Raman spectroscopic study of structure of WO3La2O3B2O3 glasses with no color and crystallization of LaBWO6

► Structure and crystallization behavior of WO3La2O3B2O3 glasses are examined. ► The glasses are colorless and give the optical band gap energy of 3.49-3.61 eV. ► The coordination state of W6+ ions in the glasses is mainly isolated (WO4)2− tetrahedral units. ► LaBWO6 crystals are formed.