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The elastic moduli of the entire vitreous range of the system ZnO–P2O5 that can be prepared by melting ZnO and P2O5 oxides in open crucibles have been measured by ultrasonic techniques. The bulk, shear, longitudinal, and Young’s moduli, and the Poisson’s ratio are found to be rather sensitive to the glass composition. From these ultrasonic data, it is found that the glass system can be divided into ‘‘three compositional regions.’’ This behavior is qualitatively interpreted in terms of the zinc coordination, cross-link densities, and interatomic force constants.

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