Optical properties of 60B2O3â€�??(40â€�?�ð�?��?)PbOâ€�?�ð�?�¥MCl2 and 50B2O3â€�??(50â€�?�ð�?��?) PbOâ€�?�ð�?�¥MCl2 (M = Pb, Cd) glasses

[摘要] Optical absorption and transmittance spectra of 60B₂O₃â€�??(40â€�?�ð�?��?)PbOâ€�?�ð�?�¥MCl₂ and 50B₂O₃â€�??(50â€�?�ð�?��?) PbOâ€�?�ð�?�¥MCl₂ (M = Pb, Cd) (10 â‰�? ð‘�?â‰�? 20) glasses of varying composition were recorded in the UV-visible region. Various optical parameters such as optical energy gap (𝐸_opt), Urbach energy (𝐸_e), refractive index (ð‘�??₀), optical dielectric constant (ðœ�?_∝), and ratio of carrier concentration to the effective mass (ð‘�?/ð‘�?^*) were determined. The variation of optical energy gap with increase in the concentration of PbCl₂ or CdCl₂ is discussed.

[学科分类] 材料工程

[关键词] Borate glasses;optical energy gap;Urbach energy.