Infrared reflection spectra of selected modifications of SiO2 and Al2O3

✍ Scribed by Dr. František Pechar

• Publisher: John Wiley and Sons
• Year: 1985
• Tongue: English
• Weight: 291 KB
• Volume: 20
• Category: Article
• ISSN: 0232-1300
• DOI: 10.1002/crat.2170200221

✦ Synopsis

Infrared Reflection Spectra of Selected Modifications of SiO, and A1,0, Infrared reflection spectra were measured within the wave number range of 1400 --400 c n -' for following SiO, anti A1,0, modifications: quartz, opal, quartz glass, cristobalite, tritlyiiiite, corundum, sapphire, ruby, gibbsite, boehmite, and diaspore. The spectral bands were attributed, according to literature quotations, to individual vibrations of bonds Si-0, 0-Si-0, Si-0-Si, A1-0, 0-A1-0, and AI-0-Al. The evaluation of infrared reflection spectra has shown that they are very sensitive to internal vibrations of Si-0, AI-0, which are affected by the syinriietry of the surrounding crystal field. They are therefore selective for individual ininerals and thus suitable for quick identifying purposes.

Es wurden die IR-Reflexionsspektren (1400 -200 cm-l) von Quarz, Opal, Quarzglass, Cristobalit, Tridymit, Korund, Sapphir, Rubin, Gibbsit, Bohmit und Diaspor gemessen. Die Spektrallmnden wurden den Schwingungen der einzelnen Bindungen (Si-0, 0-Si-0, Si-0-Si, A1-0, 0-A1-0 und A1-0-A1) des Minerals auf der Grundlage der Literaturdaten zugeordnet.