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Pressure Dependence of the Infrared-Active Phonons in the Mixed Crystal System KCl1−xBrx

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Abstract

The mixed crystal system KCl1−xBrx shows a one-mode type behavior. The variation of the long-wavelength transverse optical (TO) mode frequency at 1 atm pressure can be understood in terms of the virtual crystal model. The variation of the frequency with pressure or the mole fraction x can be expressed in terms of volume change alone. The slopes of the νTO mode vs P are highest for the end numbers, and are less for intermediate values of x, and may be understood in terms of a nonlinear variation of the compressibility with x.

© 1970 Optical Society of America

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