Structural and physical properties in the system ZnO-B2O3-P2O5-RnOm

The glass forming region in the quaternary system ZnO-B2O3-P2O5-RnOm has been determined. Glass transition temperature (Tg), glass density (ρ), thermal expansion coefficient (α) and weight loss percentage (WL) of these glasses were measured. The structure of (90−x−y)ZnO-xB2O3-yP2O5-10RnOm glass was characterized by infrared spectra (IR), Raman spectra and X-ray diffraction (XRD). Results of IR and Raman indicated that B2O3 participated in the glass network as a glass modifier and the IR band around 1440 cm−1 was ascribed to the vas(B-O-B) vibrations. Glass intensity increased with increase in B2O3 content. The disappearance of vs(P-O-P) vibration around 760 cm−1 indicated that P-O-B linkage was formed. XRD results revealed that the major crystalline phase changes with substitution of different amounts of B2O3: Zn2P2O7 for 45ZnO-xB2O3-35P2O5-10RnOm glass, where x=0-20, and BPO4 for 45ZnO-xB2O3-35P2O5-10RnOm glass, where x=30-40.