DSC and FTIR Studies in Potassium, Strontium Doped Boro-Phosphate Glasses

Abstract

A series of five samples of boro-phosphate glasses doped with K₂O and SrO within the composition of 20(B₂O₃) + 30(P₂O₅) + x (SrO) + (50-x) (K₂O) where x = 10, 20, 30, 40 and 50 were prepared by the melt quench technique. The samples were annealed to remove if any thermal strains present. The Non-crystalline nature of the glass samples was confirmed by XRD studies. The Samples were DSC studied in the temperature range from 423K to 673K and glass transition temperature was determined. T_g various nonlinearly with SrO mole fraction.  FTIR study shows the existence of different structural groups such as BPO₄, BO₃ and BO₄ units in the network. Borophosphate glasses containing SrO and K₂O which exhibits different IR bands related to SrO structural units. In the FTIR studies the increase in number of NBO’s were observed in the structure of the present glass composites with increase of SrO up to 30 mole fraction and further increase of SrO the number of NBO’s decreased. Number of NBO’s and glass transition temperature with mole fraction of alkaline earth ions termed as mixed cationic effect. This is for the first time the boro phosphate glasses doped with K_2­O and SrO reported for dc electrical transport and structural studies.

Keywords: Borophosphate glasses, K2O, SrO, NBO’s, etc.

DOI: 10.7176/CMR/12-2-01

Publication date: February 29^th 2020