合情况,发现有固溶体产生。图3,表4,参5。 相似文献
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氟石膏综合利用的新途径 总被引:1,自引:0,他引:1
在铝的冶炼过程中,有大量的氟石膏排出。以氟石膏脱水产生的熟石膏为主要原料制氟石加气砌块,为该废渣的利用开辟了一条有效的途径。本文讨论了温度对试样性能的影响,确定了最佳的温度范围。在分析了石灰、熟石膏和复合缓凝剂等主要原料的作用机理的基础上,讨论了它们对加气砌块的性能的影响,并通过试验确定了熟料的最佳引入量为65 ̄70%,饱和石灰掺量为12%,复合缓凝剂用量为不超过4.5%。 相似文献
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