Densities and Refractive Indices of Molten Alkali Iodides: Estimation of Electronic Polarizability of an Iodide Ion

Abstract

Densities and refractive indices of molten alkali iodides, MI (M = Li, Na, K, Rb, and Cs), were measured precisely by dilatometry and goniometry with visible lights, respectively. The densities of the molten iodides varied with the rise of temperature, from which the molar volumes were approximated into linear functions of temperature. The refractive indices were expressed as functions of both temperature and wavelength of the lights used, often called dispersion formulae, according to nonlinear least-squares regression. The electronic polarizabilities of discrete ions in the melts were estimated from the densities and the refractive indices extrapolated to infinite wavelength using the Lorentz−Lorenz equation.

Characterization of FeS2 pyrite microcrystals synthesized in different flux media

“…The melting temperatures of KI, LiI, CsI, and Na 2 S x are 681 1C, 469 1C, 621 1C, and 400 1C, respectively. 32,33 Thus, the synthesis temperatures were set as 690 1C for the iodide salts and 475 1C for Na 2 S x flux (see Table 1, Results and discussion). All the ampoules were heated for 10 days.…”