| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1480310 | Journal of Non-Crystalline Solids | 2016 | 9 Pages |
•Borate anomaly in doped borate glass was investigated by elastic characterization.•BO4 formation strengthened the glass network at lower concentrations of SrO.•Higher NBO formation at higher SrO concentration weaken the glass structure.•Ring deformation decreased within borate anomaly region due BO4 formation.
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 5 MHz 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 ≤ 30 mol% followed by decrease at x > 30 mol%. 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 ≤ 30 mol% indicating decreased ring deformation in borate anomaly region.
