Effect of B2O3 addition on microhardness and structural features of 40Na2Oâ€�??10BaOâ€�?�ð�?�¥B2O3â€�??(50â€�?�ð�?��?)P2O5 glass system

Bulletin of materials science

K V Shah²  S Manikandan²  A Sarkar²  M Goswami²  V K Shrikhande²  G P Kothiyal²  M N Deo¹ 

[1] Synchrotron Radiation Section, Bhabha Atomic Research Centre, Mumbai 400 085, India$$Synchrotron Radiation Section, Bhabha Atomic Research Centre, Mumbai 400 085, IndiaSynchrotron Radiation Section, Bhabha Atomic Research Centre, Mumbai 400 085, India$$;Technical Physics and Prototype Engineering Division, Bhabha Atomic Research Centre, Mumbai 400 085, India$$Technical Physics and Prototype Engineering Division, Bhabha Atomic Research Centre, Mumbai 400 085, IndiaTechnical Physics and Prototype Engineering Division, Bhabha Atomic Research Centre, Mumbai 400 085, India$$

关键词: Phosphate glass;    microhardness;    FTIR;    MAS NMR.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

Phosphate glasses having composition, 40Na₂Oâ€�??10BaOâ€�?�ð�?�¥B₂O₃â€�??(50â€�?�ð�?��?)P₂O₅, where ð‘�? = 0â€�??20 mol% were prepared using conventional melt quench technique. Density of these glasses was measured using Archimedes principle. Microhardness (MH) was measured by Vicker’s indentation technique. Structural studies were carried out using IR spectroscopy and ³¹P and ¹¹B MAS NMR. Density was found to vary between 2.62 and 2.77 g/cc. MH was found to increase with the increase in boron content. ³¹P MAS NMR spectra showed the presence of middle ð‘�??² groups and end ð‘�??¹ and ð‘�??⁰ groups with Pâ€�?�Oâ€�?�B linkages. FTIR studies showed the presence of BO₃ and BO₄ structural units along with the depolymerization of phosphate chains in conformity with ³¹P MAS NMR. ¹¹B NMR spectra showed increase in BO₄ structural units with increasing boron content. The increase in MH with B₂O₃ content is due to the increase of Pâ€�?�Oâ€�?�B linkages and BO₄ structural units as observed from MAS NMR studies resulting in a more rigid borophosphate glass networks.

【 授权许可】

Unknown