Infrared Spectroscopy of the Solid Solution [KxNa1-x]2CO3

A complete infrared study of the mixed crystal systems K 2 CO 3 and Na 2 CO 3 has been carried out in the region of 4000–600 cm -1 . The study includes the internal fundamental normal vibrations of the CO 3 ion in the ordered phases of the two carbonates at room temperature for different values of potassium concentration. The IR spectra, spectral band shape intensities and frequencies of the internal modes have been studied as a function of the potassium ion concentration.