Abstract
Abstract Refractive indices of molten LaCl3, PrCl3, NdCl3, DyCl3, and YCl3 were measured by the cylindrical lens method. The measurements were carried out with the lights of four wavelengths, and the refractive indices so obtained were represented by empirical equations as linear functions of temperature. From the data molar refractivities were calculated. The refractive indices at infinite wavelength were calculated by use of Cauchy’s relation for dispersion, and electronic polarizabilities were obtained for the salt molecules in molten state, and also the electronic polarizabilities of La3+, Pr3+, Dy3+, and Y3+ ions in the melts were obtained.
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