Abstract
Novel glasses with high transmittance in 3–5 µm band and good mechanical/elastic properties are urgently needed in mid-infrared optical window. In this paper, the Gd2O3-regulated 31Ga2O3-(59-x)SrO-xGd2O3-10BaF2 (x = 4, 8, 12 and 16 mol%) gallate glasses with great potentiality in mid-infrared optical windows were synthesized and studied. With more introduction of Gd2O3, more non-bridging oxygen (NBO) was produced in glass network and longer infrared (IR) cut-off edges were obtained, which were demonstrated by Raman spectra and IR transmitting spectra respectively. With ultrasonic pulse-echo technique, the elastic properties of the glasses were obtained. The elastic modulus reached to a maximum with 8 mol% Gd2O3. By using a modified α with the value of 1.73, which is the slope of the linear-fitting of measured bulk modulus and the product of packing density and measured Young’s modulus, for the gallate glasses, Makishima-Mackenzie model and Rocherulle model were extended and a better agreement between experimental and calculated values of bulk modulus, shear modulus, longitudinal modulus and Poisson’s ratio has been achieved.
Published Version
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