Preparation and properties characterization of P2O5-KNO3-K2O glass

Abstract

A series of glass based on 50P2O5-xKNO3-(50-x) K2O system where 0 < x £ 50 mol % has successfully been prepared using melt-quenched technique. The glass crystallinity has been confirmed using X-Ray Diffraction (XRD) analysis while the microhardness is measured using Vickers indenter. It is found that the microhardness is in the range of 146 Hv to178 Hv as the mol % of KNO3 content increases. The glass density, which is measured using the digital balance, is found to be in the range of 2.3820 gcm-3 to 2.4232 gcm-3 as the mol % of KNO3 content increases. The molecular bond structures and the characteristic of H-OH molecular vibrations in the glass are investigated using Infrared absorption spectrometer in the range of 370 cm-1 to 3800 cm-1. It has been found that the nitrogen incorporated into the glass network by replacing the bridging oxygen. It is also found out that the increase in the mol % of KNO3 content will cause the corrosion rate of the glass in pH 1, pH 3, pH 5 and pH 7 solutions to fall from 5.83 x 10-3 gcm-2min-1 to 0.25 x 10-3 gcm-2min-1. All of the solutions experience the increase in pH value after the 20 minutes corrosion test.