Structural, thermal, and DC conductivity properties of WO3–P2O5 glasses doped with B2O3

Abstract

AbstractIn this study, glasses in composition 70WO3–(30 − х)P2O5–хB2O3 (0 ≤ х ≤ 20 mol%) were prepared by melt quenching method. The glass formation, structure, and thermal and electrical properties are discussed. Homogeneous glasses were obtained at x = 0–10 mol% B2O3, whereas glasses with x = 15 and 20 contain microinclusions of WO3. The glass transition temperature decreases from 709 to 531.6°C with increasing B2O3 content, as well as the crystallization temperature and the thermal stability. The structure of the glasses was studied by Raman spectroscopy and infrared spectroscopy. The Raman spectra are characterized by a band near 995 cm−1, a broad band at 788–800 cm−1, and a band near 675 cm−1 ascribed to vibrations of W–O–P, W–O–W, and P–O–B bonds, respectively. The Fourier‐transform infrared spectra show vibrational bands due to characteristic phosphate and borate groups. Tetrahedral BO4 units prevail in the structural network. The electrical conductivity of the glasses decreased with x content due to the growth of WO3‐deficient regions.