Preparation and studies of some thermal, mechanical and optical properties of 𝑥Al2O3(1 �?? �?)NaPO3 glass system

Bulletin of materials science

Rakesh Kumar²  K V Shah²  S Manikandan²  V Sudarsan¹  A Sarkar²  M Goswami²  V K Shrikhande²  G P Kothiyal²  B I Sharma² 

[1] Novel Materials and Structural Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India$$Novel Materials and Structural Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, IndiaNovel Materials and Structural Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India$$;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;    thermal expansion coefficient;    microhardness;    optical gap.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

Sodium aluminophosphate glasses having compositions of 𝑥Al₂O₃(1 â€�?? ð‘�?)NaPO₃ (ð‘�? = 0.05â€�??0.2) were prepared using conventional melt-quench technique. Density, glass transition temperature, microhardness (MH), thermal expansion coefficient (TEC) and transmission characteristics were measured as a function of alumina content for different samples. They were found to depend on O/P ratio with pronounced changes taking place for O/P ratio â‰�? 3.5. Density, glass transition temperature and microhardness were found to increase up to 15 mol% of alumina and then they showed a decreasing trend. Thermal expansion coefficient decreased continuously with alumina content. Optical gaps for different glass samples as measured from transmission characteristics were found to be in the range 3.13â€�??3.51 eV. It initially decreased with alumina content up to 15 mol% and then increased. The behaviour was explained on the basis of change in the average aluminum coordination number from six Al(6) to four Al(4) (i.e. Al(OP)₆/Al(OP)₄ ratio) along with the changes in polyhedra linkages in the glass network due to change in O/P ratio.

【 授权许可】

Unknown