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首页> 外文期刊>Boletin de la Sociedad Espanola de Ceramica y Vidrio >Birnessites prepared by ion exchange. Structural evolution with temperature
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Birnessites prepared by ion exchange. Structural evolution with temperature

机译：通过离子交换制备的水钠锰矿。结构随温度的变化

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Birnessites containing Na~+ or K~+ in the interlayer have been prepared following a sol-gel method, with an initial glucose/cation ratio of 1 or 1.5. The solids have been submitted to ion exchange with Li~+, Mg~(2+), and Cu~(2+), and all the materials have been characterised-by several physicochemical techniques (elemental chemical analysis, X-ray diffraction, FT-IR spectroscopy, thermal analysis and specific surface area assessment). Total cation exchange was not achieved in any case, although sodium is better exchanged than potassium. Exchange is larger for Li~+, lower for Cu~(2+) and even lower for Mg~(2+). Ionic exchange is topotactic, and the layered structure is maintained in all cases, with an interlayer spacing close to 7 A. The samples are stable up to 600 deg C; above this temperature cryptomelane (a 2X2 tunnel structure) is formed in most of the samples containing potassium, while LiMn_2O_4 spinel is formed is Li was present in the birnessite.
机译：中间层中含有Na +或K +的水钠锰矿已经按照溶胶-凝胶法制备，初始葡萄糖/阳离子比为1或1.5。固体已与Li〜+，Mg〜（2+）和Cu〜（2+）进行离子交换，所有材料均已通过几种物理化学技术（元素化学​​分析，X射线衍射， FT-IR光谱，热分析和比表面积评估）。尽管钠比钾更好地交换，但在任何情况下都无法实现总阳离子交换。 Li〜+的交换较大，Cu〜（2+）的交换较低，而Mg〜（2+）的交换较低。离子交换是全能的，并且在所有情况下都保持了层状结构，层间间距接近7A。样品在600℃以下稳定。在此温度以上，大多数含钾样品中都形成了隐甲烷（2X2隧道结构），而锂在水钠锰矿中形成了LiMn_2O_4尖晶石。

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