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首页> 外文期刊>Vibrational Spectroscopy: An International Journal devoted to Applications of Infrared and Raman Spectroscopy >Revisiting the cation mass-valence sum approach to assigning infrared OH-bands in dioctahedral smectites in the light of new data from synthetic Ga-Fe3+ smectites
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Revisiting the cation mass-valence sum approach to assigning infrared OH-bands in dioctahedral smectites in the light of new data from synthetic Ga-Fe3+ smectites

机译：根据合成GA-Fe3 +麦片粘土的新数据，重新探测阳离子质量化方法在Dioctahedral蒙脱石中分配红外OH-带

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摘要

A series of pure Ga-Fe3+ smectites were synthesized at 180 degrees C in order to complete IR data in the Al-Ga-Fe3+ system. MIR and NIR data from natural and synthetic smectites in the Al-Fe3+, Al-Ga and Fe3+-Ga chemical series exemplified a case where some nu OH, delta OH and (nu + delta) OH band positions did not follow the relation: nu OH (cm(-1))=(1/2 pi c)*(k(OH)/mu(OH))(1/2). This relation is often used to approximate the position of the OH vibration bands from the reduced masses of octahedral cations linked to hydroxyls in clay minerals. In this study, better relations were established between the wavenumbers of the OH absorption band of smectites and the average ionic radius of neighboring octahedral cations. Similar trends were established previously for M-(OH)(2) hydroxides (G.W. Brindley, C. Kao, Phys. Chem.Miner. 10 (1984) 187-191) suggesting a possible generalization of a link between OH frequencies in IR spectra and the average ionic radii of neighboring octahedral cations for hydroxylated minerals. (C) 2016 Elsevier B.V. All rights reserved.
机译：在180℃下合成一系列纯GA-Fe3 +蒙脱石，以完成Al-Ga-Fe3 +系统中的IR数据。来自Al-Fe3 +，Al-Ga和Fe3 + -GA化学系中的自然和合成麦片的MIR和NIR数据示例了一些NU OH，DELTA OH和（NU + DELTA）OH频段位置没有遵循关系：NU OH（cm（-1））=（1/2 pi c）*（k（OH）/ mu（OH））（1/2）。该关系通常用于近似OH振动带免于与粘土矿物中的羟基阳离子的减少的八面体阳离子的位置。在这项研究中，在蒙脱石的OH吸收带的波兰观察者和相邻八面体阳离子的平均离子半径之间建立了更好的关系。以前用于M-（OH）（2）氢氧化物（GW Brindley，C.Kao，Phys。化学）建立了类似的趋势。图10（1984）187-191）表明IR光谱中OH频率之间的链路可能的概括和羟基化矿物的相邻八面体阳离子的平均离子半径。 （c）2016年Elsevier B.v.保留所有权利。

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