Abstract
A series of five samples of boro-phosphate glasses doped with K 2 O and SrO within the composition of 20(B 2 O 3 ) + 30(P 2 O 5 ) + x (SrO) + (50-x) (K 2 O) 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 BPO 4 , BO 3 and BO 4 units in the network. Borophosphate glasses containing SrO and K 2 O 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 2 O 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
Highlights
Glassy electrolytes characterized as amorphous structures are widely used for solid state ionic devices such as lithium ion batteries, sensors, fuel cells, electro chromic displays and in high energy density batteries etc
Because of the availability of DSC for limited amount of time, variation of glass transition temperature versus mole fractions of Strontium oxide (SrO) content is shown in figure 2
5 Conclusion A set of borophosphate glasses incorporated with SrO and K2O have been prepared and has been characterized through XRD, FTIR and DSC studies
Summary
Glassy electrolytes characterized as amorphous structures are widely used for solid state ionic devices such as lithium ion batteries, sensors, fuel cells, electro chromic displays and in high energy density batteries etc. Researchers reported mixed cation effect in ionic diffusivity as well as in the glass transition temperature in a glass system xNa2O-(1-x) CaO-SiO2 and xK2O-(1-x) BaO-SiO2 [11]. There were not many reports in the literature on density, molar volume, dc electrical conductivity, FTIR and DSC studies on boro-phosphate glasses doped with K2O and SrO. The experimental results on XRD studies, room temperature density, molar volume, temperature dependent dc conductivity, high temperature activation energy, FTIR and DSC studies on borophosphate glass systems doped with K2O and SrO in the composition range 20(B2O3) + 30(P2O5) + x (SrO) + (50x) (K2O) where x = 10, 20,30, 40 and 50 are presented. In oxide glasses mobile cationic concentration (N) has been evaluated using density values and the following equation, N=2[(ρmAlkali/MAlkali)NA]
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