Infrared examination of solid materials that are unstable to atmospheric moisture or oxygen can be accomplished by the pressed-pellet technique only if precautions are taken to exclude these gases during sample preparation and scanning of the spectrum. A simple technique utilizing a dry box and an easily constructed sandwich-type cell has been developed in this laboratory and successfully used for obtaining the infrared spectra of many highly sensitive materials.
W. H. Price and R. H. Maurer, "Preparation of Potassium Bromide Pellets of Unstable Materials," Appl. Spectrosc. 17, 106-107 (1963)