Abstract
A formula has been deduced, based on the simple binary ionic structure and fundamental concepts of lattice vibrations. It combines both the mass and interatomic distance effects. This model accounted well for the observed frequency shifts of the 52 and 84 cm -1 bands of KNO 3 II in the solid solutions of RbNO 3 in KNO 3 II (denoted as K 1- x Rb x NO 3 (KII)). For ionic crystals containing planar NO 3 - , our method appeared to work better than the lattice dynamic analysis based on the rigid ion model.
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