Abstract
Glass samples with composition xSrO-10PbO-(90-x)B2O3 (x=20, 25, 30, 35, 40 and 45) were prepared by melt-quenching method to elucidate the elastic behaviour due to borate anomaly. Structural investigation of glass samples were carried out by X-ray diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopy while elastic properties were studied by measuring both longitudinal and shear velocities using pulse-echo method at 5MHz frequency. FTIR analysis revealed the presence of BO4 and BO3 vibration groups. Addition of SrO has resulted in increased ultrasonic velocities, elastic moduli (CL, μ, K and Y), hardness (H), Debye temperature (θD) for SrO content up to 30% but decreased for higher SrO addition. The fraction of the four coordinated boron atoms (N4) values, calculated from FTIR spectra increased for x≤30mol% followed by decrease at x>30mol%. Quantitative analysis of ultrasonic data using the bulk compression and ring deformation models showed reduction in the ratio of calculated bulk modulus to the experimental bulk modulus, Kbc/Ke for x≤30mol% indicating decreased ring deformation in borate anomaly region.
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