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The structural changes of synthetic and natural beidellites during dehydroxylation have been studied using infrared emission spectroscopy of the OH-stretching and bending regions. The OH-stretching region is characterized by two OH-stretching modes around 3600–3615 cm−1and around 3650 cm−1. These bands strongly decrease in intensity upon dehydroxylation up to 600°C for the natural beidellite and 700–750°C...
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