Structural and physical properties in the system ZnO–B 2O 3–P 2O 5–R nO m

Abstract

The glass forming region in the quaternary system ZnO–B 2O 3–P 2O 5–R n O m has been determined. Glass transition temperature ( T g), glass density ( ρ), thermal expansion coefficient ( α) and weight loss percentage ( W L) of these glasses were measured. The structure of (90− x− y)ZnO– xB 2O 3– yP 2O 5–10R n O m glass was characterized by infrared spectra (IR), Raman spectra and X-ray diffraction (XRD). Results of IR and Raman indicated that B 2O 3 participated in the glass network as a glass modifier and the IR band around 1440 cm −1 was ascribed to the v as(B–O–B) vibrations. Glass intensity increased with increase in B 2O 3 content. The disappearance of v s(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 B 2O 3: Zn 2P 2O 7 for 45ZnO– xB 2O 3–35P 2O 5–10R n O m glass, where x=0–20, and BPO 4 for 45ZnO– xB 2O 3–35P 2O 5–10R n O m glass, where x=30–40.