Pure Na-4-mica: Synthesis and characterization
Pure Na-4-mica: Synthesis and characterization
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DOI：
10.1021/cm0116267
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发表时间：
2002-06-01
影响因子：
8.6
通讯作者：
Choi, J
中科院分区：
文献类型：
--
作者：
Park, M;Lee, DH;Choi, J
本研究开发了一种创新的相纯 Na-4-云母合成方法。采用氯化钠熔体合成了相纯的Na-4-云母。在新开发的方法中，不仅可以避免后制备过程，而且可以通过Al2O3/NaCl的初始摩尔比将晶体尺寸控制在约2-5μm的范围内。水合Na-4-云母相和无水Na-4-云母相均具有相同层平面的单斜晶系。 X射线衍射(XRD)图显示出相对强的h 01 峰以及非常强的001 峰。水合脱水过程中细胞参数 和 c 的变化表明，层膨胀伴随着显着的层平行位移。此外，纯Na-4-云母在高达800℃的温度下表现出完全可逆的脱水-再水合行为和极高的Sr2+吸收能力，而没有任何层塌陷。
An innovative synthesis method for phase-pure Na-4-mica has been developed in this study. Phase pure Na-4-mica has been synthesized by using NaCl melt. In the newly developed method, not only could the postpreparation process be avoided but also the crystal size could be manipulated in the range of about 2-5 mum by the initial molar ratio of Al2O3/NaCl. Both the hydrated and anhydrous Na-4-mica phases possess monoclinic crystal systems with the same layer plane. The X-ray diffraction (XRD) patterns exhibited relatively strong h 01 peaks along with very strong 001 peaks. Changes in the cell parameters of and c on hydration-dehydration indicate that the layer swelling is accompanied with a significant parallel displacement of layers. Furthermore, pure Na-4-mica has exhibited completely reversible dehydration-rehydration behavior up to 800 degreesC and extremely high Sr2+ uptake capacity without any layer collapse.